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首页> 中文期刊> 《淡水渔业》 >滇池金线鲃、西畴金线鲃及其杂交 F1代抵抗小瓜虫与车轮虫能力的探究

滇池金线鲃、西畴金线鲃及其杂交 F1代抵抗小瓜虫与车轮虫能力的探究

         
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用小瓜虫（Ichthyophthirius multifiliis）和车轮虫（Trichodina spp.）对滇池金线鲃（Sinocyclocheilus grahami）和西畴金线鲃（S.xichouensis）及其杂交 F1代分别进行了两次人工感染实验。18月龄的杂交 F1代、滇池金线鲃（Sino－cyclocheilus grahami）和西畴金线鲃（S.xichouensis）感染小瓜虫后平均死亡率分别为（50.00±11）％、（56.70±23）％、（80.0±18）％。经方差检验杂交 F1代死亡率显著低于父本西畴金线鲃。6月龄杂交 F1代、滇池金线鲃、西畴金线鲃感染车轮虫后的平均死亡率分别为（40.56±13）％、（56.11±5）％、（42.78±13）％。经方差检验杂交 F1代死亡率显著低于母本滇池金线鲃。在感染小瓜虫和车轮虫后，三种鱼的死亡量均呈现激增后又显著回落的趋势，死亡高峰在第4天至第7天。本次感染实验的小瓜虫和车轮虫主要分布于病鱼体表：躯干分布最多57％～79％，其次为鳍12％～28％，头部分布较少4％～15％。与本研究中车轮虫几乎于鳃丝无分布（0％～3％）不同，有大约10％～20％的小瓜虫分布于鳃丝上。%Sinocyclocheilus grahami, S.xichouensis and their hybrid F1 (S.grahami ♀ ×S.xichouensis ♂) were infected twice by Ichthyophthirius multifiliis and Trichodina spp.artificially to conduct a investigation of their resistibility .The mean mortality rate of one and half a year ′s hybrid F1, S.grahami and S.xichouensis which infected by I.multifiliis was (50.00 ±11)%, (56.70 ±23)%, (80.0 ±18)% respectively.The mortality rate of hybrid F1 was significantly lower than that of S.xichouensis by analysis of variance (P <0.05), it showed that the resistibility of hybrid F1 was obviously higher than its male parent.The mean mortality rate of half of a year ′s hybrid F1, S.grahami and S.xichouensis which in-fected by Trichodina spp.was (40.56 ±13)%, (56.11 ±05)%, (42.78 ±13)% respectively.As a result of analysis of variance, mortality rate of hybrid F1 was significantly lower than that of S.grahami , it showed that resistibility of hybrid F1 was higher than its female parent apparently .Hybrid F1, S.grahami and S.xichouensis showed the similar tendency in mortality, it rose significantly in the first 3 days and reached the top during the 4th to 7th day, and then had a gradual fall, finally it dropped to 0.Trichodina spp.which was used to infect fish in this experiment appear mainly on skin of body sur -face: there are about 57% ~79% on trunk, 12% ~28% on fins and fewer on head 4% ~15%.There are 10% ~20%I.multifiliis which was found on gills, different with I.multifiliis there are rarely Trichodina spp.be found on gills in this research 0% ~3%.

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