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Compensatory growth in gibel carp ( carassius auratus gibelio ) after the stress of stocking density
Author(s) -
Chen Lu,
Yang Yan’ou,
Rizwan Muhammad,
Yue Ding’ding,
Khan Ibrar Muhammad,
Yao Feng,
Zhong Juan,
Huang Shuang’jie
Publication year - 2021
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.15022
Subject(s) - stocking , biology , zoology , carp , carassius auratus , feed conversion ratio , body weight , fish <actinopterygii> , endocrinology , fishery
The research was performed to investigate the compensatory growth in gibel carp ( Carassius auratus gibelio ) after the stress of stocking density; the 8‐week growth trial was performed in a proper system of 12 fibreglass tanks. Four different density groups were marked as C (control group), D 1/2 , D 1/4 and D 1/8 , and the biomasses were converted into 1.98 kg/m 3 , 3.96 kg/m 3 , 7.91 kg/m 3 and 15.82 kg/m 3 respectively. Under density stress, the final weight, protein retention efficiency (PRE), feed conversion efficiency (FCE) and specific growth rate (SGR) of groups D 1/2 , D 1/4 and D 1/8 were significantly lower than group C ( p < 0.05) and reduced with the increase in density. In the period of the recovery of activity space (5–8 weeks), groups D 1/2 , D 1/4 and D 1/8 have significantly higher feeding rate (FR), FCE and SGR than group C. There was no significant difference in body weight between group D 1/2 and group C, while the body weight of group D 1/4 and group D 1/8 was still significantly lower than group C. The hepatosomatic index (HSI) of the D 1/8 group was extremely low before and after the restoration of activity space ( p < 0.05). Under stress, the lipid contents of group D 1/4 and group D 1/8 were significantly lower than group C. Subsequently, the recovery of activity space, the lipid content of group D 1/8, was still significantly lower than group C. The results obtained indicated that the D 1/2 group (3.96 kg/m 3 ) successfully lead to wholly compensatory growth, while the D 1/4 (7.91 kg/m 3 ) and D 1/8 (15.82 kg/m 3 ) group partially lead to compensatory growth. So, higher density leads to poor compensation effect.