基于张网渔业休渔前后的黄茅海河口渔业资源群落比较

Comparison on resources community of stow-net fishery before and after fishing off season in Huangmaohai Estuary

  • 摘要: 根据2015年休渔前后(春季和夏季)利用张网在黄茅海河口获得的渔业资源调查资料,应用数量生物量比较曲线和生物量谱方法分析了其渔业资源群落状况。结果显示,调查共捕获渔获56种,其中鱼类47种,隶属于12目27科38属;甲壳类9种,隶属于2目5科7属。休渔前(春季)渔获种类大于休渔后(夏季),春季优势种为凤鲚(Coilia mystus)、红狼牙虎鱼(Odontamblyopus rubicundus)和脊尾白虾(Exopalaemon carinicauda);夏季优势种为凤鲚、康氏小公鱼(Anchoviella commersonii)和红狼牙虎鱼。春季渔业资源群落的数量优势度曲线与生物量优势度曲线相交,群落处于中度干扰状态;夏季其数量优势度曲线高于生物量优势度曲线,群落处于严重干扰状态。春夏两季数量生物量比较曲线(ABC曲线)中生物量和丰度的相对关系统计量W分别为-0.015和-0.046。从渔业资源群落的生物量谱来看,春季标准化生物量谱线性回归的斜率大于-1,生物量随着个体体质量的增加而增加;夏季其线性回归的斜率小于-1,生物量随着个体体质量的增加而减少。捕捞能够影响生物量谱,生物量谱斜率下降反映了休渔在过度捕捞下并没有达到预期效果。建议加大管理力度,增加捕捞限制条件。

     

    Abstract: Abundance-biomass comparison curve and biomass spectra methods were applied to analyze the data collected from stow-net fishery before and after fishing off season (spring and summer) in Huangmaohai Estuary so as to evaluate the status of fishery resources community. Fivty-six fishery species were collected during the surveys, including 47 fish species (12 orders, 27 families, 38 genera) and 9 crustacean species (2 orders, 5 families and 7 genera). The catch species in spring were more than that in summer. In spring, the dominant species were Coilia mystus, Odontamblyopus rubicundus and Exopalaemon carinicauda. In summer, the dominant species were C.mystus, Anchoviella commersonii and O.rubicundus. The k-dominance curves of abundance and biomass intersected in spring, and the W-statistic value was -0.015. But the k-dominance curve of abundance was above the biomass curve in summer with the W-statistic value of -0.046. This phenomenon indicates that the present resources community of stow-net fishery was disturbed moderately in spring, but disturbed seriously in summer. Furthermore, the slopes of normalized biomass spectra in spring were higher than -1, and the biomass increased with the increase of the average individual weight, but preferred the opposite in summer. The results indicate that fishing can affect the biomass spectra, and the fishing off season does not play an obviously positive role by the decline of the slope of biomass spectra under overfishing. To maintain the ecosystem health, management and restrictions must be imposed on the fishery.

     

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