Growth response of rainbow trout (Oncorhynchus mykiss) on substitution of shrimp meal by different protein sources
Abstract
Shrimp meal (SM) is costly major protein source of trout feed in Nepal. The present work is a feeding trial to develop cost effective formulated trout feed replacing SM by synthetic amino acids (SA), silkworm pupae (SWP) or silkworm moth (SWM). The four diets were prepared iso-nitrogenous with 44.44 (±0.5) % protein. The trial was conducted for eight weeks in three replications for each diet in random block design (RBD). For which, fry (average 0.31g) were stocked in twelve cages 0.5m3) kept in a raceway pond at a density of 2000 fry m-2. The feed was given 8 to 10 times a day to satiation. SWP feed showed significantly higher weight gain (p<0.5). Mortality rates of fry were found statistically insignificant (p>0.05) in SM, SWP and SWM feed but significant highest mortality rate (77%) was observed in synthetic amino acid. Lowest feed conversion ratio (FCR) was 1.33 recorded in SWP feed. However, FCR was calculated statistically insignificant (p>0.05) in all four diets. Study concluded silkworm meal could be a proper substitute in rainbow trout feed if it is locally available.
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