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Effects of temperature and salinity on the development of embryos and larvae of the veined rapa whelk Rapana venosa （Valenciennes, 1846） 总被引：1，自引：0，他引：1
The major population of the veined rapa whelk Rapana venosa(Valenciennes, 1846), which is an important fishery resource, is facing a large decline in China. We studied the effects of incubation temperature(16–34℃ at salinity 30) and salinity(5–45 at 25℃) on the incubation period and subsequent larval development. In the temperature experiment, the shortest incubation period was 12 days at 34℃, the lower temperature limit was 16℃, the longest mean shell length(1 193±17 μm) occurred at 25℃ and the highest survival rate 72.28%±5.62% was observed at 28℃. In the salinity experiment, the shortest incubation period was 15 days at 25. The salinity tolerance range was 15–40, the longest mean shell length(855±9 μm) and the highest survival rate 72.93%±4.85% were both observed at 35. This study demonstrated that, during the egg–mass stage, temperature and salinity regimes infl uence later growth and survival of larvae. These observations deepen our understanding of the ecology and conservation of natural populations of Rapana venosa. 相似文献
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动物性饵料对脉红螺(Rapana venosa)幼体的吸引性研究 总被引：1，自引：0，他引：1
采用生态学方法进行了新鲜和煮熟的动物性饵料对脉红螺(Rapana venosa)浮游幼体的吸引作用研究。结果表明, 脉红螺浮游幼体在4螺层期是食性转换期, 且在幼体到达3螺层后期的第1—6天是投放附着基和动物性饵料的最佳时期。此外, 新鲜和熟的双壳贝类肉对脉红螺幼体有明显的吸引力, 吸附于新鲜贝肉上的4螺层幼体占吸附幼体总数的48.61%, 显著大于其它螺层幼体; 脉红螺幼体选择新鲜紫贻贝肉的比例为33.75%, 显著大于菲律宾蛤仔(24.08%)、中国蛤蜊(18.97%)和长牡蛎(23.19%); 而熟贝肉中, 长牡蛎对幼体的吸引作用显著大于紫贻贝、菲律宾蛤仔、中国蛤蜊、海湾扇贝边粉和空白对照; 新鲜紫贻贝和熟长牡蛎肉具有作为脉红螺幼体食性转换期动物性饵料的开发潜力。 相似文献
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