Fish
Green Sunfish
Lepomis cyanellus · also called green sunfishes
In a pond gone murky with silt, long after more sensitive sunfish species have vanished, a green sunfish continues thriving, its larger mouth and tougher constitution turning degraded water into an opportunity rather than a problem.
Overview
The green sunfish, Lepomis cyanellus, is a hardy, adaptable panfish native to ponds, lakes, and streams across the central and eastern United States. Its unusually large mouth and exceptional tolerance for murky or degraded water set it apart from most of its more habitat-sensitive sunfish relatives.
The sunfish that thrives where others give up
While species like the longear sunfish require clean, clear water to persist, the green sunfish takes the opposite approach, becoming more dominant precisely in the disturbed, silty habitats that push its pickier relatives out entirely.
Status
Least Concern — widespread and abundant across suitable freshwater habitat throughout the central and eastern United States.
Green Sunfish: common questions
How is the green sunfish different from the bluegill?
The green sunfish has a distinctly larger mouth relative to its body size than the bluegill, allowing it to take larger prey including small fish, and it tolerates murky or degraded water considerably better, often persisting or even dominating in ponds and streams where a bluegill population would struggle or decline.
Why does the green sunfish sometimes take over a stocked pond?
The green sunfish's aggressive temperament, tolerance for a wide range of water conditions, and willingness to hybridize readily with other sunfish species can allow it to outcompete and overpopulate a pond relative to more desirable stocked species such as bluegill, sometimes requiring active management to control its numbers.
Does the green sunfish guard its nest?
Yes, a male green sunfish constructs a shallow nest depression in sand or gravel and then guards both the eggs and the newly hatched fry until they are old enough to fend for themselves, a parental care pattern shared broadly across the sunfish family.
Where does the green sunfish live?
The green sunfish is native to ponds, lakes, and streams across much of the central and eastern United States, and its considerable tolerance for degraded water conditions has allowed additional populations to become established elsewhere through both deliberate and accidental introduction.