论文部分内容阅读
比较了盐度对大黄鱼Pseudosciaena crocea(♀)×大黄鱼(♂)自交F1和大黄鱼(♀)×鮸鱼Miichthys miiuy(♂)杂交F1初孵仔鱼存活的影响。将大黄鱼和杂交F1初孵仔鱼从盐度27的海水中分别转移至盐度12、17、22、27、32、37和42的海水中。结果表明,大黄鱼和杂交F1初孵仔鱼的存活率、平均存活时间(MST)、不投饵存活系数(SAI)随着盐度的升高呈下降趋势。在盐度12~32范围内,杂交F1初孵仔鱼的SAI值高达62.42~86.56,明显比大黄鱼初孵仔鱼高(46.18~53.89)。在盐度12条件下,大黄鱼和杂交F1初孵仔鱼的MST达到最大值,分别为(10.69±0.16)d和(13.47±0.35)d;盐度42时,MST降至最低(4.91±0.27)d和(6.30±0.27)d。相同盐度下,对大黄鱼和杂交F1初孵仔鱼的存活率下降趋势、半数死亡时间(DT50)、平均存活时间(MST)和不投饵存活系数(SAI)的分析显示,杂交F1初孵仔鱼具有更好的存活能力,表现出较强的杂种优势。
The effects of salinity on the survival of newly hatched F1 broiler of Pseudosciaena crocea (♀) × big yellow croaker (♂) selfing F1 and large-croaker (♀) × catfish Miichthys miiuy (♂) were compared. Large yellow croaker and hybrid F1 newly hatched larvae were respectively transferred from seawater of salinity 27 to seawater of salinity 12, 17, 22, 27, 32, 37 and 42 respectively. The results showed that the survival rate, mean survival time (MST) and non-feeding survival rate (SAI) of big yellow croaker and F1 hybrid newly hatched larvae decreased with the increase of salinity. In the range of 12 ~ 32 salinity, the SAI value of hybrid F1 newly hatched larvae reached 62.42 ~ 86.56, significantly higher than that of newly hatched larvae of large yellow croaker (46.18-53.89). Under salinity 12, the maximum MST of big yellow croaker and F1 newly hatched larvae were (10.69 ± 0.16) d and (13.47 ± 0.35) d, respectively; when the salinity was 42, the MST was the lowest (4.91 ± 0.27 ) d and (6.30 ± 0.27) d. Under the same salinity, the survival rates of big yellow croaker and hybrid F1 newly hatched larvae decreased, and the analysis of half life time (DT50), mean survival time (MST) and non-feeding survival index (SAI) Larva have better survivability, showing strong heterosis.