very large {piracucu} {paiche} {arapaima} (Arapaima gigas).
North America, lake {bass, fish}.
east and central United States sunfish {bluegill}.
smooth skin, large flat head, long hairs {barbel} near mouth, ocean and freshwater {catfish}.
Europe, thick, spindle shape {chub}.
east Asia, red-orange color {goldfish} (Carassius auratus).
fresh water or ocean {mullet} (Mugilidae).
South America, tropical {piranha} (Serrasalmus).
Male fish {stickleback} can fight fish with red underbellies and court fish without red underbellies {key stimulus}. Stickleback fish build nests, using innate behavior.
small, South America and West Indies {guppy}.
live young, North and Central America {swordtail} (Poecilidae) (Cyprinodontiformes), related to southern platyfish {platy}.
small, striped, tropical, India {zebra fish} (Brachydanio rerio).
Fish {electric fish} (Gymnarchus) tail can generate weak electric voltages that cause discharges at 300/second. Electric organs along body detect electric field. Dorsal fin undulates to move fish forward without using tail. Objects in water alter electric field.
eel-like, South America {electric eel}.
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Date Modified: 2022.0225