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Wang X.-F.,Shanghai Ocean University | Xu L.-X.,Shanghai Ocean University | Xu L.-X.,Ministry of Education Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources | Xu L.-X.,Shanghai Higher Education Commission Key Laboratory of Oceanic Fisheries Resources Exploitation | And 4 more authors.
Chinese Journal of Applied Ecology | Year: 2010

Fish age and growth are the important biological parameters for the assessment of fishery resources. With the help of purse seiners, 262 individuals of skipjack tuna (Katsuwonus pelamis) were sampled from western and central Pacific Ocean in October 2007-January 2008. The measurements in situ showed that the fork length of the samples ranged from 278 to 746 mm, and their body mass ranged from 345 to 9905 g. The first dorsal spine of each individual was collected for age identification and growth parameters estimation. The relationship between fork length (L, mm) and body mass (M, g) was expressed as M=3.612 × 10 -6L 3.278 (R 2 =0.9782), and no significant difference was found for the males and females (F =2. 002, P>0. 05). A comparison with Akaike information criterion (AIC) suggested that among power regression equation, linear regression equation, and exponential regression equation, linear regression equation was most suitable for describing the relationship between fork length and spine radius (AIC =2257.4). The mean back-calculated fork lengths of K. pelamis with the ages of 1-5 estimated by Fraser-Lee's method were 398.4, 494.2, 555.4, 636.8, and 728.8 mm, respectively. Residual analyses indicated that there was no significant difference in the growth of male and female K. pelamis (F = 0. 670 ; df = 182; P>0. 05). The sex-combined von Bertalanffy growth equation of K. pelamis was L t =706. 51 (1-e -0.64(t+0.037). Source


Wang X.-F.,Shanghai Ocean University | Zhu G.-P.,Shanghai Ocean University | Zhu G.-P.,Ministry of Education Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources | Zhu G.-P.,Shanghai Higher Education Commission Key Laboratory of Oceanic Fisheries Resources Exploitation | And 6 more authors.
Chinese Journal of Applied Ecology | Year: 2012

Tuna prefers to aggregate around floating objects. Based on this behavioral characteristic, people developed fish aggregation devices(FADs) to trap tuna, and made the catch and fishing efficiency of tuna purse seine fisheries improved greatly. However, there still exist uncertainties whether the FADs can attract tuna and what's the potential impact of widely applying FADs in tuna purse seine fishery on tuna resources and oceanic pelagic ecosystem. Aiming at these uncertainties, scientists conducted a great deal experiments to study the behavioral biology of tuna around FADs. This paper reviewed the related classic and more credible experiments in the past 30 years, and summed up five behavioral patterns of the tunas around drifting and anchored FADs, i. e., tropism behavior, schooling behavior, association behavior, feeding behavior, and vertical movement pattern. The related main research methods currently in use were introduced, and the issues on this subject needed to be paid great attention to were discussed. Source

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