拟目乌贼受精卵孵化及室内附卵基附卵效果的研究

在实验室条件下,对福建沿海的拟目乌贼受精卵进行了孵化实验,研究结果表明,在水温为21℃~30℃,盐度为24~33条件下,受精卵均能孵化。在盐度为30的条件下,最适温度为24℃,孵化率达（93.3±2.9）%,孵化高峰期为23~24 d;在温度为24℃的条件下,最适盐度为30,孵化率达（93.3±2.9）%,孵化高峰期为23~24 d。不同附卵基的附卵效果研究结果表明：不同附卵基的附卵效果差异显著（P〈0.05）,网目为27 mm的聚乙烯网片附卵效果最佳,平均附卵量为193.4粒,平均附卵率32.51%;其次是15 mm的网片,平均附卵量为137.5粒,平均附卵率23.14%。直径为8 mm和10 mm的尼龙绳附卵效果也较好,平均附卵量分别为119.6粒和120.0粒,平均附卵率分别为20.09%和20.13%;直径为2 mm和4 mm的尼龙绳以及网目为2.5 mm的网片的附卵效果明显较差,平均附卵率分别为0.92%、1.45%和1.76%,基本不附卵。无论是尼龙绳还是网片,都是以直径或网目较大的附卵效果较好。

The study of the optimal ambient environment on egg hatching and the effect of different spawning substrates on adhesion to newly spawned eggs of Sepia lycidas

The experiment of the hatching Sepia lycidas egg from the coast of Fujian was conducted under the laboratory conditions. The results showed that when the water temperature at 21 ~ 30℃,salinity 24 ~ 33,the hatch occurred. When the salinity 30,the optimum temperature 24℃,hatching rate was（ 93. 3 ± 2. 9） %,and the hatching peak period was 23 ~ 24 days. When the temperature at 24℃,the optimum salinity 30,hatching rate was（ 93. 3 ± 2. 9） %,and the hatching peak period was 23 ~ 24 days. The results on the adhesion effects of different adhesion substrates showed that the adhesion effects were significantly different（ P 0. 05）,the adhesion effect of polyethylene mesh（ 27 mm） was best,the average number of attaching oosperms was 193. 4,the average adhesion rate was 32. 51%. Followed by polyethylene mesh（ 15 mm）,the average number of attaching oosperms was 137. 5,the average adhesion rate was 23. 14 %. The adhesion effects of nylon rope were better,the average number of attaching oosperms were 119. 6 and 120. 0,the average adhesion rates were 20. 09% and 20. 13%,respectively; the adhesion effects of nylon rope（ 2 mm and 4 mm） and polyethylene mesh（ 2. 5 mm） were significantly worse,the average adhesion rates were 0. 92%,1. 45% and 1. 76%,respectively.