Effect of Different Feed and Stocking Density on Survival and Growth Performance of Astacus leptodactylus (Esch., 1823) Juveniles

Abstract

The aim of this study was to investigate the combined effects of two stocking densities (650 and 1300 juveniles/m 2) and diets (live feed-Daphnia magna and commercial trout feed) on survival rate and growth performance of Astacus leptodactylus juveniles. Juveniles in the second developmental stage were used in the experiment. Final survival rate and growth paremeters of juveniles were evaluated at the end of experiment (90 days). The results of this study indicated that diets were not found effective on survival rates, though increasing stock densities reduced survival rates. The best final survival rate as 21.99 %, was achieved in the group fed with live feed and kept under the 650 juveniles/m 2 stocking density, whereas the lowest survival rate values as 10.84 % was obtained in the group fed with trout pellet and kept under the 1300 juveniles/m 2 stocking density. At the end of experiment, the highest final body weight was found in group of at 650 juveniles/m 2 stocking density and fed with trout feed. The result of our study also revealed that stocking density had a significant effect on survival rates of crayfish juvenile fed with both feeds.

Effects of dietary substitution of fishmeal by black soldier fly (Hermetia illucens) meal on growth performance, whole-body chemical composition, and fatty acid profile of Pontastacus leptodactylus juveniles

“…The use of H. illucens meal in the diet significantly affected the survival, growth performance and feed utilization of P. leptodactylus. It is worth mentioning that the survival rates observed in this study were similar (Ulikowski et al, 2006;Erol et al, 2017) or lower with those reported in other studies with the species (Mazlum et al, 2011;Hu et al, 2019). Certainly, the fact that P. leptodactylus is not yet a conventional farmed crustacean species, with rearing protocols and nutrient balanced diets still being investigated, may partly explain the low survival rates observed in the present study.…”

Growth Performance, Molting Frequency and Carapace Coloration of Two Different Size Classes of Red Swamp Crayfish (Procambarus clarkii) Fed with Different Diets

“…These results clearly show that there may be important ingredients in the structure of the formulated feed, apart from the protein ratio. For instance, Erol et al (2017) fed the 2.5 cm narrow-clawed crayfish (Astacus leptodactylus) with a 55% protein ratio of trout feed and the authors recorded the highest total and carapace lengths in this group. But we found the highest FMTL and FMCL in the red swamp crayfish fed with crustacean feed among the S1 groups.…”