三疣梭子蟹“黄选1号”盐度耐受性分析

Preliminary studies on the salinity tolerance of “Huangxuan No.1” Portunus trituberculatus

中文关键词: 黄选1号  三疣梭子蟹  盐度  耐受性  LD50

英文关键词: Huangxuan No.1  Portunus trituberculatus  Salinity tolerance  LD50

中文摘要:

      通过盐度突变和渐变两种方法测定了三疣梭子蟹“黄选1号”的盐度耐受性。盐度突变条件下，Ⅱ期幼蟹24、48、72h低盐半致死浓度分别为21.655、22.109、23.184；高盐半致死浓度分别为50.711、50.061、49.612。80日龄成蟹24、48、72h低盐半致死浓度分别为5.13、7.49、8.56；高盐半致死浓度分别为54. 49、52.74、52.21。在逐渐降低盐度条件下，Ⅱ期幼蟹可在盐度6.7的海水中存活，而80日龄成蟹可在盐度为5.7的海水中存活；随着盐度逐渐升高，Ⅱ期幼蟹和80日零成蟹均可在盐度47.7的海水中存活。三疣梭子蟹“黄选1号”具有较宽的盐度耐受范围。

英文摘要:

      The salinity tolerance of “Huangxuan No.1” Portunus trituberculatus was investigated in controlled temporary water by including sudden and gradual changes in salinity. The results showed that the LD50 values of crab larvae at Stage Ⅱ for 24h,48h,72h tolerance to low-salinity were 21.655, 22.109, 23.184，respectively, and for tolerance to high-salinity were 50.711, 50.061, 49.612 respectively. The LD50 values of 80-day crabs for 24, 48, 72h tolerance to low-salinity were 5.13, 7.49, 8.56，respectively, and for tolerance to high-salinity were 54.49, 52.74, 52.21 respectively. Crab larvae at Stage Ⅱ can survive in 6.7 low-salinity water by gradual salinity decrease,and can survive in 47.7 high-salinity water by gradual salinity increase.While 80-day crabs can survive in 5.7 low-salinity water by gradual salinity decrease,and can survive in 47.7 high-salinity water by gradual salinity increase. Therefore,“Huangxuan No.1” P. trituberculatus has a strong salinity tolerability.