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本文是根据云南星云湖、杞麓湖中所产大头鲤进行一些生态习性的研究。大头鲤的年龄鉴定是依据鳞片上环片切割现象。依星云湖的标本实测平均体长,Ⅰ龄为135.12毫米,Ⅱ龄鱼为196.93毫米,Ⅲ龄鱼为241.92毫米,Ⅳ龄焦为288毫米。星云湖和杞麓湖大头鲤体长和体重的关系式分别为:W=0.00001283L~(3.0719),W=0.00002181L~(2.9895)。食性极为单纯,主要是以枝角类和桡足类为食。不同大小个体的食性差异不大。Ⅰ龄鱼部分达到性成熟,Ⅱ龄鱼全部性成熟。其中性成熟最小个体雌鱼体长为140毫米、体重52克。雄焦体长为117毫米,体重32克。生殖季节是4～9月,以5～6月为旺季。分批产卵,卵粘附于水草上。从星云湖五批大头鲤渔获物的长度组成来看,捕捞对象是以Ⅰ、Ⅱ龄鱼占绝对优势,这可以说明捕捞过度已引起资源的衰退。为此我们提出大头鲤在湖内捕捞最低规格是全长200毫米、体重100克。并且建议在每年5～6月生殖旺季时可实行禁捕一个月。
This article is based on Yunnan Xingyun Lake, Qilu Lake in the head carp to carry out some ecological habits of research. The age of large carp identification is based on the phenomenon of ring cut on the scales. According to the average body length of specimens of Xingyun Lake, age was 135.12 mm, age Ⅱ was 196.93 mm, age Ⅲ was 241.92 mm, and age Ⅳ was 288 mm. The relationship between the body length and body weight of the head carp and the head carp of Nelumbo nucifera and Qilu Lake were as follows: W = 0.00001283L ~ (3.0719), W = 0.00002181L ~ (2.9895). Feeding is extremely simple, mainly based on claddings and copepods for food. Few differences in diet between individuals of different sizes. Ⅰ part of the fish reached sexual maturity, Ⅱ age fish all sexual maturity. The smallest individual sexually mature female body length of 140 mm, weighing 52 grams. Male coke body length of 117 mm, weight 32 grams. Reproductive season is from April to September, 5 to June for the season. Spawning in batches, the eggs stick to the plants. From the length of the catch of the five big-headed carp in the Xingyun Lake, the fishing target is based on the first and second-year-old fish, which shows that the excessive fishing has caused the decline of resources. To this end we propose that the minimum size of the big carp in the lake fishing is 200 mm in length and weighs 100 grams. It is also suggested that a ban should be imposed for one month during the annual reproductive season from May to June.