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| An Experiment on Polyculture of Pacific White Leg Shrimp Litopenaeus vannamei with Malabar Grouper Epinephelus malabaricus |
| YUAN Ruipeng,LIU Jianyong,HU Zhiguo,ZHANG Jiachen,YOU Wanghai |
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Abstract Pacific white leg shrimp Litopenaeus vannamei with body length of 2-3 cm ,4-5 cm and 8-9 cm was reared in concrete tanks of each 2 .5 m × 4 .0 m × 2 .0 m at a stocking rate of 3000 thousand individuals/hm2 for 10 days when malabar grouper with body length of 12 .3-13 .6 cm and 17 .6-18 .8 cm was stocked into the tanks at a rate of 5 fish per tank and reared for 60 days with duplication .In the control tanks ,only Pacific white leg shrimp was stocked and cultured .The results showed that there were significantly lower body weight gain and significantly higher survival for 2-3 cm and 4-5 cm shrimps in monoculture than those in the polyculture(P<0 .05) ,the maximal body weight gain in polyculture 2 -3 cm shrimps with body length of 17 .6-18 .8 cm(7 .88 g)and 4-5 cm shrimps with body length of 17 .6-18 .8 cm (7 .67 g)groups .No significant differences in survival were found in 8 -9 cm shrimp in both monoculture and polyculture (P>0 .05) .The body weight gain and survival of shrimp were affected by the size of Pacific white leg shrimp ,culture model and their interactions (P<0 .01) .In polyculture ,there was no significant effect of the body length of shrimp on body weight gain of malabar grouper (P>0 .05) ,the body weight gain being significant higher in body length of 17 .6-18 .8 cm groups than in body length of 12 .3-13 .6 cm groups (P<0 .05) .The malabar grouper showed less predation of the larger shrimp with higher survival in 8-9 cm shrimps with body length of 17 .6-18 .8 cm malabar grouper group ,indicating that there was very significant effect of sizes of shrimp and malabar grouper on growth and predation of malabar grouper (P< 0 .01) .The benefit analysis showed that the profit of Pacific white leg shrimp polyculture was significantly higher than that in monoculture (P< 0 .05) ,the profit being significantly higher in 4-5 cm shrimps polycultured with body length of 17 .6 -18 .8 cm fish ,4 -5 cm shrimps with body length of 12 .3-13 .6 cm fish ,and 2-3 cm shrimps with body length of 17 .6-18 .8 cm fish models than in the other models .The 8 -9 cm shrimp showed significantly less profit than others ,and malabar grouper was recommended to be stocked into the tanks when Pacific white leg shrimp had body length of4-5cm.
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Received: 25 July 2015
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