Jin Shaofei, Yan Xiaodong, Zhang Heng, Fan Wei
Key Laboratory of Regional Climate-Environment for Temperate East Asia (RCE-TEA), Chinese Academy of Sciences , Beijing , China ; University of Chinese Academy of Sciences , Beijing , China ; Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, P. R. China (East China Sea fisheries Research Institute, Chinese Academy of Fishery Sciences) , Shanghai , China.
State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University , Beijing , China.
PeerJ. 2015 Feb 12;3:e758. doi: 10.7717/peerj.758. eCollection 2015.
This paper describes the weight-length relationships (WLRs) and Fulton's condition factors (K) of skipjack tuna (Katsuwonus pelamis) in purse seine fisheries from three cruises in the western and central Pacific Ocean (WCPO): August-September 2009 (AS09), November-December 2012 (ND12), and June-July 2013 (JJ13). The fork length and weight of a total of 1678 specimens were measured. The results showed that the fork length of more than 70% of specimens was below 60 cm (76% in AS09, 87% in ND12, and 73% in JJ13). The coefficient b in the combined sex group was 3.367, 3.300 and 3.234 in JJ13, AS09 and ND12, respectively. The b values of WLRs when fork length was >60 cm were significantly less than 3 (P = 0.062), but when fork length was <60 cm they were significantly greater than 3 (P = 0.028). The K value ranges of JJ13, AS09 and ND12 in different fork length groups were 1.3-1.84 (1.62 ± 0.18), 1.57-2.02 (1.86 ± 0.15), and 1.44-1.78 (0.65 ± 0.13), respectively. Moreover, K values in different fork length classes for each cruise had one turning point: 60-65 cm for JJ13; 60-65 cm for ND12; and 55-60 cm for AS09. The results of this study provide basic information on the WLRs and K values of skipjack tuna in different seasons and growth phases in the WCPO, which are useful for fishery biologists and fishery managers.
本文描述了在西太平洋和中太平洋（WCPO）的三次金枪鱼围网捕捞作业中，鲣鱼（Katsuwonus pelamis）的体重-体长关系（WLRs）和福尔顿丰满度系数（K），这三次捕捞作业分别为：2009年8月至9月（AS09）、2012年11月至12月（ND12）以及2013年6月至7月（JJ13）。共测量了1678个样本的叉长和体重。结果表明，超过70%的样本叉长低于60厘米（AS09中为76%，ND12中为87%，JJ13中为73%）。在合并性别组中，系数b在JJ13、AS09和ND12中分别为3.367、3.300和3.234。当叉长>60厘米时，WLRs的b值显著小于3（P = 0.062），但当叉长<60厘米时，b值显著大于3（P = 0.028）。JJ13、AS09和ND12在不同叉长组中的K值范围分别为1.3 - 1.84（1.62±0.18）、1.57 - 2.02（1.86±0.15）和1.44 - 1.78（0.65±0.13）。此外，每次捕捞作业中不同叉长类别的K值都有一个转折点：JJ13为60 - 65厘米；ND12为60 - 65厘米；AS09为55 - 60厘米。本研究结果提供了WCPO不同季节和生长阶段鲣鱼的WLRs和K值的基本信息，对渔业生物学家和渔业管理人员很有用。
