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| Application and Economic Benefits of Probiotics in 80∶20 Fish Culture Ponds |
| LI Nanchong,ZHONG Lei,YANG Ke,YU Ping,LI Yuanpeng,JI Hong,REN Tongjun |
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Abstract In this study ,production and economic benefits were evaluated in 80∶20 fish culture ponds in which probiotics were applied .Common carp Cyprinus carpio with body weight of 242 g ,silver carp Hy‐pophthalmichthys molitrix with body weight of 160 g ,and bighead carp A ristichthys nobilis with body weight of 330 g were stocked into two test ponds with water surface area of 0 .13 hm2 and depth of 1—1 .3 m at a stocking rate of 0 .42 kg/m3 ,0 .07 kg/m3 ,and 0 .07 kg/m3 ,and fed the diet containing probioticsⅠand Ⅱ at a rate of 5 mL/kg in the experimental pond and the basic diet in the control pond for 40 and 80 days .The results showed that common carp had average body weight of 627 g in the treatment group , higher than the fish in control group (body weight of 565 g ,and body weight gain of 8961 .67 kg/hm2 ) in treatment group ,41 .8% higher than that in the control group (6319 .80 kg/hm2 ) .But there were lower body weight gain in filter feeder silver carp and bighead carp in treatment pond than in the control group . Low ammonia nitrogen level ,appropriate range of pH value ,high DO level and low food conversion ratio were observed in treatment pond ,7 .8% lower food conversion ratio in treatment pond than in the control pond .The total output value was increased by 36888 .90￥/hm2in treatment pond ,higher than that in the control pond ,indicating that the findings provide reference to the application of probiotics in aquaculture .
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Received: 25 April 2015
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