Lucania parva
rainwater killifish
Type Locality
Beesley's point, New Jersey
(Baird and Girard in Baird 1855).
Etymology/Derivation of Scientific Name
Lucania: a coined name
without meaning; parva: small (Ross 2001).
Synonymy
Cyprinodon parvas
Baird and Girard in Baird 1855:345.
Lucania
venusta Evermann 1899:309.
Lucania
parva Cook 1959:159.
Characters
Maximum size: 62 mm
SL (Gunter 1950).
Coloration: Body not
barred (Hubbs et al. 1991). Back silvery to light green, with a narrow, dark
middorsal stripe. Scales on sides outlined in melanophores, creating
cross-hatched pattern, which is especially prominent in breeding males.
Forward and upper surfaces of the head speckled with melanophores, which
also extend onto the underside of the lower jaw. Belly and undersides of
body are silver. Fins generally lack pigmentation, except for some
melanophores along the rays. In breeding males, dorsal fin has a black
anterior blotch and dark marginal and basal bands that may include orange
pigmentation. Caudal, anal, and pelvic fins red to orange, with black
marginal bands (Gunter 1950; Simpson and Gunter 1956; Ross 2001).
Counts: 10+ dorsal fin
rays; 8-13 scale rows from pelvic origin to
isthmus; 30 or fewer longitudinal scale rows
(Hubbs et al. 1991); 27 (26-28) lateral scales; 11 (9-13) dorsal fin rays;
13 (12-14) pectoral fin rays; 6 (4-7) pelvic fin rays; 9 (8-13) anal fin
rays; 16 (15-18) caudal fin rays; 8 (5-9) gill rakers on 1st arch
(Sublette et al. 1990).
Body shape: Body
deep, rather compressed; head flattened above, tapering to vertically
rounded, blunt snout (Hardy 1978). Body depth contained four times in
standard length (Hubbs et al. 1991). Body axis straight (Sublette et al.
1990).
Mouth position:
Supraterminal, oblique; mouth small; obliquely sloped, protruding lower jaw
(Sublette et al. 1990).
External morphology:
Distance from origin of dorsal fin to end of hypural plate more than
distance from origin of dorsal fin to preopercle (Hubbs et al. 1991); dorsal
and caudal fins rounded; pectorals, pelvic, anal fins rounded at apex
(Sublette et al. 1990). Males develop
prickly contact organs on top and sides of head and on side of body between
dorsal and anal fin bases (Foster 1967; Collette 1977). Female with
membranous sheath surrounding genital opening (Sublette et al. 1990).
Internal morphology:
Teeth conical and simple (Hubbs et al. 1991). Premaxillary and mandibular
teeth uniserial or irregular, occasionally with a few strong inner teeth
(Sublette et al. 1990).
Distribution (Native and Introduced)
U.S. distribution:
Native to coastal waters from Massachusetts to Tampico, Mexico (Hubbs et al.
1991). Introduced into California, Nevada, Oregon, and Utah (Hubbs and
Miller 1965). Locally abundant in lower Pecos River drainage, New Mexico,
not ascending tributary streams far above mouth (Cowley and Sublette 1987).
Texas distribution:
Occurs in the Pecos River, Leon Creek, and in Falcon Reservoir in the Rio
Grande Basin; recently introduced (ca. 1980) into Clear Creek (Menard
County, San Saba River Drainage; Hubbs et al. 1991). Warren et al. (2000)
list the following drainage units for distribution of Lucania parva
in the state: Sabine Lake (including minor coastal drainages west to
Galveston Bay), Galveston Bay (including minor coastal drainages west to
mouth of Brazos River), Brazos River, Colorado River, San Antonio Bay
(including minor coastal drainages west of mouth of Colorado River to mouth
of Nueces River), Nueces River. Hubbs (1957) suggested that the species may
occupy most of the Tamaulipan Biotic Province.
Abundance/Conservation status (Federal, State, NGO)
Populations in southern
United States are currently stable (Warren et al. 2000). Usually abundant in
preferred habitat (Duggins 1980a).
Habitat Associations
Macrohabitat: Found in
salt marshes, bays, and lagoons from Cape Cod, Massachusetts to Tampico,
Mexico (Duggins 1980a); common in freshwaters of St. John’s River system,
Florida (Burgess 1977), and Rio Grande and Pecos River in Texas and New
Mexico (Duggins 1980a). Lucania parva is a schooling species (Hardy
1978).
Mesohabitat: Tolerates
wide range of salinity; invariably collected in presence of aquatic
vegetation (Duggins 1980a). Rhodes and Hubbs (1992) reported that species
was more abundant at all saline sample sites than at any of the freshwater
sampling sites on the Pecos River, Texas. Species seems to inhabit primarily
brackish water with salinities of 0.7-24.2 ppt throughout most of range
(Gunter 1950; Miller and Guillory 1980). Gunter (1950) reported species
avoidance of salt flats and bay shores, and preference for fresher waters in
ponds and sloughs of the Aransas Refuge, on the south Texas coast. In
Mississippi, species found in vegetated areas along lower, tidally
influenced sections of coastal rivers; in Old Fort Bayou, near Ocean
Springs, species was most common at sites with an average salinity of 4 ppt,
and less common at sites with either higher or lower values (Peterson and
Ross 1991). In the St. Johns River estuary, Florida, Jordan (2002) found
Lucania parva almost exclusively in structurally complex beds of
tapegrass (Vallisneria Americana); observations of fish, in the
laboratory, indicated species preference for vegetated over unvegetated
habitats in the absence of both potential prey and predators, and a further
increased utilization of vegetated habitats when predatory largemouth bass (Micropterus
salmoides) were added.
Biology
Spawning season: In
Texas, females began ripening in February, and a few were gravid in July;
peak spawning in May and June (males displayed breeding coloration from
February into June, or July, with greatest color intensity in May; Gunter
1950); may occur in earlier in the spring (Simpson and Gunter 1956).
Sublette et al. (1990) reports spawning in New Mexico from spring – fall, at
least in southern portion of state.
Spawning location:
During spawning, male and female swim into vegetation with fine leaves;
there eggs are released and fertilized; eggs have mucous threads with which
they are attached to plant material (Foster 1967). McLane (1955) noted that
male courtship behavior was observed near clumps of Naias and
Vallisneria.
Reproductive strategy:
A courting male swims in loops slightly below the female, waiting for the
female to respond by stopping; after a female stops, the male moves under
her flicking his head against her throat; pair moves slowly toward surface
of the water, while male continues to rub his head against underside of the
female; when they are near surface, female swims into vegetation having fine
leaves or algal masses, and the male follows; using his dorsal and anal
fins, the male then clasps female, and eggs are released and fertilized
(Foster 1967).
Fecundity: 7-46 ripe
ova (mean 24.5 per fish) plus numerous smaller ova (McLane 1955); maximum
reported count 104 (Hildebrand and Schroeder 1928; Hardy 1978). Freshly laid
eggs are spherical, nearly colorless, having chorionic threads; live eggs
averaging 1.23 mm in diameter; eggs hatch in 6 days at water temperature of
23.9 degrees C (Foster 1967). More than one brood may be produced per year
by a single female (Hardy 1978).
Age/Size at maturation:
3-5 months after hatching, at a minimum size of 25 mm TL (Hildebrand and
Schroeder 1928).
Migration: Mass
downriver migration of thousands of fish was noted in York River Virginia,
in mid-October, and inshore in Florida Keys only during October, November
and February (Hardy 1978). Species may be anadromous, moving into lower
salinity water for breeding, and returning to higher salinity water after
breeding (Foster 1967).
Longevity:
Food habits: After
hatching and spending about one week on the bottom until yolk sac is
absorbed, young fish move up into water column and begin to feed (Foster
1967). Simpson and Gunter (1956) and Harrington and Harrington (1961)
reported diet items including larval crustaceans (mainly cyclopoid and
harpacticoid copepods), mosquito larvae, small worms, and mollusks.
Harrington and Harrington (1961) noted that the species heavily predates
both larvae and pupae of saltmarsh mosquitoes.
Growth and Population
structure: Females larger than males (Hardy 1978); average difference in
size is about 6 mm (Hildebrand and Schroeder 1928). In Texas, Gunter (1950)
collected most fish in May, June, and July, with total length-frequency
curves indicating two groups, from 18-33 mm, and 43-53 mm in length; many
fish around 18 mm in length were collected in April and May, but the
majority of this group had disappeared through growth, and most of the
larger group was no longer present in July; crude mode during most months
was 23 mm in length, although in April and May most fish were from 17-25 mm
long, and the majority were from 21-30 mm long in June and July.
Phylogeny and morphologically similar fishes
Species shows considerable
variation (usually clinal) throughout range, but division into subspecies
probably not justified (Duggins 1980a); species displays no geographic
differences in morphology or isoenzymes (Duggins 1980b). Based on
morphological characters of Lucania parva from the Pecos River, Hubbs
and Miller (1965) suggest that the population may be representative of a
distinct race. Lucania parva superficially similar to mosquitofishes,
from which it differs in lacking the modified anal fin in males (gonopodium)
and in having the third anal ray branched in female; also, dorsal origin in
advance of the anal fin origin in rainwater killifishes (Ross 2001). Lack
of barring will distinguish L. parva from the other killifishes;
position of the dorsal, inserted before, instead of behind the front of the
anal fin, will distinguish L. parva from the livebearers (Koster
1957).
Host Record
Trematoda: Parascocotyle
diminuta (Hoffman 1967); trematode worms, Gyrodactylus (Tyler
1963).
Commercial or Environmental
Importance
In an effort to escape
predators, such as bluegills (Lepomis macrochirus), fish may jump
from the water onto surface of a lily pad when pursued, lying motionless for
up to ten seconds before reentering the water; however, the predator may
sometimes take the fish by biting through the lily pad (Baylis 1982).
Able (1976) noted that Lucania parva will remove
external parasites from other members of its species, and from the
sheepshead minnow (Cyprinodon variegatus); a fish having parasites
will swim almost vertically, with its head up, to let other fishes know that
it is receptive to being cleaned ; Tyler (1963) observed similar cleaning
behavior involving L. parva specimens collected from a weed bed near
Solomons, Maryland, on Chesapeake Bay, which were externally parasitized by
trematode worms, Gyrodactylus.
[Additional literature
noting collection of this species from Texas locations includes, but is not
limited to the following: Hubbs (1954); lower Rio Grande (Robinson
1959); Cow Bayou (Linam and Kleinsasser 1987a); Hillebrandt Bayou (Linam and
Kleinsasser 1987b); Gelwick et al. (2001); lower Rio Grande (Edwards and
Contreras-Balderas 1991); Independence Creek (Bonner et al. 2005).]
References
Able, K. W. 1976. Cleaning behavior in the cyprinodontid fishes: Fundulus
majalis, Cyprinodon variegatus, and Lucania parva. Chesapeake
Sci. 17(1):35-39
Baird, S.F. 1855. Report on the fishes observed on the coasts of New Jersey
and Long Island during the summer of 1854, pp. 317-353. In: Ninth
annual report of the Smithsonian Institution (1854). Smithsonian
Institution, Washington D.C.
Baylis, J.R. 1982. Unusual escape response by two cyprinodontiform fishes,
and a bluegill predator's counter-strategy. Copeia 1982(2):455-457.
Bonner, T.H., C.Thomas, C.S. Williams, and J.P. Karges. 2005. Temporal
assessment of a west Texas stream fish assemblage. The Southwestern
Naturalist 50(1):74-106.
Collette, B.B. 1977. Epidermal breeding tubercles and bony contact organs in
fishes. Symp. Zool. Soc. Lond. 39:225-268.
Cook, F.A. 1959. Freshwater fishes in Mississippi. Mississippi Game and Fish
Commission, Jackson. 239 pp.
Cowley, D.E., and J.E. Sublette. 1987. Distribution of fishes in the Black
River drainage, Eddy County, New Mexico. Southwestern Naturalist
32(2):213-221.
Duggins, C.F., Jr. 1980a. Lucania parva (Baird), rainwater killifish,
p. 535. In: D. S. Lee, et al. Atlas of North American Fishes. N. C. State
Mus. Nat. Hist., Raleigh, i-r+854 pp.
Duggins, C.F., Jr. 1980b. Systematics and zoogeography of Lucania parva,
Floridichthys, and Menidia (Osteichthyes: Atheriniformes) in
Florida, the Gulf of Mexico and Yacatan. Dis Abst. Int. 41B(3):849-850.
Edwards, R.J., and S. Contreras-Balderas. 1991. Historical changes in the
ichthyofauna of the lower Rio Grande (Rio Bravo del Norte), Texas and
Mexico. The Southwestern Naturalist 36(2):201-212.
Evermann, B.W. 1899. Report on investigations by the U.S. Fish Commission in
Mississippi, Louisiana, and Texas, in 1897. Rept. U.S. Fish Comm.
24:287-310.
Foster, N.R. 1967. Comparative studies on the biology of killifishes
(Pisces: Cyprinodontidae). Ph.D. diss. Cornell Univ., Ithaca, N.Y. 391 pp.
Gelwick, F.P., S.Akin, D.A. Arrington, and K.O. Winemiller. 2001. Fish
assemblage structure in relation to environmental variation in a Texas Gulf
Coastal wetland. Estuaries 24(2):285-296.
Gunter, G. 1950. Distributions and abundance of fishes on the Aransas
National Wildlife Refuge, with life history notes. Publ. Inst. Mar. Sci.,
Univ. Tex. 1(2):89-101.
Hardy, J.D., Jr. 1978. Development of Fishes of the Mid-Atlantic Bight: an
atlas of egg, larval and juvenile stages. Volume 2: Anguillidae through
Syngnathidae. U.S. Fish and Wildlife Service Biological Services Program,
Solomons, Maryland. 458 pp.
Harrington, R.W., Jr., and E.S. Harrington. 1961. Food selection among
fishes invading a high subtropical salt marsh; from onset of flooding
through the progress of a mosquito brood. Ecology 42(4):646-666.
Hildebrand, S.F., and W.S. Schroeder. 1928. Fishes of Chesapeake Bay.
Bulletin of the U.S. Bureau of Fisheries 43(1):1-336.
Hoffman, G.L. 1967. Parasites of North American Freshwater Fishes.
University of California Press, Berkeley. 486 pp.
Hubbs, C. 1954. Corrected distributional records for Texas fresh-water.
Texas Journal of Science 1954(3):277-291.
Hubbs, C. 1957. Distributional patterns of Texas fresh-water fishes. The
Southwestern Naturalist 2(2/3):89-104.
Hubbs,C., and R.R. Miller. 1965. Studies of cyprinodont fishes. XXII.
Variation in Lucania parva, its establishment in western United
States, and description of a new species from Interior Basin in Coahuila,
Mexico. Misc. Publ. Mus. Zool., Univ. Mich. No.127:1-104.
Hubbs, C., R.J. Edwards, and G.P. Garrett. 1991. An annotated checklist of
the freshwater fishes of Texas, with keys to identification of species.
Texas Journal of Science, Supplement 43(4):1-56.
Jordan, F. 2002. Field and laboratory evaluation of habitat use by rainwater
killifish (Lucania parva) in the St. John’s River estuary, Florida.
Estuaries 25(2):288-295.
Linam, G.W., and L.J. Kleinsasser. 1987a. Fisheries attainability study for
Cow Bayou (Segment 0511). River Studies Report No. 5. Resource Protection
Division. Texas Parks and Wildlife Department, Austin. 14 pp.
Linam, G.W., and L.J. Kleinsasser. 1987b. Fisheries attainability study for
Hillebrandt Bayou. River Studies Report No. 1. Resource Protection Division.
Texas Parks and Wildlife Department, Austin. 18 pp.
McLane, W.M. 1955. Fishes of the St. Johns River System. Ph.D. dissertation.
University of Florida, Gainsville. 361 pp.
Miller, C. and V. Guillory. 1980. A comparison of marsh fish communities
using the Wegener ring. Proc. S.E. Assoc. Fish Wildl. Agencies 34:223-233.
Peterson, M.S. and S.T. Ross. 1991. Dynamics of littoral fishes and decapods
along a coastal river-estuarine gradient. Estuarine, Coastal and Shelf Sci.
33:467-483.
Rhodes, K., and C. Hubbs. 1992. Recovery of Pecos River fishes from a red
tide fish kill. The Southwestern Naturalist 37(2):178-187.
Robinson, D.T. 1959. The ichthyofauna of the lower Rio Grande, Texas and
Mexico. Copeia 1959(3):253-256.
Ross, S.T. 2001. The Inland Fishes of Mississippi. University Press of
Mississippi, Jackson. 624 pp.
Simpson D.G., and G. Gunter. 1956. Notes on habitats, systematic characters
and life histories of Texas saltwater cyprinodontes. Tulane Stud. Zool.
4(4):115-134.
Sublette, J.E., M.D. Hatch, and M. Sublette. 1990. The Fishes of New Mexico.
University of New Mexico Press, Albuquerque. 393 pp.
Tyler, A.V. 1963. Cleaning symbiosis between the stickleback and rainwater
fish. Underwater Naturalist 1(4):18-19.
Warren, M.L., Jr., B.M. Burr, S.J. Walsh, H.L. Bart, Jr., R.C. Cashner, D.A.
Etnier, B.J. Freeman, B.R. Kuhajda, R.L. Mayden, H.W. Robison, S.T. Ross,
and W.C. Starnes. 2000. Diversity, Distribution, and Conservation status of
the native freshwater fishes of the southern United States. Fisheries
25(10):7-29.
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