The jumping ability and behaviour of green sunfish (Lepomis cyanellus) at the outflow of a 1.6 ha pond
plunging, activity, flow rate, body length, horizontal
Journal or Book Title
Transactions of the American Fisheries Society
Effects of a plunging water flow on the behaviour of green sunfish (Lepomis cyanellus)7.1 to 9.7 cm in total length were studied at the outflow of a 1.6-ha pond. Jumping ability andbehaviour were measured at 12-hr intervals using a fish's position in a 0.9 m2-vertical grid or inthe discharge pipe. Activity was influenced by flow rate, time of day, and time of year. Fishjumped up to 10 times their body length and traversed a horizontal distance of 0.6 m. Fish withthe greatest mean length jumped the highest. The majority of the fish were captured during the0600-hr tending period: 79.9% pipe only study and 82.4% pipe and grid combined study.