USE OF BY-CATCH FISHMEAL AS INGREDIENT IN DIETS FOR COMMON CARP FRY Cyprinus carpio
The objective of this study was to investigate the nutritional value of skate meal (SM) as replacement for commercial fishmeal (FM) in diets for common carp fry Cyprinus carpio. Five isoproteic (33% CP) and isocaloric (15 kJ DE/g) diets containing five levels of FM replacement (0, 25, 50, 75 and 100%) by SM were provided to common carp fry during 90 days (Table 1). Fish (1.138 0.013g) were distributed in 15 glass aquaria (65 liters) maintained in stagnant water, equipped with aeration and heating (26oC) system. Each dietary treatment was tested in triplicate groups of 20 fish per aquarium in a completely randomized design. The fish were fed to apparent satiation three times a day during experiments.
At the end of the study, increased level of SM in common carp fry diets led to decreased live weight gain, specific growth rate (SGR), protein efficiency ratio (PER) and feed conversion ratio (FCR) (Table 1). Greatest live weight gain was obtained in control diet and the replacement of up to 25% of the FM with SM did not significantly impair growth rate of common carp fry. While condition factor among all groups was not significantly affected by the dietary treatments (P>0.05), hepatosomatic index (HSI) was affected. The results showed that up to 25% of FM can be replaced by SM in common carp diets with no adverse effects on growth, feed utilization. Further research is needed to study on market fish for optimum SM ratio.
At the end of the study, increased level of SM in common carp fry diets led to decreased live weight gain, specific growth rate (SGR), protein efficiency ratio (PER) and feed conversion ratio (FCR) (Table 1). Greatest live weight gain was obtained in control diet and the replacement of up to 25% of the FM with SM did not significantly impair growth rate of common carp fry. While condition factor among all groups was not significantly affected by the dietary treatments (P>0.05), hepatosomatic index (HSI) was affected. The results showed that up to 25% of FM can be replaced by SM in common carp diets with no adverse effects on growth, feed utilization. Further research is needed to study on market fish for optimum SM ratio.