The author reviews the status of wild populations of Acipenserreformes in China and examines sturgeon aquaculture. The statistic data shows that the farmed production had been raised up to about 5000 tonnes by 2002 an...The author reviews the status of wild populations of Acipenserreformes in China and examines sturgeon aquaculture. The statistic data shows that the farmed production had been raised up to about 5000 tonnes by 2002 and that China had become the biggest sturgeon aquaculture country in the world. Measures on conservation and management for sturgeon aquaculture and wild population protection should be promptly taken.展开更多
文摘The author reviews the status of wild populations of Acipenserreformes in China and examines sturgeon aquaculture. The statistic data shows that the farmed production had been raised up to about 5000 tonnes by 2002 and that China had become the biggest sturgeon aquaculture country in the world. Measures on conservation and management for sturgeon aquaculture and wild population protection should be promptly taken.
文摘本文研究在不同浓度Na+、K+、Ca2+、Mg2+、Cu2+及葡萄糖、果糖溶液中,中华鲟(Acipenser sinensisGray)精子活动情况。结果表明:Na+浓度为2‰时,中华鲟精子寿命时间(Life time,LT)最长,为347s,而Na+浓度为1‰时,中华鲟精子剧烈运动时间(Acute movement time,AT)最长,为98.67s,精子激活率在Na+浓度小于等于2‰时,为100%,随着Na+浓度的增加中华鲟精子激活率明显下降;与Na+溶液不同,在K+浓度为0.005‰时中华鲟精子活力最佳,其AT和LT最长,分别为80s和174s。而精子激活率随K+浓度增加而增强,在浓度为0.005‰时激活率最强为60%,然后快速下降;在Ca2+、Mg2+、Cu2+三种溶液中,随着三种溶液浓度的增加,中华鲟精子剧烈运动时间和寿命逐渐缩短,精子激活率逐步下降;与Ca2+、Mg2+、Cu2+三种溶液完全不同的是,随着葡萄糖和果糖两种单糖浓度的增加,中华鲟精子AT及精子LT逐渐延长。结果说明适量浓度的Na+、K+可以延长中华鲟精子AT及其LT,激活精子活力;而Ca2+、Mg2+、Cu2+三种溶液即使在较低浓度下都表现出对中华鲟精子AT、精子LT及其激活率明显的抑制作用;而葡萄糖和果糖则能有效地延长中华鲟精子AT和LT。
