江苏南部溪流司氏䱀生长特性的初步研究

THE GROWTH CHARACTERISTICS OF LIOBAGRUS STYANI IN STREAMS OF SOUTHERN JIANGSU PROVINCE

    摘要
  • 摘要: 2017年1月至2019年4月于江苏南部溪流水域采集司氏䱀(Liobagrus styani)样本221尾, 利用脊椎骨分析法对司氏䱀的年龄与生长进行了初步研究。结果表明, 司氏䱀渔获物年龄组成为1—5龄, 以2—3龄个体为主, 占总样本量的71.85%。体长分布范围为32.09—104.02 mm, 优势组60—90 mm。体长与脊椎骨外径关系为L = 22.134R+34.551, 体长与体重关系为W = 3×10–5L2.836, von Bertalanffy生长方程为: Lt=108.451–e–0.1330(t+3.8058), Wt=17.741–e–0.1330(t+3.8058)2.836。生长拐点年龄为4.04龄, 拐点年龄时对应体长、体重分别为Li=70.22 mm和Wi=5.17 g。研究首次在江苏南部水域采集到司氏䱀, 并首次报道了年龄结构和生长特征, 为其资源保护提供了基础资料。

     

    Abstract: Studying the age structure and growth characteristics of fish not only elaborates the basis of biological research, but also has important significance for the conservation and restoration of fish germplasm resources. Liobagrus styani has been reported to distribute in the middle and lower reaches of the Yangtze River. But there is no detailed report on its distribution. Based on the first discovery for its distribution in Jiangsu Province by the fishery resource survey, it is urgent to study the basic biological characteristics of L. styani. A total of 221 L. styani were collected from streams of Southern Jiangsu Province using handheld pulse sampling device from January 2017 to April 2019, and 105 L. styani were released into the streams. The age structure of L. styani was analyzed with the vertebrae identification. The relative growth rate, instantaneous growth rate, growth constant, growth index were calculated. The results showed that the L. styani vertebrae were irregular, and the annual vertebrae rings clearly stained with alizarin red dye liquor. The age of L. styani ranged from 1 to 5 years, and the fishes between 2 to 3 years were dominant, accounting for 71.85%. Their average length and weight were (72.64±9.15) mm and (5.88±2.25) g, respectively. The fitting equation of the relationship between the length (L) and the external diameter of vertebra (R) was L=22.134R+34.551, and the fitted relationship between the weight (W) and length (L) was W = 3×10–5L2.836. The von Bertalanffy growth equations of the L. styani were Lt=108.45 1–e–0.1330 (t+3.8058) and Wt=17.74 1–e–0.1330 (t+3.8058)2.836, respectively. The inflexion age of growth was 4.04 a, and the corresponding length and weight were 70.22 mm and 5.17 g, respectively. It can be inferred that when facing high fishing intensity, it was easier to show signs of resource reduction than other fish in streams, and the recovery time of population resources was longer. This study has important value to give reference for protection and resource recovery of L. styani.

     

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