Assessing Atlantic sailfish catch rates based on Brazilian sport fishing tournaments (1996-2014)
DOI:
https://doi.org/10.20950/1678-2305.2016v42n3p625Keywords:
catch per unit effort (CPUE), billfishes, generalized linear model, tweedie distributionAbstract
In the present study, a generalized linear model (GLM), assuming a Tweedie distribution and log as link function, was used to generate a standardized catch per unit effort (CPUE) series for the sailfish caught by sport fishing boats based in São Paulo, Rio de Janeiro, Espírito Santo and Bahia States, from 1996 to 2014. The response variable was the number of sailfish caught per number of boats registered in the tournament per day. The following factors were tested in the analyses: "year" "month" and "local" representing the main effects of the explanatory variables. The overall pattern of the standardized catch rate indicates a relatively stable trend with a slight decline in the recent years, from 2009 to 2014.
References
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AMORIM, A.F. and ARFELLI, C.A. 2001 Analysis of the Santos fleet from São Paulo, Southern Brazil (1971-1999). Collective Volume of Scientific Papers, 53: 263-71.
AMORIM, A.F. and SILVA, B.O. 2005 Game fisheries off São Paulo State coast, in Brazil (1996- 2004). Collective Volume of Scientific Papers 58(5): 1574-1588.
AMORIM, A.F.; ANDRADE, H.A.; LINS, J.E. 2006 Assessment of billfish abundance based on Brazilian sport fishing catches. Bulletin of Marine Science, 79: 659-666.
AMORIM, A.F. and ARFELLI, C.A. 1984 Estudo biológico pesqueiro do espadarte, Xiphias gladius Linnaeus, 1758, no sudeste e sul do Brasil (1971 a 1981). Boletim do Instituto de Pesca, 11(único): 35-62.
ARFELLI, C.A., AMORIM, A.F., GRAí"¡A-LOPES, R., 1994 Billfish sport fishery off Brazilian coast. Collective Volume of Scientific Papers, 41: 214-217.
DUNN, P.K. 2011 Tweedie exponential family models. R package version 2.1.1. DUNN, P.K. and SMYTH, G.K. 1996 Randomized quantile residuals. Journal of Computational and Graphical Statistics, 5: 236í 244.
FRÉON, P. and MISUND, O.A. Dynamics of pelagic fish distribution and behaviour: effects on fisheries and stock assessment. First Edition, Science, B.S. Fishing News Books, Oxford, 1999. 348p.
GULLAND, J.A. Fish stock assessment: a manual of basic methods. FAO/Wiley Ser. on Food and Agriculture, vol. 1, 1993. 233p.
MAUNDER, M.N. and PUNT, A.E. 2004 Standardizing catch and effort data: a review of recent approaches. Fisheries Research, 70: 141-159.
MOURATO, B.L.; AMORIM, A.F.; ARFELLI, C.A; HAZIN, H.G.; HAZIN, F.H.V.; LIMA, C.W. 2009a Standardized CPUE of atlantic sailfish (Istiophorus platypterus) caught by recreational fishery in southern Brazil. Collective Volume of Scientific Papers, 64: 1941-1950.
MOURATO, B.L.; PINHEIRO, P.; HAZIN, F.H.V.; MELO, V.B.; AMORIM, A.F.; PIMENTA, E.; GUIMARíES, C. 2009b Preliminary analysis of gonadal development, spawning period, sex ratio and length at first sexual maturity of sailfish, Istiophorus platypterus in Brazilian coast. Collective Volume of Scientific Papers, 64: 1927-1940.
MOURATO, B.L.; HAZIN, F.H.V..; BIGELOW, K.; MUSYL, M.; CARVALHO, F.; HAZIN, H. 2014 Spatio-temporal trends of sailfish, Istiophorus platypterus catch rates in relation to spawning ground and environmental factors in the equatorial and southwestern Atlantic Ocean. Fisheries Oceanography, 23 (1): 32-44.
NAKAMURA, I. FAO species catalogue. Vol. 5: Billfishes of the world. An annotated and illustrated catalogue of marlins, sailfishes, spearfishes and swordfishes known to date. FAO Fish. Synop., Rome, n. 125, 1985. 65p.
R CORE TEAM. 2014 R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. URL http://www.R-project.org/.
SHONO, H. 2008 Application of the Tweedie distribution to zero-catch data in CPUE analysis. Fisheries Research 93: 154í 162.
WOR, C.; Mourato, B.L.; Hazin, H.G.; Hazin, F.H.V.; Travassos, P.; Andrade, H.A. 2010 Standardized catch rate of sailfish (Istiophorus platypterus) caught by Brazilian longliners in the Atlantic Ocean (1978-2008). Collective Volume of Scientific Papers, 65 -1762 - 1771.
ZUUR, A.F.; IENO, E.N.; SAVELIEV, A.A.; SMITH, G.M. Mixed effects models and extensions in ecology with R. 1st Edition, Springer, 2009. 574p.
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2016-09-30
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