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TIBURONES Y RAYAS (SUBCLASE ELASMOBRANCHII) DESCARTADOS POR LA FLOTA DE ARRASTRE CAMARONERO EN EL CARIBE DE COLOMBIA

2007; National University of Colombia; Volume: 12; Issue: 2 Linguagem: Inglês

1900-1649

Kelly Acevedo, Jimena Bohórquez-Herrera, Fabián Moreno, Cristina Jiménez Moreno, E. Molina, Marcela Grijalba-Bendeck, Paúl Gómez-Canchong,

Business, Innovation, and Economy

In order to have an approximation to the cartilaginous fishes assemblage structure exploited by commercial shrimp trawlers from the north coast of Colombia, composition and abundance of the discarded sharks and rays on two zones of the Colombian Caribbean, between August and November of 2004 were evaluated. Each month, a number of trawls were analyzed in each zone (north: La Virgen and Portete; south: Baru, Cabo Tiburon, Cascajal, Cispata, Morrosquillo, Ceycen, Mestizo, Cedro river, Tigua and Tortuguilla). Observers were placed on board commercial shrimp trawlers, sampling 1/5 from the total capture, previously homogenized, which was randomly taken from one of the four nets of the vessel. Within 30 trawls, there were 47 cartilaginous fishes registered, belonging to six families and eight species. The largest capture per effort unit (CPUE) in biomass was registered on September in both zones, whereas the smallest happened on November in the south one. The greatest value in number of units was in September within the south zone and the opposite occurred in November, registering the smallest values. This could explain the great availability of the objective resource, directly associated with the heavier rainy season that enriches the waters of the coastal environment and characterizes the region, probably used as habitat and feeding grounds for the cartilaginous fishes. Key words: Elasmobranchs, sharks, rays, shrimp trawl fishery.