This paper studied the effects of different kind and density of baits and different starvation duration on Charybdis japonica larvae. The results showed that the preferable baits of zoaea-1 were Chaetoceros sp. and Is...This paper studied the effects of different kind and density of baits and different starvation duration on Charybdis japonica larvae. The results showed that the preferable baits of zoaea-1 were Chaetoceros sp. and Isochrysis galbana ,and their proper feeding density were 20×10 4 cell·ml -1 .The preferable bait of the larvae after zoaea-1 was Artemia salina nauplius, and its proper feeding density for zoaea-2 and zoaea-3 was 2～3 ind·ml -1 .The point of no-return for zoaea-1 of Charybdis japonica was about 66 hours. 18 hours starvation did not affect the growth of the larvae, but their livability would be decreased, and their metamorphism would be suspended along with the starvation duration.展开更多
The growth and reproduction of Daphnia magna fed with Microcystis viridis and Chlorella spp respectively and 20% fish oil + 80% yeast and yeast were studied.The intrinsic rate of natural increase of Daphnia magna(rm) ...The growth and reproduction of Daphnia magna fed with Microcystis viridis and Chlorella spp respectively and 20% fish oil + 80% yeast and yeast were studied.The intrinsic rate of natural increase of Daphnia magna(rm) was 0.243 fed with Microcystis viridis,0.301 with Chlorella spp.,0.244 with 20% fish oil + 80% yeast and 0.193 with yeast.The result showed that:Daphnia magna fed with Microcystis viridis had lower growth rates than that fed with Chlorella spp.and 20% fish oil + 80% yeast which both had full fatty acids.And the Daphnia magna fed with yeast was the lowest.So the fatty acids composition of diet may affect the growth of Daphnia magna.This paper further examined total lipids and main HUFA(EPA and DHA) compositions of the continuous three generations of Daphnia magna(in order to get rid of the effects of former diet) fed with different of above diets(except the yeast).The result showed that:the three generations of the D.magna fed with Microcystis viridishad the lowest total lipids and the percentages of the HUFA(EPA,and no DHA) have a significant decrease and get the lowest EPA in the final experiment because of the very low HUFA especially EPA and DHA in Microcystis viridis.So the results indicate that Microcystis viridis with low HUFA made the lower growth rate,spawning rate and hatching rate of Daphnia magna.展开更多
文摘This paper studied the effects of different kind and density of baits and different starvation duration on Charybdis japonica larvae. The results showed that the preferable baits of zoaea-1 were Chaetoceros sp. and Isochrysis galbana ,and their proper feeding density were 20×10 4 cell·ml -1 .The preferable bait of the larvae after zoaea-1 was Artemia salina nauplius, and its proper feeding density for zoaea-2 and zoaea-3 was 2～3 ind·ml -1 .The point of no-return for zoaea-1 of Charybdis japonica was about 66 hours. 18 hours starvation did not affect the growth of the larvae, but their livability would be decreased, and their metamorphism would be suspended along with the starvation duration.
文摘The growth and reproduction of Daphnia magna fed with Microcystis viridis and Chlorella spp respectively and 20% fish oil + 80% yeast and yeast were studied.The intrinsic rate of natural increase of Daphnia magna(rm) was 0.243 fed with Microcystis viridis,0.301 with Chlorella spp.,0.244 with 20% fish oil + 80% yeast and 0.193 with yeast.The result showed that:Daphnia magna fed with Microcystis viridis had lower growth rates than that fed with Chlorella spp.and 20% fish oil + 80% yeast which both had full fatty acids.And the Daphnia magna fed with yeast was the lowest.So the fatty acids composition of diet may affect the growth of Daphnia magna.This paper further examined total lipids and main HUFA(EPA and DHA) compositions of the continuous three generations of Daphnia magna(in order to get rid of the effects of former diet) fed with different of above diets(except the yeast).The result showed that:the three generations of the D.magna fed with Microcystis viridishad the lowest total lipids and the percentages of the HUFA(EPA,and no DHA) have a significant decrease and get the lowest EPA in the final experiment because of the very low HUFA especially EPA and DHA in Microcystis viridis.So the results indicate that Microcystis viridis with low HUFA made the lower growth rate,spawning rate and hatching rate of Daphnia magna.
