衡水湖红鳍原鲌的年龄、生长和繁殖特性研究

Study on the age,growth and reproductive characteristics of Cultrichthys erythropterus in Hengshui Lake

为研究衡水湖红鳍原鲌(Cultrichthys erythropterus)的年龄、生长和繁殖特性,在衡水湖采集261尾红鳍原鲌,测定其年龄、体长、体重、性腺发育时期、性腺重等。结果表明,衡水湖红鳍原鲌的2~3龄为优势龄组,从4月份开始,随着气温的逐渐回升,平均年龄呈现出缓慢上升的趋势,到6月份达到了最高,为1.95,之后从7月份开始又逐渐降低。红鳍原鲌的体长范围为76~238 mm,均值为119 mm;体重范围为5.5~113.1 g,均值为24.6 g。红鳍原鲌的雌性个体为正异速生长,雄性个体为负异速生长。红鳍原鲌的雌雄种群性比为0.903∶1,体长150 mm以下种群,雄性个体占据优势(雌雄比0.87∶1);体长150 mm以上的种群,雌性个体占据优势(雌雄比1.36∶1)。衡水湖红鳍原鲌的繁殖期为4—9月,主要集中在6—7月。卵径范围为0.30~1.20 mm,主要集中在0.60~1.00 mm,根据卵径的变化趋势推测其产卵类型为分批产卵。

To study the age,growth and reproductive characteristics of the redfin culter Cultrichthys erythropterus in Hengshui Lake,261 fish were collected from Hengshui Lake,and their age,body length,body weight,gonad development period and gonad weight were determined.The results showed that the 2~3 age group of C.erythropterus in Hengshui Lake was dominant.The average age of C.erythropterus gradually increased from April,reached the highest value(1.95)in June,and decreased from July.The body length of C.erythropterus ranged from 76~238 mm with an average of 119 mm.And the body weight ranged from 5.5 to 113.1 g,with a mean of 24.6 g.The female of C.erythropterus exhibited positive allometry and the male exhibited negative allometry.The sex ratio of male to female of C.erythropterus was 0.903∶1,and the male was dominant in the population below 150 mm(male to female ratio 0.87∶1).In a population of above 150 mm in length,females were dominant(male to female ratio 1.36∶1).The breeding period of C.erythropterus in Hengshui Lake was from April to September,mainly concentrated in June to July.The egg diameter ranged from 0.30 to 1.20 mm,mainly concentrated in 0.60 to 1.00 mm.According to the variation trend of egg diameter,it was inferred that the egg laying type of C.erythropterus was batch laying.