National Research Institute of Fisheries Science, Fisheries Research Agency, Ueda 386-0031, Japan
Number and maximum standard length (SL) of Japanese minnow consumed by bluegill were investigated in aquaria. Fifteen live Japanese minnow (2.5-7.9cm initial SL) were released into each aquarium with one bluegill (5.7-14.3cm SL) to investigate the consumption of Japanese minnow by bluegill during ten days. All bluegill except that of 5.7cm SL consumed Japanese minnow. The maximum length and the total weight of Japanese minnow preyed upon by bluegill were correlated with SL of bluegill; bluegill consumed 5.8g (5.6% of initial bluegill weight) of Japanese minnow per day at the maximum.