Weight-length relationships and Fulton's condition factors of skipjack tuna (Katsuwonus pelamis) in the western and central Pacific Ocean

文献类型： 外文期刊

第一作者： Jin, Shaofei

作者： Jin, Shaofei;Jin, Shaofei;Jin, Shaofei;Zhang, Heng;Fan, Wei;Yan, Xiaodong

作者机构：

关键词： Skipjack tuna;Condition factor;Weight-length relationship;Western and central Pacific Ocean;Purse seine fishery

期刊名称：PEERJ （ 影响因子：2.984； 五年影响因子：3.369 ）

ISSN： 2167-8359

年卷期： 2015 年 3 卷

页码：

收录情况： SCI

摘要： 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.

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