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Standardizing CPUE of Ommastrephes bartramii for Chinese squid-jigging fishery in Northwest Pacific Ocean

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Abstract

Generalized linear models (GLM) and generalized additive models (GAM) were used to standardize catch per unit fishing effort (CPUE) of Ommastrephes bartramii for Chinese squid-jigging fishery in Northwest Pacific Ocean. Three groups of variables were considered in the standardization: spatial variables (longitude and latitude), temporal variables (year and month) and environmental variables, including sea surface temperature (SST), sea surface salinity (SSS) and sea level height (SLH). CPUE was treated as the dependent variable and its error distribution was assumed to be log-normal in each model. The model selections of GLM and GAM were based on the finite sample-corrected Akaike information criterion (AICC) and pseudo-coefficient (Pcf) combined P-value, respectively. Both GAM and GLM analysis showed that the month was the most important variable affecting CPUE and could explain 21.3% of variability in CPUE while other variables only explained 8.66%. The interaction of spatial and temporal variables weakly influenced the CPUE. Moreover, spatio-temporal factors may be more important in influencing the CPUE of this squid than environmental variables. The standardized and nominal CPUEs were similar and had the same trends in spatio-temporal distribution, but the standardized CPUE values tended to be smaller than the nominal CPUE. The CPUE tended to have much higher monthly variation than annual variations and their values increased with month. The CPUE became higher with increasing latitude-high CPUE usually occurred in 145°E–148°E and 149°E–162°E. The CPUE was higher when SST was 14–21°C and the SLH from −22 cm to −18 cm. In this study, GAM tended to be more suitable than GLM in analysis of CPUE.

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Authors and Affiliations

  1. College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China

    Siquan Tian  (田思泉), Xinjun Chen  (陈新军), Liuxiong Xu  (许柳雄) & Xiaojie Dai  (戴小杰)

  2. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai, 201306, China

    Siquan Tian  (田思泉), Xinjun Chen  (陈新军), Yong Chen  (陈勇), Liuxiong Xu  (许柳雄) & Xiaojie Dai  (戴小杰)

  3. Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, Shanghai, 201306, China

    Siquan Tian  (田思泉), Xinjun Chen  (陈新军), Yong Chen  (陈勇), Liuxiong Xu  (许柳雄) & Xiaojie Dai  (戴小杰)

  4. School of Marine Sciences, University of Maine, Orono, ME, 04469, USA

    Siquan Tian  (田思泉) & Yong Chen  (陈勇)

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  1. Siquan Tian  (田思泉)
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Correspondence to Xinjun Chen  (陈新军).

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Supported by the Program for New Century Excellent Talents in University (No. NCET-06-0437), the National High Technology Research and Development Program of China (863 Program) (No. 2007AA092201; 2007AA092202), Shanghai Leading Academic Discipline Project (No. S30702), and Doctorship Fund of Shanghai Ocean University (No. 06-326)

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Tian, S., Chen, X., Chen, Y. et al. Standardizing CPUE of Ommastrephes bartramii for Chinese squid-jigging fishery in Northwest Pacific Ocean. Chin. J. Ocean. Limnol. 27, 729–739 (2009). https://doi.org/10.1007/s00343-009-9199-7

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  • DOI: https://doi.org/10.1007/s00343-009-9199-7

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