Michael J. Maceina

Food habits, prey-size, and the occurrence of food in the stomachs were examined at various water temperatures among 1,152 Florida largemouth bass (Micropterus salmoidesfloridanus), northern largemouth bass (M. s. salmoides), and intergrade hybrids between the 2 subspecies in Aquilla Lake, Texas. Dietary composition, prey-size consumed, and the frequency of food items in the stomach were similar among the largemouth bass subspecies and their intergrade hybrid at temperatures between 80 and 31 0 C. A higher proportion of insects occurred in the diet of smaller (151-253 mm TL) largemouth...

Black crappie (Pomoxis nigromaculatus) growth was reduced when hydrilla (Hydrilla verticillata) coverage exceeded 50% in Lake Baldwin, Florida, between 1977 and 1979. Black crappie did not reach harvestable size (>228 mm TL) until age 3 and 4 during periods of extensive hydrilla coverage and reduced threadfin shad (Dorosoma petenense) abundance. Following hydrilla removal and shad population reestablishment, harvestable size was obtained by age 2 and growth of older fish increased.