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南海中南部长钻光鱼渔业生物学初步研究

Keywords: 南海,中层鱼类,长钻光鱼,渔业生物学,年龄,生长

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Abstract:

?根据2013年和2014年在南海中南部海域变水层拖网采集的长钻光鱼样品,对其体长和体质量组成、年龄和生长、性腺成熟度及摄食等级等生物学特征进行了初步研究。结果显示,150m水层长钻光鱼体长范围为80~128mm,优势体长组为80~100mm,占82.4%,平均体质量为2.40g;200m水层长钻光鱼体长范围为43~195mm,优势体长组为80~140mm,占76.9%,平均体质量为4.47g;400m水层长钻光鱼体长范围为86~186mm,优势体长组不明显,平均体质量为9.64g。渔获个体平均体长由浅到深呈增加趋势,由南到北呈先增加后减少趋势;均值分析t检验表明,150m、200m、400m水层长钻光鱼体长分布均呈极显著差异(p<0.01)。长钻光鱼春季平均体长和平均体质量分别为111mm和3.84g;秋季平均体长和平均体质量140mm和5.50g;冬季平均体长和平均体质量分别为134mm和7.44g。其生长参数b值为3.0726,符合等速生长特征。有效鉴定的45个长钻光鱼耳石样品中1龄鱼35个,1+龄鱼10个;年龄最小为6个月,体长为128mm;年龄最大为16个月,体长为187mm。其性腺成熟度以ⅰ期和ⅱ期为主,春季性腺成熟度最高。其摄食等级以0级和1级为主,最高为3级,不同水层长钻光鱼的摄食等级无显著差异。

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