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| The Effects of Salinity and Temperature on Survival and Metamorphosis in Zoea of Chinese Tiger Crab Orithyia sinica |
| WEI Guo-qing,LI Xiao-dong,CAO Chen,XING Zuo-ping,SONG Song-wei,ZHONG Ling |
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Abstract The effects of sharp and gradual changes in salinity (5 ,10 ,15 ,20 ,25 ,30 ,35 ,40 ,and 45) and temperature (0 ,5 ,10 ,15 ,20 ,25 ,30 ,35 ,and 40 ℃)on survival and metamorphosis in zoea of Chinese tiger crab Orithyia sinica were studied in a biochemical incubator by testing recovery to evaluate the adaptability of salinity and temperature by SPSS17 .0 .The results showed that the sudden and gradual changes in salinity and temperature led to significantly affect the larval survival and metamorphosis ( P<0 .01) . There was higher metamorphosis rate in gradual change groups than that in the sharp change groups except in the gradual change group at 25 ℃ .There was no significant difference in the tolerant capacity of salinity and temperature in zoea Ⅱ and zoea Ⅲ ,significantly higher than those in zoea Ⅰ .No significant difference in survival rate was observed in the zoea under sudden and gradual changes in salinity and temperature during recovery when the salinity and temperature were changed from 25 to other gradient at a rate of five degrees a day .The zoea showed a trend of increasing recovery capacity from zoea Ⅲ >zoeaⅡ >zoea Ⅰ .
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Received: 25 December 2013
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