Meaning

noun the lean flesh of any of numerous American perch-like fishes of the family Centrarchidae

noun among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters

noun small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies; black bass; bluegills; pumpkinseed

origin* From sun + fish. * (type of fish): Perhaps from the rounded body shape.

Etymology from Wiktionary, CC BY-SA 3.0