Intensive Rearing of Young Roach (Rutilus rutilus(L.)) at 20°C

摘要

SUMMARYA re‐circulating system was used to examine the growth of two groups of young roach at an above ambient temperature of 20°C. An artificial diet was developed on which fish of one summer grew from 1.0 to 6.9 g over a 4.5 month winter period. Partial gonad development and the decrease in food intake to 1 body weight per day amongst fish of greater than 30 g were found to be serious limitations to growth. Parasitic diseases were readily controlled but the appearance of chronic kidney disease remains unexplain