The possibilities of replacing slaughterhouse byproduct meals (blood meal, poultry-by products, meat and bone meal) into menhaden fish meal in salmonid (rainbow trout fry) diets were economically analyzed in this study. Fish meal levels of diets were balanced as 30% and 45%, and 10 test diets with average 34% (first five diets) and 41% (last five diets) protein and about 3500 kcal/kg metabolic energy were made by replacing 0, 25, 50, 75 and 100% slaughterhouse byprolucts into these categories of fish meal. As a control feed, a commercial feed with 55% protein (min.) and 2900 kcal ME/kg was used. Rainbow trout fry with an average 1.75 ± 0.08 g initial weights were fed with prepared test diets and control diet as three replicates (in total 33 tanks) for a period of 150 days ( 140 feeding days). In aspects of the economic analysis of the feeds, various profits obtained from the groups, and the differences between the profits were statistically significant (p

The possibilities of replacing slaughterhouse byproduct meals (blood meal, poultry-by products, meat and bone meal) into menhaden fish meal in salmonid (rainbow trout fry) diets were economically analyzed in this study. Fish meal levels of diets were balanced as 30% and 45%, and 10 test diets with average 34% (first five diets) and 41% (last five diets) protein and about 3500 kcal/kg metabolic energy were made by replacing 0, 25, 50, 75 and 100% slaughterhouse byprolucts into these categories of fish meal. As a control feed, a commercial feed with 55% protein (min.) and 2900 kcal ME/kg was used. Rainbow trout fry with an average 1.75 ± 0.08 g initial weights were fed with prepared test diets and control diet as three replicates (in total 33 tanks) for a period of 150 days ( 140 feeding days). In aspects of the economic analysis of the feeds, various profits obtained from the groups, and the differences between the profits were statistically significant (p