Influence of Stocking Densities on Walleye Fry Viability in Experimental and Production Tanks

Publisher Website
Google Scholar
Abstract
In 1992 at Rathbun State Fish Hatchery, experiments were conducted to evaluate the effects of stocking density on performance of larval walleyes (Stizostedion vitreum) in small (278-L) cylindrical tanks, and to compare fry performance in production-scale (679-L) and small tanks. Hatched fry were reared for 21 d and fed Fry Feed Kyowa B400 and B700 in all experiments. Densities of 20, 30, and 40 fry/L were evaluated in two trials, and densities of 20, 50, and 60 fry/L were evaluated in another trial. Fry performance did not differ significantly among density treatments of 20, 30, or 40 fry/L. In the other trial, however, survival was significantly greater for fish stocked at 20 fry/L than for fish stocked at 50 or 60 fry/L, but the number of fry produced (yield) was 216% greater in the tanks stocked at 60 fry/L. Growth rate was not affected by density in any trial. For comparisons between 278-L and 679-L tanks, three 679-L tanks were stocked at 20 fry!L in each of the three trials. Survival and vi...

This publication has 0 references indexed in Scilit: