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| Effects of Illumination,Single-eyestalk Ablation and Salinity on Breeding of Red Swamp Crayfish Procambarus cl arkii |
| SONG Guangtong,DING Fengqin,WU Song,CHEN Jing,WANG Xiang,SHE Lei |
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Abstract Red swamp crayfish Procambarus clarkii was induced to spawn and to breeding by three factors (7 patterns) including illumination <100 lx ,single-eyestalk ablation and a salinity of 8 for 60 days .No significant difference was observed in survival rate of the broodstock in the experiment (P>0 .05) .There was no significance difference in spawning time and egg-carrying rate of the broodstock (P>0 .05)in the groups of illumination < 100 lx ,single-eyestalk ablation and the illuminance < 100 lx + single-eyestalk ablation ,significantly higher than that in the other 4 groups and in the control group (P< 0 .05) .The crayfish broodstocks in groups of illumination <100 lx ,the single-eyestalk ablation and illumination <100 lx+single-eyestalk ablation spaw ned 15~18 d earlier than the crayfish broodstocks in the control group did ,with as much egg carrying rate as 2 .5 times ,2 .75-fold and 2-fold in the control group ,respectively .
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Received: 25 August 2013
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