Evaluation of the selectivity of gillnets and handlines for the capture of the blue runner (Caranx crysos) in areas of marine influence of the Tayrona National Natural Park
DOI:
https://doi.org/10.25268/bimc.invemar.2020.49.SuplEsp.1074Keywords:
selectivity, gillnet, handline, Caranx crysos, Caribbean Sea of ColombiaAbstract
A greater knowledge of the selectivity of fishing gear allows determining the capacity to select the sizes and shapes of the species caught, in addition to providing useful information for their conservation and use. This study determined the selectivity parameters of gillnets (7.0, 7.6 and 10.2 cm of mesh size) and J hooks (n.° 7, 9 and 10), used in the artisanal catches of the blue runner (Caranx crysos), in different fishing sites in the Santa Marta region. The Select method was used to determine the selectivity parameters, while the Kurskall-Wallis test was used to evaluate differences in the catch per unit of effort (CPUE) between the mesh sizes and the evaluated hook gauges. The results demonstrate that the log-normal model better describes the selectivity of gillnets and hand lines for C. crysos. The modal lengths calculated with this model were 23.00, 25.09 and 33.46 cm for the mesh sizes 7.0, 7.6 and 10.2 cm while 23.72, 30.49 and 33.88 cm were calculated for hooks n.° 7, 9 and 10, respectively. The application of these results, considering a maturity size of 35 cm, for an eventual management measure of the blue runner fishery, must also consider that the CPUE showed statistical differences between mesh sizes and hook gauges, which could affect the fisherman’s short-term income.
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