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| Effect of Stocking Density on Growth of Speckled Spinefoot Siganus guttatus |
| ZOU Xiong,ZHANG Long-zhen,ZHANG Tao,HOU Jun-li,WANG Yu |
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Abstract Speckled spinefoot Siganus guttatus juveniles with body weight of (31 .30 ± 1 .63 ) g were stocked and reared in an indoor tank at the initial stocking density of 2 .48 (group A) ,4 .95 (group B) , 7 .80 (group C) and 10 .20 (group D) kg/m3 at water temperature of 25~27 ℃ for 60 days .The positive relationship between growth and stocking density was found within the rearing biomass of 2 .48~4 .95 kg/m3 .Beyond that density ,there was a negative relationship between growth and stocking density .The grow th parameters revealed that the fish in group B had significantly better grow th than the fish in groups A ,C ,and D ( P <0 .05 ) ,with the maximal body weight of (63 .11 ± 2 .52) g and the maximal body length of (12 .80 ± 0 .98) cm .The fish in group D had the least growth [body weight (50 .73 ± 4 .53) g and body length (11 .90 ± 1 .03) cm] .Food intake were found to be significant decrease with increase in stocking density ,with the maximum in group A (1 .53% ) and the minimum in group D (1 .32% ) .There was significantly lower food conversion ratio in group B than in groups A ,C ,and D (P<0 .05) .It is recommended that the optimal stocking density be of 4 .95 kg/m3 for speckled spinefoot Siganus guttatus .
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Received: 25 October 2013
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