论文部分内容阅读
系统研究了影响大鲵子二代孵化率的环境因子(包括水质、水温、孵化密度)、硬件设施和软件管理技术。从理论上阐明孵化水质的离子比例平衡直接影响孵化率和苗种成活率,试验结果表明,广州华宝珍稀水产养殖有限公司养殖场调节水和水库水适合孵化,孵化率分别为53.3%和46.7%;过高、过低孵化水温都可导致大鲵胚胎发育停止,适宜孵化水温为16~22℃,最适水温为(20±1)℃;孵化密度以每筛(25 cm×35 cm×6 cm)放150颗受精卵为宜(孵化率为48%)。在本试验设定的条件下,大鲵孵化率逐年提高,由1998年的平均3%,提高到2003年的平均18%。
The environmental factors (including water quality, water temperature, hatching density), hardware facilities and software management techniques that affect the hatching rate of the second generation of big clams were systematically studied. It is theoretically demonstrated that the ionic ratio of incubation water quality balance directly affects the hatching rate and the survival rate of seedlings. The results showed that the regulated water and reservoir water of Guangzhou Huabao Rare Aquaculture Co., Ltd. were suitable for hatching, with hatching rates of 53.3% and 46.7% %. The temperature of hatching water was 16-22 ℃ and the optimal temperature of water was (20 ± 1) ℃. The hatching density was 25 cm × 35 cm × 6 cm) put 150 fertilized eggs is appropriate (hatching rate was 48%). Under the conditions set in this experiment, the hatching rate of Daphniphyllum increased year by year from an average of 3% in 1998 to an average of 18% in 2003.