Age and growth of Pacific saury (Cololabis saira )in the northwest Pacific Ocean based on statolith microstruture
According to the 168 samples of Cololabis saira on June and during October to November in 2014 collect-ed 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 549 d,the dominant age was from 231 d to 290 d and 381 d to 470 d.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 respec-tively was 0.224 mm/d and 0.00088,AGR decreased with age increasing.Mean AGR and G of body weight re-spectively was 0.293mm/dand 0.00325,the maximum AGR(0.504 mm/d)and G(0.00486)appeared 351 d to 400 d.
NETL
NSTL
万方数据
