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| Effects of Salinity on Embryonic Development and Larval Survival in All Female Japanese Flounder Paralichthys olivaceus |
| WANG Yu-fen,SI Fei,SUN Chao-hui,SONG Li-min,JIANG Xiu-feng |
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Abstract The sinking and buoyancy of eggs were observed in hologynic Japanese flounder Paralichthys oliv aceus under various salinities to investigate the effects of salinity on embryonic development and larval survival .The results showed that hologynic Japanese flounder eggs sank at a salinity of below 27 ,were pelagic at salinity from 27 to 30 ,and were buoyancy on the water surface at a salinity of above 30 .The hatching rate of over 71 .8% was observed at a salinity of 30-50 ,no significant difference (P>0 .05) ,and deformity rate of less than 4 .3% .The hatching rate of over 64 .5% was found at salinity from 10 to 30 , with deformity rate of less than 5 .5% .There was significantly lower hatching rate at salinity from 10 to 25 than that in salinity from 30 to 50 (P <0 .05) ,while there was higher deformity at salinity from 10 to 25 than that in salinity from 30 to 50 ( P > 0 .05 ) ,indicating properly high salinity more suitable for embryonic development .The larvae tolerated the salinity from 10 to 40 ,the maximal survival activity index (SAI) value of unfed larvae at a salinity of 20 .The unfed larvae had SAI value of less than 5 (mortality ) at salinity of below 5 and over 50 .
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Received: 25 March 2014
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