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长江口沿岸碎波带刀鲚仔稚鱼摄食习性与浮游动物分布的相关性研究

DOI: 10.11870/cjlyzyyhj201509010, PP. 1507-1513

Keywords: 浮游动物,刀鲚仔稚鱼,摄食,影响

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Abstract:

为探明长江口沿岸碎波带浮游动物的分布与刀鲚仔稚鱼摄食的关系,2006年7~12月每月大潮期间在长江口沿岸碎波带设置13个站位点,用浮游Ⅰ型生物网(口径30cm,网目0.2mm)在表层拖曳采集浮游动物78次,采集到浮游动物72种,平均密度3278.95个/网;用小型拖网(1m×4m,网目1mm)拖曳234次,采集到刀鲚仔稚鱼37170尾,平均密度158.85尾/网。通过胃含物分析共鉴定刀鲚仔稚鱼饵料生物15种(类)(浮游动物11种,浮游幼体4类),平均摄食密度1.306个/尾。研究结果表明:前弯曲期仔鱼偏好摄食哲水蚤、剑水蚤和枝角类;弯曲期仔鱼偏好摄食猛水蚤和桡足类桡足幼体;后弯曲期仔鱼除偏好摄食桡足类幼体以外,也偏好摄食游泳能力较强的糠虾;稚鱼对糠虾有极强的偏好。水温和盐度对刀鲚仔稚鱼的摄食量影响较小;浮游动物分布并不直接影响刀鲚仔稚鱼分布,相关性较小。

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