Shark-catch composition and seasonality in the data-poor small-scale fisheries of the southern Gulf of Mexico
Juan Carlos Pérez-Jiménez A , Armando Wakida-Kusunoki B , Chrystian Hernández-Lazo C and Manuel Mendoza-Carranza
C D
+ Author Affiliations
- Author Affiliations
A El Colegio de la Frontera Sur-ECOSUR, Unidad Campeche, Human Adaptation and Tropical Ecosystem Resources Management Research Group, Avenida Rancho Polígono 2-A, Colonia Ciudad Industrial, 24500, Lerma Campeche, Campeche, Mexico.
B Instituto Nacional de Pesca, Centro Regional de Investigación Pesquera de Yucalpetén, Carretera a Chelem, Boulevard del Pescador, 97320, Yucalpetén, Yucatán, Mexico.
C El Colegio de la Frontera Sur – ECOSUR, Unidad Villahermosa, Sustainable Management of Basin and Coastal Zone Research Group, Carretera a Reforma Kilometro 15.5, Rancheria Guineo 2a, 86280, Villahermosa, Tabasco, Mexico.
D Corresponding author. Email: mcarranza@ecosur.mx
Marine and Freshwater Research 71(9) 1182-1193 https://doi.org/10.1071/MF19184
Submitted: 19 May 2019 Accepted: 5 December 2019 Published: 11 February 2020
Abstract
Regional ecological information is relevant to the international management of vulnerable species such as sharks. On the basis of monthly fishery data (2007–2010) from two small-scale multispecies fleets, namely, the bottom longline fleet (MLL) and vertical line+shark-specific longline fleet (VL+SSL) operating on the Campeche Bank, we recorded 19 shark species. The occurrence of immature stages of 15 species, gravid females of Carcharhinus leucas, three Endangered species (Sphyrna mokarran, S. lewini, Isurus oxyrinchus) and three Vulnerable and six Near-threatened species emphasises the importance of this area. Rhizoprionodon terraenovae (42.01% of total abundance), S. lewini (24.82%) and S. tiburo (14.57%) were the most abundant species. The commercial logbooks (2007–2012) for one fleet recorded 6517 for MLL and 1617 for VL+SSL fishery trips. The general additive model indicated a maximum of shark catch rate (CR) for MLL and SSL during 2011 (mean ± s.e., 49.94 ± 8.44 and 91.38 ± 16.07 kg per 100 hooks respectively). Monthly CR for MLL was highly variable; the maximum was observed in February (15.45 ± 21.43 kg per 100 hooks), the maximum monthly CR for SSL was in January (88.04 ± 14.85 kg per 100 hooks). For MLL, a positive relation was observed between effort and CR, whereas, for SSL, no clear relation was observed.
Additional keywords: bottom longline, Campeche Bank, Carcharhinus leucas, closed season, multispecies fishery, shark catch trends, shark nursery.
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