大鳞鲃的人工繁殖、胚胎发育和耐盐碱测定

The artificial propagation,embryonic development and saline-alkali tolerant experiment of Barbus capito

  • 摘要: 2008-2010年进行大鳞鲃的人工繁殖和胚胎发育观察,并测定了胚胎、仔鱼的耐盐碱能力。结果表明,大鳞鲃是产漂流性卵的鱼类,繁殖性周期为1年产卵1次类型。水温19~23 ℃时,催产药物的效应时间在21~26 h,1.4~2.3 kg的雌性亲鱼产卵量在8×105~1.4×106粒,人工繁殖的催产率、受精率和孵化率平均为63.9%、81.5%、86.6%。大鳞鲃的卵为灰白色,直径约1.5 mm,遇水后卵膜会迅速吸水膨胀,1 h后达到最大为4.5 mm。水温20~23 ℃时,从卵授精到仔鱼孵出需要的积温为49.82 ℃·d,到仔鱼平游摄食需要积温125.14 ℃·d,刚出膜的仔鱼全长(6.07±0.18) mm,当达到(8.30±0.47) mm开始平游摄食。在耐盐碱实验中,测得大鳞鲃的胚胎72 h在盐度3.2以下、碱度14.32 mmol/L以下的水体中对成活率无影响;仔鱼96 h在盐度5.1以下、碱度14.32 mmol/L以下的水体对成活率无影响。

     

    Abstract: From 2008 to 2010,the artificial propagation and embryonic development observation of Barbus capito were conducted,alkaline-and saline-adapted ability of embryos and larvae were evaluated.The results show that B.capito lays pelagic eggs and reproductive cycle spans a whole year.At the temperature of 19-23 ℃,the response time of induced spawning drug was 21-26 h.The fecundity of the females(1.4-2.3 kg)was about 8×105-1.4×106 eggs.The induced spawning rate,fertilization rate and hatching rate were 63.9%,81.5% and 86.6%,respectively.The eggs of B.capito were off-white and the maximum egg diameter was 4.5 mm after absorbing water.At temperature of 20-23 ℃ the accumulated temperature was 49.82 ℃·d from fertilization to the hatching-out larva,and 125.14 ℃·d to the floating-up larva.The length of larva,just hatching out,was(6.07±0.18) mm,and the length of larva,just floating-up,was(8.30±0.47) mm.The saline-alkali tolerant experiment showed that there was no impact on survival rate of embryos(72 h)when salinity was below 3.2 and alkalinity was below 14.32 mmol/L,and there was no impact on survival rate of larvae(96 h)when salinity and alkalinity was below 5.1 and 14.32 mmol/L respectively.

     

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