基于耳石微结构的西北太平洋秋刀鱼(Cololabis saira)年龄与生长研究

Age and growth of Pacific saury (Cololabis saira) in the northwest Pacific Ocean based on statolith microstruture

根据2014年6月和10—11月在西北太平洋公海采集的168尾秋刀鱼样本,基于耳石微结构并结合基础生物学数据,鉴定了秋刀鱼的日龄,推算了孵化日期,并建立了生长模型和生长率。研究发现:耳石微结构从核心到透明区边缘,轮纹宽度由宽至窄,亮度由暗至明,标记轮多分布在透明区。日龄范围为204~549d,优势日龄组为231~290d和381~470d,日龄最小个体体长207mm,体质量39g,日龄最大个体体长291mm,体质量131g。孵化日期为2012年12月至2014年4月,孵化高峰期出现在1—3月和8—10月,初步推算秋刀鱼主要分为春生群和秋生群产卵群体。体长和体质量生长模型符合Logistic生长模型。体长平均绝对生长率和相对生长率别为0.224mm/d和0.000 88,绝对生长率随着日龄增加而减小。体质量平均绝对生长率和相对生长率别为0.293g/d和0.003 25,最大绝对生长率(0.504mm/d)和最大相对生长率(0.004 86)出现在351~400d。

According to the 168 samples of Cololabis sairaon June and during October to November in 2014 collected in the northwest Pacific Ocean.Age,hatch date and growth were obtained from statolith microstructure and combined with biological data.From the core to the transparent area edge,statolith increment width was from wide to narrow,brightness was from dark to bright,mark increment distributed in the transparent area.The range of age was from 204 d to 549d,the dominant age was from 231 d to 290d and 381 d to 470d.The minimum age was 204 d,its body length and body weight was 207 mm and 39 g.The maximum age was 549 d,its body length and body weight was 291 mm and 131 g.The hatch date was December 2012 to April 2014,peak hatching dates were distributed in the months of January to March and August to October.Spawning groups was observed in spring and autumn spawning groups.The body length and weight growth model was suitable for Logistic growth model.Mean absolute daily growth rate（AGR） and instantaneous relative growth rate（G）of body length respectively was 0.224mm/d and 0.000 88,AGR decreased with age increasing.Mean AGR and G of body weight respectively was 0.293mm/d and 0.003 25,the maximum AGR（0.504mm/d） and G（0.004 86） appeared 351d to 400 d.