Population structure and stock assessment of Hoplias malabaricus (Characiformes: Erythrinidae) caught by artisanal fishermen in river-reservoir transition area in Brazil

Luís Costa Novaes, José; Daniel Carvalho, Edmir

dc.creator	Luís Costa Novaes, José
dc.creator	Daniel Carvalho, Edmir
dc.date	2010-04-22
dc.date.accessioned	2016-05-03T15:29:08Z
dc.date.available	2016-05-03T15:29:08Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/3179
dc.identifier	10.15517/rbt.v59i1.3179
dc.identifier.uri	https://hdl.handle.net/10669/26614
dc.description	Hoplias malabaricus is a viable economic alternative for artisanal fishermen who used to live on the banks of rivers that now are dammed in Brazil. In order to preserve the species? natural stock, the main objectives of this study were to obtain bio-ecological information on this species reproduction, feeding dynamics and the description of the extent of its exploitation in river-reservoir transition area in Brazil. This way, from January to December 2005, different fishery catches were made with gill nets by artisanal fishermen, and a total of 426 individual H. malabaricus were obtained and sampled. From each specimen, the following biometric and biological data were analyzed: standard length, total weight, stomach contents, reproductive data such as sex, weight and gonadal maturation stage; with these data we estimated sex ratio, reproduction period and feeding habits. To assess growth parameters and infer on the degree of exploitation, the standard length frequency data were analysed using the FISAT (ELEFAN I) computer program. Data revealed a sex ratio of 0.8:1 (M:F), that reproduction occurs all year around, being more intense during spring and summer; it also showed that H. malabaricus is piscivorous. The growth parameters and mortality were estimated at: L8=35.18cm, k=0.32 year, longevity=9.3 years, Z=1.25 years, M=0.63 year and F=0.62 year. The weight-length relationship was: ln Wt=?3.1663+2.7456 ln Lp. The yield-per-recruit analysis produced the following values: E=0.496, Emax=0.916, E0.1=0.701 and E0.5=0.378. Overall, our data suggest that the stock of H. malabaricus is not yet overfished in the studied area. Rev. Biol. Trop. 59 (1): 71-83. Epub 2011 March 01.	en-US
dc.format	application/pdf
dc.language	eng
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2014 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 59 (1) March 2011	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 59 (1) March 2011	es-ES
dc.source	Revista Biología Tropical; Vol. 59 (1) March 2011	pt-PT
dc.source	2215-2075
dc.source	0034-7744
dc.source	10.15517/rbt.v59i1
dc.title	Population structure and stock assessment of Hoplias malabaricus (Characiformes: Erythrinidae) caught by artisanal fishermen in river-reservoir transition area in Brazil	en-US
dc.title	Population structure and stock assessment of Hoplias malabaricus (Characiformes: Erythrinidae) caught by artisanal fishermen in river-reservoir transition area in Brazil	es-ES
dc.type	artículo original
dc.coverage	CRC	en-US

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