Open AccessReplacement of Fishmeal by a Mixture of Soybean Meal and Chlorella Meal in Practical Diets for Juvenile Crucian Carp, Carassius auratus
Author(s) -
Shi Xi,
Luo Zhi,
Chen GuangHui,
Chen Feng,
Zhang LiHan,
Zhu XiaoMing,
Liu Xu
Publication year - 2017
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/jwas.12403
Subject(s) - biology , crucian carp , fish meal , feed conversion ratio , zoology , soybean meal , meal , digestive enzyme , juvenile , dry matter , weight gain , food science , amylase , biochemistry , endocrinology , body weight , fishery , enzyme , fish <actinopterygii> , ecology , raw material
Abstract A growth trial was conducted to evaluate the effect of a mixture of soybean meal and Chlorella meal ( SCM ) as a dietary fishmeal ( FM ) substitute on growth performance, apparent digestibility coefficients ( ADCs ), digestive enzymatic activities, and histology of juvenile crucian carp, Carassius auratus . Five isonitrogenous and isoenergetic diets were formulated to replace 0 ( SCM0 ), 25 ( SCM25 ), 50 ( SCM50 ), 75 ( SCM75 ), and 100% ( SCM100 ) of protein from FM with SCM , respectively. The diets were fed to triplicate groups of juvenile crucian carp for 6 wk. Weight gain, specific growth rate, feed intake, protein efficiency ratio, and intestinal digestive enzymatic activities (amylase, trypsin, and lipase) tended to decline with increasing FM replacement levels ( P > 0.05). Dietary SCM substitution significantly influenced dry matter content in muscle, and crude protein and lipid contents in liver ( P < 0.05). ADCs for dry matter, protein, lipid, energy, and most amino acids showed no significant differences between the control and SCM 25 group, but tended to decline with replacement levels over 25%. Higher SCM substitution (50–100%) caused karyopyknosis and necrosis in liver, but intestinal histology did not show noticeable pathological changes. The present study indicated that FM could be replaced by 25% of SCM , without significant adverse growth performance, feed utilization, and histology of crucian carp.