Blue whiting ( Micromesistius poutassou ) sex ratio, size distribution and condition patterns off Portugal
Blue whiting ( Micromesistius poutassou ) sex ratio, size distribution and condition patterns off Portugal
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葡萄牙沿海蓝鳕鱼 (Micromesistius poutassou) 的性别比例、体型分布和状况模式
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发表时间：
2017
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通讯作者：
H. Cabral
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作者：
Patrícia Gonçalves;A. A. Melo;A. Murta;H. Cabral
性比是自然种群的一个重要特征，也是评估捕捞鱼类种群繁殖潜力和种群状况的一个关键参数。在渔业研究中，关于空间和时间性别比例变化的知识可以为种群支持开发和环境变化的能力提供信息。蓝鳕鱼（Micromesistius poutassou）在成熟后表现出性生长二型性，雌性比雄性长。这项工作的主要目标是调查季节性模式的蓝鳕鱼性别分布，大小结构和条件在三个地区沿着葡萄牙海岸（北部，西南部和南部），根据底拖网调查在1998年和2015年之间的秋季和冬季进行。较小的蓝鳕鱼（12-24厘米）分布在250-300米的浅水区，而较大的个体（>24厘米）分布在400-500米的深水区。条件因子富尔顿K在所有区域（F = 11.72; p值= 6.14; p值2（1）= 4.38，p = 0.03）和不同深度（χ 2（1）= 4.73，p = 0.03）的季节之间存在显著差异。因此，这项研究揭示了季节性和深度变化的蓝色鳕鱼性别比例沿着葡萄牙海岸。
The sex ratio is an important trait of natural populations and a key parameter for assessing the reproductive potential and stock status of exploited fish populations. In fisheries research, knowledge on spatial and temporal sex ratio variation can inform on the capacity of a population to support exploitation and environmental changes. Blue whiting (Micromesistius poutassou ) shows sexual growth dimorphism after maturation, with females achieving greater lengths than males. The main goal of this work was to investigate seasonal patterns in the blue whiting sex distribution, size structure and condition in three areas along the Portuguese coast (north, southwest and south), based on bottom trawl surveys performed in autumn and winter between 1998 and 2015. Smaller blue whiting (12–24 cm) were found in shallow areas down to 250–300 m while larger individuals (>24 cm) were spread deeper down to 400–500 m. Condition factor Fulton K differed significantly between seasons in all the areas (F = 11.72; p -value = 6.14; p -value 2 (1) = 4.38, p = 0.03) and across depths (χ 2 (1) = 4.73, p = 0.03). Thus, this study revealed seasonal and depth variations in the blue whiting sex ratio along the Portuguese coast.