Open AccessEffects of different feed stimulants on freshwater crayfish ( P rocambarus clarkii ), fed diets with or without partial replacement of fish meal by biofeed
Author(s) -
Hua X.M.,
Shui C.,
He Y.D.,
Xing S.H.,
Yu N.,
Zhu Z.Y.,
Zhao C.Y.
Publication year - 2015
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12148
Subject(s) - biology , crayfish , procambarus clarkii , zoology , meal , fish meal , feed conversion ratio , ingredient , food science , fishery , body weight , endocrinology , fish <actinopterygii>
The feeding trials were carried out with freshwater crayfish ( P rocambarus clarkii ) to evaluate the three feed stimulants betaine ( B et), squid extract ( SE ) and squid meal ( SM ) upon fish meal ( FM ) diets or biofeed ( BF ) diets in which FM were partially replaced by BF . Results showed the three feed stimulants had no significant effect on growth. By the relative concentration of markers in the faeces and diets, the preference for each diet was estimated, and the best stimulant was the mixture of B et, SE and SM . As FM replaced by BF increased, added with the mixture, the relative weight gain showed an increasing trend, but decreased significantly by 30% replacement. With the substitution increasing, trypsin activities increased, whereas decreased too upon 30% substitution. Less than 30% replacement, there was no significant effect on muscle proximate composition, intestine amylase activities and serum haemocyanin contents, except the drop of lipid. The results indicated that the mixture of B et, SE and SM could perform well as a feed stimulant. And with the addition of the mixture, FM in the diet could make about no more than 20% saving without any adverse effects.