About This Key

The material below has been derived from various fish identification texts.

 

 

Key to Identifying the Fish Families of the Sabine River Drainage Basin

1a.  Jawless, mouth disc shaped; 7 pairs of external gill openings; paired fins absent; single nostril positioned medially………….Petromyzontidae

1b.  Mouth with jaws; paired fins present; one gill opening on each side of head; one or two gill openings on each side of head………………….2

 

2a.  Caudal fin either heterocercal or abbreviated heterocercal…………………………...……......................................................................…3

2b.  Caudal fin homocercal………………………………………………………………....................................................................…..……6

 

3a.  Caudal fin heterocercal; body appears scaleless……………………………......................................................................…Polyodontidae

3b.  Caudal fin abbreviated heterocercal; body covered with ganoid or cycloid scales……..…........................................................................…4

 

4a.  Body covered with ganoid scales; snout formed into a beak; no gular plate..........................................................................…Lepisosteidae

4b.  Body covered with cycloid scales; snout not beak shaped; gular plate present……...........................................................................Amiidae

 

5a.  Adipose fin present…………………………………………………………………….…...................................................................…..6

5b.  Adipose fin absent…………………………………………………………………………...................................................................…7

 

6a.  Scales on body; no barbels on head………………………………...….……....................................................................……Salmonidae

6b.  Body scaleless; barbels on head…………………………………………...….......................................................................….Ictaluridae

 

7a.  Head without scales; One dorsal fin; pelvic fins without spines…………………….........................................................................………..8

7b.  Head partially scaled; one or two dorsal fins; pelvic fins with spines…………...…….........................................................................…….10

 

8a.  Anal fin with 17 or more rays……………………………………………..….....................................................................…….Clupeidae

8b.  Anal fin with fewer than 13 rays……………………………………………….......................................................................……………9

 

9a.  Inferior, fleshy mouth modified for sucking; more than 7 pharyngeal teeth in main row; usually 10 or more dorsal fin rays…...…Catostomidae

9b.  Mouth usually not modified for sucking; fewer than 7 pharyngeal teeth in main row; usually 10 or fewer dorsal fin rays……….......Cyprinidae

 

10a.  Jaws duckbilled……………………………………………………………..................................................................………..Esocidae

10b.  Jaws not duckbilled……………………………………………………………………...................................................................…..11

 

11a.  Anal fin without spines; one dorsal fin……………………………………...……………........................................................................12

11b.  Anal fin with 1-7 spines; 1-2 dorsal fins………………………………………...……......................................................................…...14

 

12a.  Dorsal fin origin behind anal fin origin; males with a pointed anal fin forming a gonopodium……………………………………...Poeciliidae

12b.  Dorsal fin origin above or anterior to anal fin origin; no gonopodium present on males................................................................................13

 

13a.  Body short and robust……………………………………………......................................................................………Cyprinodontidae

13b.  Body long…………………………………………………………………......................................................................…...Fundulidae

 

14a.  Anus anterior to pelvic fins (adults); more than 5 soft rays on each pelvic fin……………………………………………...Aphredoderidae

14b.  Anus posterior to pelvic fins; five soft rays on pelvic fins………………………………...........................................................................15

 

15a.  Pelvic fin position abdominal or subthoracic; dorsal fins widely separated………….........................................................................…….16

15b.  Pelvic fin position thoracic; dorsal fins joined, or if separate closely adjacent to each other………………………………………….....…17

 

 

16a.  Dorsal fin with 4 thick spines; anal fin with 2-3 spines; adipose eyelids present.............................................................................Mugilidae

16b.  Dorsal fin with 4-8 thin spines; anal fin with 1 spine; adipose eyelids absent………………………………………………..Atherinopsidae

 

17a.  Dorsal fin with more than 23 rays; lateral line extends to tip of caudal fin…….............................................................................Sciaenidae

17b.  Dorsal fin with fewer than 23 rays; lateral line, if present, does not extend to tip of caudal fin………………………………………...…..18

 

18a.  Anal fin with 1-2 spines…………………………………………………...............................................................................…..Percidae

18b.  Anal fin with 3-8 spines………………………………………………………...................................................................……………19

 

19a.  Posterior margin of operculum with a sharp spine; spiny and soft dorsal fin separate or only slightly connected; pseudobranchium present and exposed………………….…...........................................................................................................................................................Moronidae

19b.  Posterior margin of operculum without a sharp spine; spiny and soft dorsal fins connected or with deep notch; pseudobranchium covered or absent………………………………..……................................................................................................................................................…20

 

20a.  Lateral line complete or incomplete; adults much longer than 1.5 in (38.1 mm); scales ctenoid…………………………....…Centrarchidae

20b.  Lateral line absent; adults usually less than 1.5 in (38.1 mm); scales cycloid………………………………....…….………..Elassomatidae

 

 

 

Key to Petromyzontidae of the Sabine River Basin

1a.  Sucking disc wider than head; teeth in sucking disc well developed…………………………............................….Ichthyomyzon castaneus

1b.  Sucking disc not wider than head; teeth in posterior (or entire) field of sucking disc poorly developed.......……..………Ichthyomyzon gagei

 

 

Key to Polyodontidae of the Sabine River Basin

Polyodon spathula

 

 

Key to Lepisosteidae of the Sabine River Basin

1a.  Snout short and broad, least width of snout goes about 5-7 times into snout length……...........................................................................…..2

1b.  Snout long and narrow, least width of snout goes about 12 times into snout length……………......…………………......Lepisosteus osseus

 

2a.  Notable spots on top of head and snout; distance from tip of snout to corner of mouth longer than rest of head; one row of canine teeth in upper jaw………………...........................................................................................................................................…...Lepisosteus oculatus

2b.  No notable spots on top of head and snout; distance from tip of snout to corner of mouth shorter than rest of head; two rows of canine teeth in upper jaw…...…….........................................................................................................................................................Atractosteus spathula

 

 

Key to Identifying Amiidae of the Sabine River Basin

 Amia calva

 

 

Key to Identifying Clupeidae of the Sabine River Basin

 

1a.  Last dorsal fin ray elongated; dark spot on body just behind preopercle………………........................................................................…….2

1b.  Last dorsal fin ray not elongated; no dark spot behind preopercle……...........................................................................Alosa chrysochloris

 

2a.  Mouth position terminal; black spot behind opercle is about the same size or smaller than pupil of eye……………....…Dorosoma petenense

2b.  Mouth position subterminal or inferior; black spot behind opercle is larger than pupil of eye…………………………Dorosoma cepedianum

 

 

Key to Identifying Cyprinidae of the Sabine River Basin

 

1a.  More than 15 soft rays on dorsal fin; dorsal and anal fins each with a long spine-like serrated ray………………….……….......………...…2

1b.  Fewer than 11 soft rays on dorsal fin; dorsal and anal fin without long spine-like serrated ray…….………………………………………....3

 

2a.  Upper jaw with two pairs of barbels; pharyngeal teeth molar-like and in three rows 1,1,3-3,1,1 or 1,2,3-3,2,1…………….Cyprinus carpio

2b. Upper jaw without barbels; main row of pharyngeal teeth 4-4……........................................................................………Carassius auratus

 

3a.  Main row of pharyngeal teeth comb-like with notable grooves; anal fin set back, length from anal fin origin to end of caudal peduncle goes 3 or more times into distance of snout to anal fin origin…………………………………………………………......…….Ctenopharyngodon idella

3b.  Main row of pharyngeal teeth without notable grooves; length from anal fin origin to end of caudal peduncle goes less than 2.5 times into distance of snout to anal fin origin…………….................................................................................................................................................…4

 

4a.  Lower jaw with notable ridge of cartilage separated from lower lip by definite groove; intestine wound sprirally around air bladder……………….................................................................................................................................................................................Campostoma anomalum

4b.  Lower jaw without ridge of cartilage; intestine not wound spirally around air bladder…...........................................................................…...5

 

5a.  Predorsal scales crowded, smaller than other scales on the body……………………......................................................................…….…6

5b.  Predorsal scales not crowded………………………………………………………………...................................................................…7

 

6a. Small, dark caudal spot separated from mid lateral band by a clear space (mid lateral band may not be notable);  intestine short…………………………………….…...................................................................................................................................................…Pimephales vigilax

6b.  Caudal spot and mid-lateral band diffuse, caudal spot not separated by clear space; intestine long, at least twice the standard length……………………………….…....................................................................................................................................................Pimephales promelas

 

7a.  Intestine long, at least two times the standard length……………………………...…........................................................................………8

7b.  Intestine short, less than two times standard length…………………………………........................................................................……….9

 

8a.  Mouth position oblique and nearly terminal; tip of upper lip on level with middle of eye……..............................................Hybognathus hayi

8b.  Mouth position horizontal and nearly subterminal; tip of upper lip on level with lower margin of eye…………...……..Hybognathus nuchalis

 

9a.  Dark pigmentation outlines large diamond shaped scales (taller than wide) on dorsal and lateral regions; caudal spot, if present, at least as big as eye………………………………...............................................................................................................................................................…10

9b.  Scales outlined by dark pigmentation not diamond shaped (taller than wide); caudal spot, if present, smaller than eye………………………11

 

10a.  Large caudal spot present; pharyngeal teeth 1,4-4,1 or 2,4-4,2…….....................................................................…...Cyprinella venusta

10b.  No caudal spot; pharyngeal teeth 0,4-4,0………………………….....................................................................…...Cyprinella lutrensis

 

11a.  Barbels present (1-2 pairs), may be concealed in groove above upper jaw near the corner of the mouth ………………………...……....12

11b.  Barbels absent………………………………..................................................................…………………………………...…………13

 

12a.   Terminal mouth position……………………………..……..…....................................................................….Semotilus atromaculatus

12b.  Subterminal or inferior mouth position………………………........................................................................……Macrhybopsis hyostoma

 

13a.  Lateral line greatly decurved (curving downward), almost reaching belly………………............................................................................14

13b.  Lateral line slightly decurved, or straight, or with a broad arch…………..……………........................................................................….15

 

14a.  Abdomen behind pelvic fins with a fleshy keel; pharyngeal teeth 0,4-4,0 or 0,5-5,0; gillrakers long and slender, 17-19 on first gill arch; eyes and median fins usually yellow-green………………………………………………………………....................……Notimigonus crysoleucas

14b.  No notable keel (covered by scales); pharyngeal teeth 3,5-5,2 or 2,5-5,2; gillrakers short and stout, 9-10 on first gill arch; eyes and median fins usually red......................................................................................................................................................Scardinius erythrophthalmus

 

15a.  Dorsal fin origin behind pelvic fin insertion………………………........................................................................…………………….....16

15b.  Dorsal fin origin in line or just in front of pelvic fin insertion……………............................................................................……………….17

 

16a.  Dark blotch of pigmentation at origin of dorsal fin; dorso-lateral region with chevron markings……………..………..Lythrurus umbratilis

16b.  No dark blotch of pigmentation at origin of dorsal fin; no chevron markings on dorso-lateral region……………......…....Lythrurus fumeus

 

17a.  Underside of head flat; front of upper lip below lower margin of eye………………............................................................................…..18

17b.  Underside of head not flat; front of upper lip above lower margin of eye……………............................................................................…19

 

18a.  Lower lip fleshy, forms lobes at each corner of mouth…….................................................................................….Phenacobius mirabilis

18b.  Lower lip thin, does not form lobes at each corner of mouth…………..........................................................................…Notropis sabinae

 

19a.  First few lateral line scales elevated (taller than wide), height 2-5 times the width……...........................................................................….20

19b.  First few lateral line scales not elevated……………………………………...………......................................................................……21

 

20a.  Pigmentation outlining scales is faint, most notable on mid-dorsal region; pelvic fins, when folded down, just reach to or go beyond origin of anal fin; lining of body cavity with faint speckles………………………………………………………….......…..……..….Notropis buchanani

20b.  Pigmentation outlining scales is notable, becoming faint below lateral line;  pelvic fins, when folded down, do not reach origin of anal fin; lining of body cavity with dark speckles………………………………………………………………...........................…….…Notropis volucellus

 

21a.  Mouth small, not extending to front of eye…………………………………………......................................................................…......22

21b.  Mouth large, extending to or just beyond front of eye……………………………….......................................................................….....23

 

22a.  Mouth upturned, nearly vertical…………………………………....................................................................……...Opsopoedus emiliae

22b.  Mouth horizontal, snout overhanging upper lip……………………...….......................................................................…..Hybopsis amnis

 

23a.   Dark mid-lateral band running from tip of jaws or snout to caudal peduncle, may run onto caudal fin or end just before a small caudal spot…………...………………………………….................................................................................................................................................…24

23b.  No notable mid-lateral band…………………....................................................................……………………….....Notropis shumardi

 

24a.  Dark mid-lateral band begins at upper and lower jaw; mid-lateral band may be faint on some specimens……………………...……........25

24b.  Dark mid-lateral band begins at tip of snout just above the upper jaw………………………………………....…...Notropis atrocaudalis

 

25a.  Dorsal fin with a black dash; large caudal spot with two smaller triangle shaped blotches above and below……...…....Notropis maculatus

25b.  No black dash on dorsal fin; no large caudal spot with two smaller triangle shaped blotches above and below…….....Notropis chalybaeus

 

 

Key to Catostomidae of the Sabine River Basin

1a.  Dorsal fin base long, more than 1/3 standard length; dorsal fin rays 22-30……………........................................................................…….2

1b.  Dorsal fin base short, less than 1/4 standard length; dorsal fin rays 4-18………………........................................................................……3

 

2a.  Body long and slender, more than 50 lateral line scales; snout long, length greater than distance from back of eye to end of opercle………………………………...........................................................................................................................................................…Cycleptus elongatus

2b.  Body deep, less than 45 lateral line scales; snout short, length less than distance from back of eye to end of opercle………………………………………………………………………...….4

 

3a.  Lower lobe of caudal fin with a thick black streak……………........................................................................……Moxostoma poecilurum

3b.  Lower lobe of caudal fin without a thick black streak…………………………………......................................................................……..7

 

4a.  Subopercle triangle shaped…………………………………………….…...................................................................…Carpoides carpio

4b.  Subopercle half-circle shaped…………………………………………………...................................................................……..……….5

 

5a.  Mouth terminal and oblique; tip of upper lip on level or almost on level with lower margin of the eye………………...…Ictiobus cyprinellus

5b.  Mouth inferior; tip of upper lip well below lower margin of the eye………………...…….........................................................................…6

 

6a.  Body elongate and thick, greatest body depth goes 2.6 - 3.3 times into standard length; head width goes fewer than 5 times into standard length; nape rounded or weakly keeled......................................................................................................................................... Ictiobus niger

6b.  Body deep and thin, greatest body depth goes 2.2 - 2.8 times into standard length; head width goes more than 5 times into standard length; nape usually keeled.………......................................................................................................................................................Ictiobus bubalus

 

7a.  Lateral line mostly complete; each scale with dark spot forming rows of dots along body (young with a mottled pattern)……………………………………….…........................................................................................................................................................…Minytrema melanops

7b.  Lateral line absent; no rows of spots along body…………………………………….........................................................................……..8

 

8a.  Eye large, goes 2 or more times into head length; lateral scale rows 36-38…………………..............................................Erimyzon sucetta

8b.  Eye small, goes more than 2 times into snout length; lateral scale rows 39-41……………..........................................….Erimyzon oblongus

 

 

Key to the Ictaluridae of the Sabine River Basin

1a.  Caudal fin slightly emarginate or flat or rounded…………………………………………............................................................................2

1b.  Caudal fin forked…………………………………………………………………………….....................................................................3

 

2a.  Adipose fin joined with caudal fin……………………………………………………..….....................................................................…..4

2b.  Adipose fin free from caudal fin………………………………………………...………….....................................................................…5

 

3a.  Posterior margin of anal fin straight edged; body humpbacked at dorsal region; lateral region without scattered dark spots………………………………………………….............................................................................................................................................….Ictalurus furcatus

3b.  Posterior margin of anal fin rounded; body not humpbacked; lateral region with scattered dark spots……………….….Ictalurus punctatus

 

4a.  Mouth subterminal, upper jaw overhangs lower jaw; pectoral spines serrated………………..........................................Noturus nocturnus

4b.  Mouth terminal, upper jaw equal with lower jaw; pectoral spines not serrated………………..............................................Noturus gyrinus

 

5a.  Head dorsally compressed (flat); toothpad in top of jaw with backward extensions on each side………………………...Pylodictus olivaris

5b.  Head not dorsally compressed; no extensions of toothpad in top of jaw………….......................................................................………….6

 

6a.  Chin barbels darker than coloration of chin; anal rays 17-23………….…......................................................................….Ameiurus melas

6b.  Chin barbels same color as chin or lighter; anal fin rays 24-27………................................................................................Ameiurus natalis

 

 

Key to Esocidae of the Sabine River Basin

1a.  Snout long, distance from middle of eye to tip of snout greater than distance from middle of  eye to posterior margin of opercle; suborbital bar is vertical; branchiostegal rays 11-13…………......................................................................................................................................Esox niger

1b.  Snout short, distance from middle of eye to tip of snout equal or slightly less than distance from center of eye to posterior margin of opercle; suborbital bar slanted backwards……………..........................................................................................................................Esox americanus

 

 

Key to Salmonidae of the Sabine River Basin

Onchorynchus mykiss

 

 

Key to Apredoderidae of the Sabine River Basin

Aphredoderus sayanus

 

 

Key to Mugiliadae of the Sabine River Basin

1a.  Lower jaw round; adipose eyelid absent; lower limb of first gill arch with 17-21 rakers……...................................Agonostomus monticola

1b.  Lower jaw angled; adipose eyelid present; lower limb of first gill arch with 25-60 rakers…...........................................................................2

 

2a.  Lateral region with dark horizontal stripes; second dorsal and anal fins with a few scales covering anterior rays………….….Mugil cephalus

2b.  Lateral region without dark horizontal stripes; second dorsal and anal fins covered with scales……………………...…....…..Mugil curema

 

 

Key to Atherinopsidae of the Sabine River Basin

1a.  Four rows of spots running along dorsal region…………………….........................................................................…..Membras martinica

1b.  Dorsal region with scales outlined by pigment producing a crosshatched pattern…………............................................................................2

 

2a.  Snout, when viewed from above is beaklike; dorsal scales crowded….........................................................................Labidesthes sicculus

2b.  Snout, when viewed from above is rounded; dorsal scales large……….........................................................................…Menidia berylina

  

 

Key to the Fundulidae of the Sabine River Basin

1a.  Body short, 30 or fewer longitudinal scale rows………………………..….....................................................................…..Lucania parva

1b.  Body long, more than 30 longitudinal scale rows………………………………......................................................................……...…….2

 

2a.  Body with dark mid-lateral band running from snout to caudal fin, may run onto tail…..............................................................................….3

2b.  Body without dark mid-lateral band……………………………………...……………....................................................................……..4

 

3a.  Rows of spots above mid-lateral band, spots are as dark or darker than the band……………………………………..Fundulus olivaceus

3b..No rows of spots present, if present not as dark as mid-lateral band…….....................................................................….Fundulus notatus

 

4a.  Suborbital bar present, may be faint on live specimens; more than two rows of red or brown spots along lateral region…...Fundulus blairae

4b.  Suborbital bar absent; spots if present do not form more than two horizontal rows…..........................................................................……..5

 

5a.  Dorsal fin origin posterior to anal fin origin……………………...........................................................................……..Fundulus chrysotus

5b.  Dorsal fin origin anterior or in-line with anal fin origin…………………………............................................................................……….…6

 

6a.  Predorsal stripe does not reach occiput or is absent; first gill arch with 9-12 gill rakers………………………………..…Fundulus grandis

6b.  Predorsal stripe present and reaches to occiput; first gill arch with 5-7 gill rakers……………………………………...Fundulus pulverous

 

 

Key to the Poeciliidae of the Sabine River Basin

1a.  Origin of dorsal fin posterior of anal fin origin……………………………………...……........................................................................….2

1b.  Origin of dorsal fin anterior of anal fin origin………………………........................................................................……..Poecilia latipinna

 

2a.  Dark midlateral band present; dark spot on dorsal and caudal fin base..........................................................................Heterandria formosa

2b.  No dark midlateral band; no dark spot on dorsal or caudal fin base……............................................................................Gambusia affinis

 

 

Key to Cyprinodontidae of the Sabine River Basin

Cyprinodon variegatus

 

 

Key to the Moronidae of the Sabine River Basin

1a.  Tooth patch(s) on tongue present; second anal fin spine shorter than third anal fin spine….............................................................................2

1b.  No tooth patch present; second and third anal fin spine about equal in length………………...................................Morone mississippiensis

 

2a.  Body deep, body depth goes less than three times into standard length; one tooth patch on back of tongue; dark stripes on lateral region broken up…..…………...........................................................................................................................................…...……Morone chrysops

2b.  Body slender, body depth goes more than three times into standard length; two tooth patches on back of tongue; dark stripes on lateral region not noticeably broken up….................................................................................................................................................…..Morone saxatilis

 

 

Key to Centrarchidae of the Sabine River Basin

1a.  Three anal spines, may have 2 or 4………………………………………………….......................................................................………2

1b.  Five or more anal spines……………………………………………………………......................................................................……….3

 

2a.  Body slender, body depth goes into standard length more than 3 times………………........................................................................……..5

2b.  Body deep, body depth goes into standard length less than three times………………..........................................................................……6

 

3a.  Dorsal fin spines 11-13………………………………………..................................................................…….Centrarchus macropterus

3b.  Dorsal fin spines 6-8………………………………………...…....................................................................…………………………….4

 

4a.  Distance from dorsal fin origin to posterior margin of eye greater than dorsal fin base length; pigmentation on lateral region forms dark vertical bars……………………..................................................................................................................................................…Pomoxis annularis

4b.  Distance from dorsal fin origin to posterior margin of eye equal or less than dorsal fin base length; pigmentation on lateral region forms scattered dark spots…..........................................................................................................................................................…Pomoxis nigromaculatus

 

5a.  Tooth patch present on tongue; Upper jaw extends to or just past eye (adults > 150mm); lower lateral region with horizontal rows of spots; young with three colored caudal fin…………………………………………………………..................……………Micropterus punctulatus

5b.  No tooth patch present on tongue; upper jaw extends well past eye (adults > 150mm); lower lateral region without horizontal rows of spots; young with a two colored caudal fin……………………………………………………………...............…………..…Micropterus salmoides

 

6a.  Tooth patch on tongue; 3-5 dark bars extending from back of eye……......................................................................……Lepomis gulosus

6b.  No tooth patch on tongue; no dark bars extending from back of eye………………......................................................................….……..7

 

7a.  Opercle flap inflexible (excluding opercle membrane)…………………………………........................................................................…....8

7b.  Opercle flap flexible………………………………………………………………....................................................................……...…10

 

8a.  Snout long, snout length going less than 2 times into opercle length…............................................................................…Lepomis cyanellus

8b.  Snout short, snout length going 2 times or more into opercle length…………............................................................................……………9

 

9a.  Lateral line incomplete………………………………………………....................................................................…Lepomis symmetricus

9b.  Lateral line complete…………………………………………………...................................................................….…Lepomis miniatus

 

10a.  Pectoral fin long, when bent forward and pressed flat tip extends well beyond front of eye...................................................................................................................................................................................................................11

10b.  Pectoral fin short, when bent forward and pressed flat tip does not extend well past front of eye……………………………………..…..13

 

11a.  Dorsal fin with dark blotch near base of last few rays; opercle flap dark to margin…………….............…………....Lepomis macrochirus

11b.  Dorsal fin without dark blotch, opercle flap with light colored margin…………...…….........................................................................…12

 

12a.  Posterior margin of opercle flap red or orange (white when preserved); gill rakers on first arch short and stubby; lateral region without notable orange or brown spots…………......................................................................................................................................Lepomis microlophus

12b.  Posterior margin of opercle flap white; gill rakers on first gill arch long and slender; lateral region with notable orange or brown spots…………………………………................................................................................................................................................……Lepomis humilis

 

13a.  Opercle flap with a thin light colored margin…………….......................................................................………………………..……….14

13b.  Opercle flap without a thin light colored margin…………………….......................................................................…...…Lepomis auritus

 

14a.  Cheeks with 5-7 scale rows; pectoral fins with 13-15 rays; Aside from light colored margin, opercle flap dark; lateral line without red scales ……………….............................................................................................................................................………....……Lepomis megalotis

14b.  Cheeks with 3-4 scale rows; pectoral fins with 12 rays (rarely 13); along with light colored margin, dark opercle may have white or silver spots; lateral line with red scales (red scales appear yellow on preserved specimens)……………………………….……..Lepomis marginatus

 

 

Key to the Percidae of the Sabine River Basin

1a.  Canine teeth present; preopercle strongly serrated……………………….….....................................................................…Sander vitreus

1b.  Canine teeth absent; preopercle weakly serrated or not serrated……………….....................................................................……………..2

 

2a.  Body slender, body depth contained in standard length more than 7 times; belly without scales………………………………………..……3

2b.  Body deep, body depth contained in standard length less than 7 times; belly scaled….........................................................................…......4

 

3a.  Opercle spine long and thin; length much greater than width at base; mid-lateral region with a single row of dashes (may be joined or absent)…………………...……….................................................................................................................................................….Ammocrypta clara

3b.  Opercle spine short, length about equal to width at base; mid-lateral region with a row of blotches………………...……Ammocrypta vivax

 

4a.  Snout conical or pointed, extends beyond upper lip; body with 15-20 dark vertical bars……………………………...Percina macrolepida

4b.  Snout does not extend beyond upper lip; lateral region with dark blotches, if barred, less than 15 bars…………………………………...…5

 

5a..Mid-lateral region with a series of large dark blotches, may be connected; midline of belly with a row of enlarged scales or naked………..…6

5b.  Mid-lateral region without blotches; scales on belly not enlarged…………........................................................................……………...…7

 

6a.  Dark blotch at anterior and posterior portion of first dorsal fin; no caudal spot present…………………………………...Percina shumardi

6b.  Dark blotch at posterior portion of first dorsal fin may be present; vertical row of three spots on caudal fin base, bottom two spots connected………………………...............................................................................................................................…………..Percina sciera

 

7a.  Body slender, body depth contained in standard length more than five times; lateral region with a series of dark“M” shaped markings………………………….........................................................................................................................................................Etheostoma chlorosomum

7b.  Body deep, body depth contained in standard length less than five times; lateral region without series of dark “M” shaped markings……………………………………..........................................................................................................................................................………………8

 

8a.  Pectoral fin length longer than head length; two large brown spots on caudal fin base……………..…………………….Etheostoma histrio

8b.  Pectoral fin length equal to or shorter than head length; no large spots on caudal fin base...........................................................................…9

 

9a.  Lateral line appears as a light colored streak………………………........................................................................Etheostoma parvipinne

9b.  Lateral line does not appear as a light colored streak on lateral region…………….......................................................................………..10

 

 

10a.  Lateral line short, fewer than six pored scales; mid-lateral region with single row of horizontal dashes…………...…..Etheostoma proeliare

10b.  Lateral line long, more than six pored scales; mid-lateral region without single row of horizontal dashes…………………………………..11

 

11a.  Lateral line arched, such that 3 rows of scales are between lateral line and base of first dorsal fin……………………...Etheostoma gracile

11b.  Lateral line straight with more than three rows of scales between lateral line and base of first dorsal fin…………………………………...12

 

12a.  Gill membranes widely joined; notable humeral sport (located just above base of pectoral fins)……………………....Etheostoma artesiae

12b.  Gill membranes separate; humeral spot faded or absent……….......................................................................……Etheostoma asprigene

 

 

 

Key to Sciaenidae of the Sabine River Basin

Aplodinotus grunniens

 

 

Key to Elassomatidae of the Sabine River Basin

Elassoma zonatum