H. R. Robinette

Nine-day-old hybrid striped bass (Morone saxatilis x M. chrysops) were stocked into fertilized O.04-ha freshwater ponds at 3 densities with 3 replications each and fed a 55% crude protein feed at 0.45 kg/day/pond divided equally into 4 daily feedings for 33 days. There were no significant (P > 0.05) differences for average weight gain or survival among the densities: 123,500 fishlha, 1.2 g, 57.4%; 247,000 fishlha, 0.7 g, 41.2%; and 370,500 fish/ha, 0.8 g, 31.8%. Fingerlings averaging 0.75 g were subsequently stocked into 0.04-ha fresh water (alkalinity ca. 100 mglliter, hardness 42 mg/...

Winter growth of young-of-the-year bluegills (Lepomis macrochirus) and male bluegill X female green sunfish (L. cyanellus) hybrids was compared. After 112 days in ponds with a mean afternoon surface water temperature of 10.4 0 C, and under monospecies and bispecies culture conditions, the hybrids were significantly (P < 0.01) longer and heavier than the bluegiIls, outgrowing the bluegills by a ratio of approximately 2: 1.

The effects of supplemental feeding on the winter growth of male bluegill (Lepomis machrochirus) x female green sunfish (L. cyanellus) F1 hybrids were investigated in northeast Mississippi. Four 0.04 ha ponds were each stocked at the rate of 2471 fish per ha. Fish in 2 ponds were fed daily while the other fish subsisted only on natural food. Mter 90 days at water temperatures below 15 C, fed fish were significantly (P <0.05) heavier. but not longer than non-fed fish. Coefficients of Condition (K) for fed fish showed a significant (P < 0.05) increase through the winter and were...

Food items of 29 channel catfish (Ictalurus punctatus) collected during flooding of the Tombigbee River, Mississippi were almost exclusively composed of insects although other arthropods and in 1 case 2 rodents were eaten Terrestrial insects composed 84.7%, by weight, of the food eaten by catfish taken during floods compared to 1.2%, by weight, of the stomach contents of 15 catfish taken during normal flow conditions. Members of the orders Rodentia, Oligochaeta, Orthoptera and Trichoptera were the dominant foods, by weight, during flood conditions, contributing 64.4,6.1,6.0 and 5.8%,...

A field investigation of 3 cutoff bendways and 1 natural bendway in the Tennessee-Tombigbee Waterway (Tombigbee River) was conducted from December 1979 to September 1980. Conductivity, pH, and current were significantly different (P < 0.05) among transects regarding corresponding bendway locations. Conductivity, dissolved oxygen, current, carbon dioxide, alkalinity, secchi visibility, turbidity, ammonia, total phosphorus, and orthophosphorus were significantly different among bendways. Dissolved oxygen stratification occurred from late July through August with little or no dissolved...

Duckweed (Family Lemnaceae) was incorporated into 6 isocaloric diets which were fed for 10 weeks to channel catfish (Ictalurus punctatus) fingerlings in aquaria. Three diets contained surplus essential amino acids while utilizing duckweed at 0, 15, and 20 percent of the diet. Three other diets had the same levels of duckweed, but contained borderline levels of amino acids. No significant difference in mean weight gain per fish was found within each group of 3 diets. Feed conversion and kcal of energy required per g of weight gain were not statistically different for the fish fed the 6...