长江中游大型植物湖与藻类湖间鲫鱼生长及种群结构的变化

Cheng-Shing Lin, W. China
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引用次数: 1

摘要

人类活动对长江湖泊鱼类种群结构和生态环境产生了深刻影响。为评价环境退化对鱼类种群结构的影响,于2006年3 - 5月对武汉市富营养化城市湖泊(月湖)和城郊大型植物湖泊(牛山湖)的鲫鱼种群特征进行了比较研究。从两个不同的湖泊中收集鱼类并进行比较,同时对水质进行测量。结果表明:(1)pH、电导率、TN-N、TP-P和Chl。月湖的a值高于牛山湖。总鱼类和肉食性鱼类的数量在月湖湖不到Niushan湖。(2)的相对生物量鲫鱼在月湖湖高于Niushan湖,按照multimesh以刺网捕鱼抓单位工作(CPUE)在月湖湖更高。(3)长度分布的鲫鱼Niushan和月湖显示典型的湖泊分布在kolmogorov-Smirnov测试时,长度范围63 - 271毫米(峰值在150毫米)和72 - 191 mm(峰值(4)牛山湖鲫鱼的年龄结构较为复杂,有6个年龄组,而岳湖只有3个年龄组,年龄1的比例最大,占89%。(5)体重(W)与总长度(L)的关系用方程W= aL b表示,其中,在牛山湖,W=1* 105 L 3.06(r2 =0.9893),在岳湖,W=6×10 6 L 3.22(r2 =0.9649)。协方差分析表明,两湖鲫鱼长重关系差异极显著(P0.01)。与此同时,月湖鲫鱼的生长优势明显高于牛山湖,3个长度组的雌、雄鱼条件因子均显著大于牛山湖。(6)随着两湖鲫鱼长度的增加,雄鱼的相对比例呈下降趋势,且月湖鲫鱼的这种变化比牛山湖更为明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
GROWTH AND POPULATION STRUCTURE VARIATIONS IN CRUCIAN CARP (CARASSIUS AURATUS) BETWEEN A MACROPHYTIC LAKE AND AN ALGAL LAKE AT THE MIDDLE PART OF YANGTZE RIVER BASIN
Human activities have profoundly affected the environment and population structures of fishes in Yangtze lakes.In order to evaluate the effects of environmental degradation on fish population structure,a comparative study on population characteristics of crucian carp Carassius auratus between a eutrophic urban lake(Yuehu Lake) and a macrophytic suburban lake(Niushan Lake),both in Wuhan,was carried out during March to May 2006.Fishes were collected and compared from the two different lakes,and the water quality was measured at the same time.Results showed that:(1) pH,conductivity,TN-N,TP-P and Chl.a of Yuehu Lake were higher than those of Niushan Lake.The numbers of total fish species and carnivorous fish species in the Yuehu Lake were fewer than those in the Niushan Lake.(2) The relative biomass of crucian carp in Yuehu Lake were higher than that in Niushan Lake,as per the multimesh gillnet catch per unit effort(CPUE) in Yuehu lake was higher.(3) Length distributions of crucian carp in both Niushan and Yuehu Lakes showed typical distributions when tested by kolmogorov-Smirnov,with a length range 63—271 mm(peak at 150 mm) and 72—191 mm(peak at 120 mm),respectively.(4) The crucian carp in Niushan Lake had a more complex age structure with six age groups,while Yuehu Lake had only three,with age 1 representing the largest proportion of 89%.(5) The relationship between weight(W) and total length(L) has been represented by the equation W= aL b,where W=1*10 5 L 3.06(R 2 =0.9893) in the Niushan Lake and W=6×10 6 L 3.22(R 2 =0.9649) in the Yuehu Lake.Analysis of covariance demonstrated that the length-weight relationship of crucian carp are significantly different between the two lakes(P0.01).Meanwhile,the crucian carp in Yuehu Lake showed a growth advantage compared to those in Niushan Lake for fish condition factors of males and females from all of the three length groups in Yuehu Lake were all significantly greater than those in Niushan Lake.(6) As lengths of crucian carps in both lakes were increasing,the relative proportion of males declined;this change for male crucian carp in Yuehu Lake was more acute than in Niushan Lake.
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