Warmouth

The warmouth (Lepomis gulosus), is a freshwater fish of the sunfish family (Centrarchidae) that is found throughout the eastern United States. Other local names include molly, redeye, goggle-eye, red-eyed bream, and strawberry perch.

Not to be confused with Wrymouth.

Warmouth

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Centrarchidae
Genus: Lepomis
Species:
L. gulosus
Binomial name
Lepomis gulosus
(G. Cuvier, 1829)
Synonyms[2]
  • Pomotis gulosus Cuvier, 1829
  • Chaenobryttus gulosus (Cuvier, 1829)
  • Chaenobryttus coronarius (Bartram, 1791)

Description
Adult warmouth from Kickapoo State Park, Illinois.
a juvenile specimen of Lepomis gulosus from Kickapoo State Park, east-central Illinois

The adult warmouth is dark, with a mottled brown coloration. Its belly is generally golden, and the male has a bright-orange spot at the base of the dorsal fin. Three to five reddish-brown streaks radiate from the eyes, and the gill flaps are often red. It has three spines in the anal fin, 10 spines in the dorsal fin, and small teeth are present on the tongue. These fish range in size from 4 to 10 inches (10.2 to 25 cm), but can grow to over 12 inches (31 cm) in length, and weigh up to 2.25 pounds (1 kg). The warmouth is occasionally confused with the rock bass or green sunfish, both of which share its relatively large mouth and heavy body. However, the green sunfish generally has a greenish-blue variegated pattern on its gill flaps, a black spot near the base of the dorsal fin, and its fins are bordered in yellowish-white. The rock bass has 5-7 spines in its anal fin as opposed to the three in the warmouth. The warmouth tends to be a bit larger in size than either of the other two species.

Distribution

Warmouth are found throughout much of the south in the Mississippi River drainage, from the Gulf and Atlantic coasts and northward to the Chesapeake Bay, and westward throughout Texas to the Rio Grande, and northward into the Great Lakes basin area.[3][4] The warmouth is a highly aggressive and hardy fish, and they can live in ponds, lakes, rivers, and backwater streams and can often survive in streams with low oxygen levels where other species of sunfish cannot. The species exists with breeding populations in southern portions of Canada, and likely has existed there for many years prior to being detected.[5]

Ecology

The primary diet of the warmouth consists of insects, crayfish, and other fish.[3] They are sight feeders, and can survive in polluted, low-oxygenated waters where other sunfish cannot, like rock bass. The largest factor affecting warmouth density and biomass in Florida's lakes is the availability of aquatic macrophytes, which allows the fish to ambush prey and use as areas to spawn.[6] The primary diet of young warmouth is microcrustaceans and aquatic insect larvae, whereas larger specimens tend to mainly consume crayfish, freshwater shrimp, and other small fish.[7][8] Their predators include larger fish, snakes, turtles, alligators, and birds. The primary habitats the warmouth occupies are areas with ample vegetation as cover with slower-moving water, often around stumps, brush piles, and other dense entanglements that allow the warmouth the ability to ambush prey, yet escape larger predators that may threaten them.[3]

Life history
A warmouth in Mississippi

Spawning for the warmouth begins usually begins when water temperatures reach 21.1 °C.[9] Their spawning often begins in May and lasts until July. Nests are primarily constructed on rock or gravel substrates, usually located in or near to some type of structure in the water column. Unlike most other Lepomis species, the warmouth does not nest in a colony unless ideal nesting habitat is limited. When in breeding condition, the males' eyes turn red. After the female lays her eggs, the male fertilizes the eggs and aggressively defends the nest, eggs and fry from any intruder-including other females. Males are most commonly found defending the nest for up to five days later until the fry have hatched.[3] Young warmouth spend most of their time hiding under benthic substrate available to avoid predators. Most are considered sexually mature after one year, but often the size of a fish indicates its maturity rather than time.[3] Males usually grow faster than females. Different habitat conditions also reflect the lifespan of the warmouth, which varies from three to eight years.[10]

The warmouth is an extremely adaptable species that can survive in many different conditions, in many river systems east of the Rocky Mountains. Often, the warmouth prefers habitats where slower-moving and polluted water. The most common cause of concern for the warmouth is hybridization with other Lepomis spp. that often inhabit the same areas as the warmouth. The species known to hybridize with it are L. cyanellus and L. macrochirus, as well as largemouth bass Micropterus salmoides and black crappie Pomoxis nigromaculatus.[11][12] This does not seem to affect the overall health or longevity of the species.

Since warmouths are not migratory fish, their populations should be relatively easily monitored throughout much of their existing ranges. According to Warren,[4] there is no threat or current concern for the warmouth.

Relationship with humans

The IGFA all tackle world record for the species stands at 1.10 kg (2 lb 7oz) caught in Holt, Florida in 1985.[13]

gollark: We need this very badly.
gollark: Can we make an infinitely recursive shop? An XShop which sells XShopShops?
gollark: The MetaShopMetaShop sells shops which sell shops which sell shops which sell shops. Buy your ShopShopShop now!
gollark: We could also have a ShopShopShop.
gollark: MetaShop sounds better,

References
  1. NatureServe (2013). "Lepomis gulosus". IUCN Red List of Threatened Species. 2013: e.T191830A18236052. doi:10.2305/IUCN.UK.2013-1.RLTS.T191830A18236052.en.
  2. Froese, Rainer and Pauly, Daniel, eds. (2019). "Lepomis gulosus" in FishBase. December 2019 version.
  3. Larimore, Kenneth D. 1957. Ecological Life History of the Warmouth Centrarchidae. Illinois Natural History Survey, Bulletin 27(1):1-83
  4. Warren, L. W., 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.
  5. Crossman, EJ; Simpson, RC. 1984. Warmouth, Lepomis-gulosus, a fresh-water fish new to Canada. Canadian Field-Naturalist. 98 (4): 496-498
  6. Willis, D.J.; D.L. Watson; M.V. Hoyer; D.E. Canfield. 2009. Factors related to Warmouth Lepomis gulosus biomass and density in Florida lakes. Florida Scientist 72:3:218-226
  7. Etnier, D. A., and W. C. Starnes. 1993. The fishes of Tennessee. University of Tennessee Press, Knoxville, TN.
  8. Tumlison, Renn; Carroll, Christian; Greenwood, Matt. 2007. Summer food habits of young grass pickerel Esox amercanious, warmouth Lepomis gulosus, and log perch Percino caprodes from a cove in Lake Ouachita, Garland County, Arkansas. Journal of the Arkansas Academy of Science 61:134-136
  9. Ross, S. T. 2001. The Inland Fishes of Mississippi. University Press of Mississippi, Jackson. 624 pp.
  10. Gatz, A.J., Jr.; S.M. Adams. 1994. Patterns of movements of centrachids in two warm-water streams in eastern Tennessee. Ecology of Freshwater Fish 3:1:35-48
  11. Merriner, J.V. 1971. Egg size as a factor in intergeneric hybrid success of centrarchids. Trans. Amer. Fish Soc. 100(1):29-32.
  12. Lee, D. S. 1980. Lepomis gulosus (Cuvier),Warmouth. pp. 595 in D. S. Lee, et al. Atlas of North American Freshwater Fishes. N. C. State Mus. Nat. Hist., Raleigh, i-r+854 pp
  13. "Warmouth". igfa.org. IGFA. Retrieved 17 June 2019.

Texas Parks and Wildlife Department, http://www.tpwd.state.tx.us/huntwild/wild/species/war/

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