舟山本岛南部附近海域春季渔业资源调查

目的]对舟山本岛南部附近海域春季渔业资源进行调查。方法]依据2014年4月舟山本岛南部附近海域渔业资源调查资料,研究舟山本岛南部附近海域鱼类密度的时空分布,分析优势种、生物多样性等因素对鱼类分布的影响。结果]调查水域共鉴定游泳动物23种,隶属6目16科。其中,鱼类8种,占总种类数的34.78%,占渔获物总重量的80.08%。渔获物尾数组成以虾类为主,占渔获物总尾数的61.26%。拖网调查海域优势种为凤鲚、安氏白虾、日本鼓虾、鮸鱼、红狼牙虾虎鱼。渔业资源平均重量密度为93.365 kg/km2,平均尾数密度为7.265万尾/km2。虾类是调查海域的渔业资源重量和尾数密度最大种类。蟹类头足类在重量和尾数方面比例小。调查海域的12个站位多样性指数均小于2,个别站位小于1,总体而言调查海域游泳多样性指数和丰度指数偏低,均匀度分布水平低。结论]研究结果可为舟山本岛南部附近海域的生态环境评价和海洋资源可持续利用提供科学依据。

Investigation on Fishery Resources in the Surrounding Waters of South Zhoushan Island in Spring

Objective] To investigate fishery resources in the surrouding waters of south Zhoushan Island in spring.Method]Based on the inves-tigation data of fishery resources in the surrounding waters of south Zhoushan Island in April of 2014,we discussed the spatial-temporal distribu-tion of fish density,and the impact of the dominant species,biodiversity and other factors on distribution of fish.Result]There were 23 species of swimming animals,belonging to 16 families,6 orders.8 species of fish were identified ,accounting for 34.78%of the total species and 80.08%of the weight of the catches.The shrimp took the absolute advantage,accounting for 61.26% of the total catches.Coilia mystus, Exopalaemon an-nandalei, Alpheus japonicas, Miichthys miiuy, Odontamblyopus rubicundus were the dominant species in the survey area.The average density of fishery resources was 93.365 kg/km2 ,and the arerage density of mantissa was 72.65 ×103 ind./km2 .Shrimp was the largest type in the weight of fishery resources and mantissa density in the survey area.The proportions of crabs and cephalopods were small in that.The diversity index of 12 stations were less than 2,and that of a few of stations were less than 1 in the survey area.In general,the swimming diversity index ,abundance in-dex,and the distribution of uniformity were all low in the survey area.Conclusion]The research results could provide scientific basis for the eco-logical environment evaluation and the sustainable utilization of marine resources in surrouding waters of south Zhoushan Island.