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.
- Biogeographic Regions
- nearctic
- palearctic
- oriental
- ethiopian
- neotropical
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.
- Habitat Regions
- temperate
- freshwater
- 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.”
- Other Physical Features
- ectothermic
- heterothermic
- bilateral symmetry
- Sexual Dimorphism
- male more colorful
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.
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.
- Mating System
- polygynandrous (promiscuous)
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).
- Key Reproductive Features
- iteroparous
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- sexual
- fertilization
- oviparous
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.
- Parental Investment
-
pre-fertilization
- provisioning
-
pre-hatching/birth
-
protecting
- male
-
protecting
Lifespan/Longevity
Lepomis cyanellus
typically live between 4 and 6 years in the wild.
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.
- Key Behaviors
- natatorial
- diurnal
- motile
- sedentary
- solitary
- territorial
- social
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.
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.
- Primary Diet
- carnivore
- 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).
- 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.
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.
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.
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)
ETYMOLOGY:
“Lepomis” means scaled operculum and “cyanellus” means blue.
Additional Links
Contributors
Tanya Dewey (editor), Animal Diversity Web.
Emily Clemons (author), Eastern Kentucky University, Sherry Harrel (editor, instructor), Eastern Kentucky University.
- 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.
- introduced
-
referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- Palearctic
-
living in the northern part of the Old World. In otherwords, Europe and Asia and northern Africa.
- introduced
-
referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.
- oriental
-
found in the oriental region of the world. In other words, India and southeast Asia.
- introduced
-
referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.
- Ethiopian
-
living in sub-Saharan Africa (south of 30 degrees north) and Madagascar.
- introduced
-
referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.
- Neotropical
-
living in the southern part of the New World. In other words, Central and South America.
- introduced
-
referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.
- 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).
- freshwater
-
mainly lives in water that is not salty.
- 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.
- ectothermic
-
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
- 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.
- 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.
- polygynandrous
-
the kind of polygamy in which a female pairs with several males, each of which also pairs with several different females.
- 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).
- seasonal breeding
-
breeding is confined to a particular season
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- fertilization
-
union of egg and spermatozoan
- external fertilization
-
fertilization takes place outside the female's body
- oviparous
-
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
- natatorial
-
specialized for swimming
- diurnal
-
- active during the day, 2. lasting for one day.
- motile
-
having the capacity to move from one place to another.
- sedentary
-
remains in the same area
- solitary
-
lives alone
- 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
- social
-
associates with others of its species; forms social groups.
- visual
-
uses sight to communicate
- acoustic
-
uses sound to communicate
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
- zooplankton
-
animal constituent of plankton; mainly small crustaceans and fish larvae. (Compare to phytoplankton.)
- 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.
- carnivore
-
an animal that mainly eats meat
- insectivore
-
An animal that eats mainly insects or spiders.
References
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 .
2003. "AWAKE Plants and Wildlife" (On-line). Accessed October 27, 2005 at http://www.kentuckyawake.org/templates/plantsWildlife/lifehistory.cfm?instanceID=18954 .