Lepomis cyanellusGreen sunfish

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Geographic Range

Lepomis cyanellus occurs in central North America, from the plains east of the Rocky Mountain range and west of the Appalachian mountain range, including northeastern Mexico and southeastern Canada. L. cyanellus have been introduced and established in a majority of the continental United States, with the exception of Florida and a few northeastern states. Lepomis cyanellus has been introduced to Africa, South America, Asia, and Europe as an exotic species. (Hammerson, 1993; Page and Burr, 7/2005)

Habitat

Lepomis cyanellus is a species with a wide tolerance to many different aquatic conditions, one reason why they have been successfully introduced elsewhere. They prefer smaller, sluggish streams and ponds, but can also inhabit lakes with weedy shorelines and slow rivers. They tolerate both turbid and clear water. (Etnier and Starnes, 2001; Paulson and Hatch, 2004)

  • Aquatic Biomes
  • benthic
  • lakes and ponds
  • rivers and streams

Physical Description

Lepomis cyanellus, like the other members of the Centrarchidae family, is brightly colored. In comparison to the other members it has a wider body (more cigar shaped) and a much larger mouth. They do not grow large enough to be considered desirable “pan-fish,” because their average length is only 12.7 to 15.24 centimeters. This is sometimes due to overpopulation, which can stunt growth. Lepomis cyanellus is blue-green in color with scattered dots of black and a white to yellow belly. They have a dark spot on the soft spinous portion of the dorsal fin, and sometimes a spot on the posterior portion of their anal fin. Females have dusky colored bars on the dorsolateral portion of their body. Immature individuals lack striking color patterns, and instead are plain gray without bands. Breeding males normally have an orange tint to the anal, caudal, pelvic, and posterior dorsal fins and vivid black, orange, and white color on their anal fin. Lepomis cyanellus has palatine teeth and 28 to 29 vertebrae. Entier and Starnes (2001) state that L. cyanellus typically has “anal fin soft rays 9 to 10 (8 to 11). Pectoral fin rays 13 to 15. Gill rakers 11 to 14.” ("AWAKE Plants and Wildlife", 2003; Etnier and Starnes, 2001)

  • Sexual Dimorphism
  • male more colorful
  • Range mass
    .97 (high) kg
    2.14 (high) lb
  • Range length
    30.48 (high) cm
    12.00 (high) in
  • Average length
    12.7-15.24 cm
    in

Development

Lepomis cyanellus embryos normally hatch in 2 days. Males guard them for another 5 to 7 days, until the young are able to swim to the top to feed. (Etnier and Starnes, 2001; Hammerson, 1993)

Reproduction

Lepomis cyanellus males normally build nests in sunny areas with a gravel substrate and preferably with cover, like rocks, logs, or clumps of grass. They construct depressions by forceful movement of their caudal fins in shallow water (4 to 355 cm deep). The nests are constructed in both colonies and singularly. The nests are aggressively defended by males. Spawning normally occurs 1 to 2 days after nest construction, when a male leads a female to his nest with the production of sounds. They then swim in circles above the nest before they actually spawn. Males can spawn with several females simultaneously. (Etnier and Starnes, 2001; Hammerson, 1993; Paulson and Hatch, 2004)

Spawning occurs in Lepomis cyanellus when the water rises above 21 degrees Celsius (70 degrees Fahrenheit). It is thought that L. cyanellus may produce the same number of eggs as Lepomis macrochirus, which is roughly 50,000. It takes normally 1 to 2 days for the eggs to hatch and another 5 to 7 days of protection from the male until they become independent (Parr, 2002).

  • Breeding interval
    Green sunfish can spawn up to every 8 to 10 days during spawning season.
  • Breeding season
    Spawning occurs from May to August.
  • Range number of offspring
    50,000 (high)
  • Average time to hatching
    2 days
  • Range time to independence
    5 to 7 days
  • Average age at sexual or reproductive maturity (female)
    3 years
  • Average age at sexual or reproductive maturity (male)
    3 years

Lepomis cyanellus males are caretakers of the young. Males start by fanning the eggs to promote oxygenation. They defend nests from predators before and after hatching. (Paulson and Hatch, 2004)

  • Parental Investment
  • pre-fertilization
    • provisioning
  • pre-hatching/birth
    • protecting
      • male

Lifespan/Longevity

Lepomis cyanellus typically live between 4 and 6 years in the wild. (Etnier and Starnes, 2001)

Behavior

Lepomis cyanellus is an aggressive species that outcompetes native species where they have been introduced. They are mainly solitary, but occur in loose aggregations, especially in breeding seasons. They are active during the day. (Etnier and Starnes, 2001)

Communication and Perception

Because L. cyanellus males lack dusky bars, it could be suggested that the bright and bold colors are means to attract females through visual cues. Males also produce sounds during mating. (Etnier and Starnes, 2001)

Food Habits

Green sunfish are dietary generalists. Green sunfish larvae consume various types of zooplankton and, as they grow, they expand their diets to include insect larvae and small snails. As juveniles and adults their diets expand to add small crayfish, fish eggs, insects, and small fish. It should be noted that, as competition decreases, their average prey size increases. ("AWAKE Plants and Wildlife", 2003; Etnier and Starnes, 2001; Paulson and Hatch, 2004)

  • Animal Foods
  • fish
  • eggs
  • insects
  • mollusks
  • terrestrial worms
  • aquatic crustaceans
  • zooplankton

Predation

Green sunfish, like other members of the family Centrarchidae, have young with a less colorful appearance; they are camouflaged to blend in with vegetation (Entier and Starnes, 2001). Their most common aquatic predators are largemouth bass (Micropterus salmoides) ; channel catfish (Ictalurus punctatus) ; flathead catfish (Pylodictis olivaris); and bullhead catfish (Ameiurus) (Paulson and Hatch, 2004; Chizinski and Pope, 2003). (Chizinski and Pope, 2003; Paulson and Hatch, 2004)

  • Anti-predator Adaptations
  • cryptic

Ecosystem Roles

Lepomis cyanellus is both a predator and prey, therefore it is a means of transferring energy through the food chain. Since it is such an aggressive species it commonly out competes native fish and affects populations of other aquatic organisms such as crayfish and freshwater mussels. (Etnier and Starnes, 2001; HAAG, et al., 1998)

Commensal/Parasitic Species

Economic Importance for Humans: Positive

Although L. cyanellus is barely suitable as a "pan-fish," they can be exciting to catch. They have a tendency to attack almost any bait and provide a tough fight for anglers, given their size. (Etnier and Starnes, 2001; Paulson and Hatch, 2004)

Economic Importance for Humans: Negative

Lepomis cyanellus is problematic for fish management because they often outcompete native fish. These fish have become an issue in bass-bluegill poulation management. (Etnier and Starnes, 2001)

Conservation Status

Lepomis cyanellus is not listed endangered or threatened either nationally or internationally. They are common and abundant throughout their range.

Other Comments

Hybridization, which is reproduction between two different species, is very common in L. cyanellus. Hybrids tend to be mostly males and grow faster than either of the parent species. Bluegill (Lepomis macrochirus) and longear sunfish (Lepomis megalotis) are common species that Lepomis cyanellus crossbreeds with. Lepomis megalotis and L. cyanellus hybrids are commonly known as “hybrid bluegills”. (Entier and Starnes, 2001; www.Kentuckyawake.org) ("AWAKE Plants and Wildlife", 2003; Etnier and Starnes, 2001)

ETYMOLOGY: “Lepomis” means scaled operculum and “cyanellus” means blue. (Etnier and Starnes, 2001)

Contributors

Tanya Dewey (editor), Animal Diversity Web.

Emily Clemons (author), Eastern Kentucky University, Sherry Harrel (editor, instructor), Eastern Kentucky University.

Glossary

Ethiopian

living in sub-Saharan Africa (south of 30 degrees north) and Madagascar.

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Nearctic

living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.

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Neotropical

living in the southern part of the New World. In other words, Central and South America.

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Palearctic

living in the northern part of the Old World. In otherwords, Europe and Asia and northern Africa.

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acoustic

uses sound to communicate

benthic

Referring to an animal that lives on or near the bottom of a body of water. Also an aquatic biome consisting of the ocean bottom below the pelagic and coastal zones. Bottom habitats in the very deepest oceans (below 9000 m) are sometimes referred to as the abyssal zone. see also oceanic vent.

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.

carnivore

an animal that mainly eats meat

chemical

uses smells or other chemicals to communicate

cryptic

having markings, coloration, shapes, or other features that cause an animal to be camouflaged in its natural environment; being difficult to see or otherwise detect.

diurnal
  1. active during the day, 2. lasting for one day.
ectothermic

animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature

external fertilization

fertilization takes place outside the female's body

fertilization

union of egg and spermatozoan

freshwater

mainly lives in water that is not salty.

heterothermic

having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.

insectivore

An animal that eats mainly insects or spiders.

introduced

referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.

iteroparous

offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).

motile

having the capacity to move from one place to another.

natatorial

specialized for swimming

native range

the area in which the animal is naturally found, the region in which it is endemic.

oriental

found in the oriental region of the world. In other words, India and southeast Asia.

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oviparous

reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.

polygynandrous

the kind of polygamy in which a female pairs with several males, each of which also pairs with several different females.

seasonal breeding

breeding is confined to a particular season

sedentary

remains in the same area

sexual

reproduction that includes combining the genetic contribution of two individuals, a male and a female

social

associates with others of its species; forms social groups.

solitary

lives alone

tactile

uses touch to communicate

temperate

that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).

territorial

defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement

visual

uses sight to communicate

zooplankton

animal constituent of plankton; mainly small crustaceans and fish larvae. (Compare to phytoplankton.)

References

2003. "AWAKE Plants and Wildlife" (On-line). Accessed October 27, 2005 at http://www.kentuckyawake.org/templates/plantsWildlife/lifehistory.cfm?instanceID=18954.

Chizinski, C., K. Pope. 2003. Importance of food Ration and Water Temperature on Growth of Juvenile Green Sunfish (Lepomis cyanellus). The Texas Journal of Science, 55/3: 263.

Etnier, D., W. Starnes. 2001. The Fishes of Tennessee. Knoxville: The University of Tennessee Press.

HAAG, W., M. WARREN, M. SHILLINGSFORDa. 1998. Host Fishes and Host-attracting Behavior of Lampsilis altilis and Villosa vibex. The American Midland Naturalist, 141/1: 149-157. Accessed October 29, 2005 at http://www.bioone.org.libproxy.eku.edu/bioone/?request=get-abstract&issn=0003-0031&volume=141&issue=01&page=0149.

Hammerson, G. 1993. "Lepomis cyanellus" (On-line). NatureServe Explorer. Accessed October 27, 2005 at https://ekumail.eku.edu/exchweb/bin/redir.asp?URL=http://www.natureserve.org/explorer/servlet/NatureServe?searchName=Lepomis%2520cyanellus.

Page, L., . Burr. 7/2005. "Lepomis cyanellus, Green Sunfish" (On-line). FishBase. Accessed October 27, 2005 at http://fishbase.org/Summary/speciesSummary.php?ID=3371&genusname=Lepomis&speciesname=cyanellus.

Paulson, N., J. Hatch. 2004. "Minnesota Depatment of Natural Resources' MinnAqua Aquatic Program" (On-line). Accessed October 27, 2005 at https://ekumail.eku.edu/exchweb/bin/redir.asp?URL=http://www.gen.umn.edu/research/fish/fishes/green_sunfish.html%23reproduction.