Page 63 - New additives and ingredients in the formulation of aquafeeds

The complete carcass analyses of fish for the different diets were similar in
the case of lipids. However, in the case of proteins, a higher proportion was
found in the experimental diets than the control.
There were no differences between treatments for the parameters VSI
(Viscerosomatic index), HIS (Hepatosomatic Index) and GSI (Gonado-
Somatic Index), being higher the initial values of VSI and HSI comparing to
the final results.
The fillets of fish fed by Diet B had the higher proportion of w-6 fatty acids
and 18: 2n-6. The results of A and control diets were similar.
The different diets tested did not affect the oxidative capacity of the fillet
in the slaughter of animals.
The external appearance of the fish at the end of the experience did not
differ between diets.
Conclusions trial 2
· Diets composed of protein hydrolysates improves absolute weight and
yield compared to control diet
· Same condition factor in fish (VSI, HSI and GSI) in the three diets
· Higher protein assimilation in fillet with diets hydrolysates diets
· It does not affect the oxidative state of the fillet at the slaughter
moment
· It does not affect the external appearance of the fish
Plant protein isolates and hydrolysates as alternative to the animal protein in aquaculture diets 61