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| Effects of Feeding Patterns on Growth,Food Intake and Immunity of Halfsmooth Tongue-sole Cynoglossus semilaevis and on Water Quality in an Industrial Aquaculture |
| LIU Yang,LI Yong,WANG Hua,ZHOU Bangwei,WANG Xiaochen,ZHAO Ningning |
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Abstract The 5 × 2 two‐factor random animal experiment was conducted in the industrial culture condition with closed recirculation aquaculture system for 56 days to investigate the effect of monthly satiation de‐gree (MSD) and daily feeding ratio(DFR) on growth ,water quality ,food intake and immunity of juvenile halfsmoth tongue‐sole Cynoglossus semilaevis Günther with body weight of (291 .47 ± 4 .23) g and to ex‐plore an optimal feeding mode to improve efficiency of economy and ecology .The juveniles were fed at four levels of 80% ,90% ,100% ,and 110% of M SD and tw o levels of DFR including 3 times a day at a ratio of 42(first)∶29 (second)∶29(third) ,and 1∶1∶1 ,equal amount each time ,with 8 triplicate treatments . The results showed that MSD had very significant effect on daily weight gain (DWG) ,specific growth rate (SGR) and daily food intake(DFI) (P<0 .01) ,and that DFR also had significant effect on DWG ,SGR and food conversion ratio (FCR)(P<0.05) .Under inequality feeding ,there were 53 .68% higher DWG and 37 .31% higher SGR in 100% MSD than 80% MSD (P<0 .01) .In equality feeding ,however ,there were 43 .73% higher DWG and 36 .11% higher SGR in 100% MSD than 80% MSD (P<0.01) ,with the maxi‐mal daily weigh gain (3 .60 ± 0 .18) g under 100% MSD and equality feeding .Both MAD and DFR showed significant effect on the relative concentration of ammonia in water (P<0 .01) .There were 72 .22% higher (inequality feeding) (P<0 .05) and 117 .77% higher (equality feeding)(P<0.01)relative concentration of ammonia at 110% level than 90% level ,the maximal concentration of ammonia at 110% level .Both DFR and MSD had no significant effect on activities of lysozyme and superoxide dismutase (SOD) .It is conclu‐ded that feeding of 90% monthly satiation degree with different amount feeding is suitable for both grow th and water environment ,and that the combination feeding of 100% monthly satiation degree with equiva‐lence feeding is used for the best grow th .
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Received: 25 August 2015
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