汀江似鮈(Pseudogobio vaillanti)生态环境和繁殖特性的调查

2014—2015年对宣成到官庄境内似鮈生活的汀江河段进行实地考察和采样,结果表明该江段水温、溶解氧和pH分别在17.2~28.5℃、7.03~8.63 mg/L和6.75~6.83之间变化;似鮈喜欢栖息多砾石或沙石的环境,一般隐蔽在石缝里。汀江似鮈每年4—7月为繁殖期,产卵盛期为5—6月;性成熟年龄为1~2龄,体重在8.1~56.3 g之间;雌鱼怀卵量为213~550粒/尾,相对繁殖力为20~120粒/g·体重,成熟系数为1.07%~8.37%,雄鱼成熟系数为0.41%~4.85%;产沉性卵,深黄色,卵径为(0.762±0.015)mm。产卵场水深约1.5~2.5 m,溶解氧为7.85~8.41 mg/L,水温为18.6~26.7℃,pH在6.8~7.2之间,底质以沙砾为主。

Ecological environment and reproductive characteristics of Pseudogobio vaillanti in the Tingjiang River

Field investigation and random sampling were carried in Tingjiang River from Yanggu of Changting to Guanzhuang of Shanghang in 2014-2015.The results showed that the water temperature,dissolved oxygen and pH were varied from 17.2 to 28.5℃,7.03 to 8.63 mg/L and 6.75 to 6.83 in the year,respectively.Pseudogobio vaillanti likes inhabiting in gravel or sand,and generally hiddening in a crevice.The breeding period was from April to July,and spawning period was from May to June.The sexual maturity age was 1~2 ages,whose body weight was 8.1~56.3 g.The fecundity was 213 to 550 eggs/individual,and the relative fecundity was 20~120 grain /g body weight and its maturity coefficient was 1.07%~8.37%.The male maturity coefficient was 0.41%~4.85%.Its demersal egg was deep yellow in color and had a diameter of(0.762±0.015)mm.The water depth was 1.5~2.5 m in spawning site with water temperature of 18.6~26.7℃,pH 6.8~7.2 and gravel bottom.