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Browsing by Author "Altamar, Jairo"

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    Incorporación de ventanas de escape en nasas para jaiba, Ciénaga Grande de Santa Marta, Colombia
    (Corporación Universitaria Lasallista, Editorial Lasallista., 2018) Asencio, Claudeth; Altamar, Jairo; Erzini, Karim
    Introduction. The crab fishery in Cienaga Grande from Santa Marta is subject to strong pressure on immature individuals, which has led to overfishing. Objective. The dimension and location of escape gaps was determined so that the unwanted sizes could exit. Material and methods. From video recordings, the behavior and sites of preference of the crab were studied. The size of the gap was estimated using the following morphometric relationships: carapace width at base of lateral spines (ABEL) vs carapace length and ABEL vs body height. To establish statistical differences between the captured sizes and the catch per unit effort (CPUE) of traps with or without gaps, the MannWhitney W test was used. Results. The relationships were explained by a linear relationship according to the equations: Lc=0.5938*ABEL+0.3102 and Alt=0.3094*ABEL+0.2934. The ABEL corresponding to the maturity size was estimated at 106 mm. Four rectangular windows were installed (35 x 67 mm), which were located in the lower corners. The size structure captured showed differences (P<0.05) showing a reduction in the capture of immature individuals. However, in terms of capture efficiency there were no differences between the evaluated CPUE. Conclusion. The incorporation of escape windows in the fishing of crabs could favor the reduction of the catch rates of immature individuals and consequently contribute to the sustainability of this fishery
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    Selectividad de red de encierro para Lisa (Mugil Incilis), Ciénaga Grande de Santa Marta
    (Corporación Universitaria Lasallista, Editorial Lasallista., 2020) Posada, Moisés; Noriega, Laura; Altamar, Jairo
    The Ciénaga Grande of Santa Marta is one of the estuarine ecosystems of greatest environmental, social and economic importance in the Colombian Caribbean. However, its fisheries have a strong impact on the fish populations that live there. Objective. An experimental sampling of the catches of lisa (Mugil incilis) with a “boliche” encircling gillnet was carried out to estimate the selection parameters. Materials and methods. Catches carry out with mesh size of 2, 2½ and 3-inch were compared and evaluated. The selectivity parameters were estimated from the SELECT method. The selectivity curves were adjusted using the R statistical software; while the comparative analyzes of the catch per unit effort were carried out encierro de 2 pulgadas o inferiores deben ser revisadas y su uso consensuado con los pescadores de la región.Palabras clave: pesca artesanal, selectividad, red de encierro, Mugil incilis, Ciénaga Grande de Santa Marta.using the Kruskal Wallis test. Results. Encircling gillnet smaller than 2½ inches have a direct effect on the smooth size structure and consequently on the sustainability of this fishery. Encircling gillnet should consider applyingmanagement measures that prohibit the use of nets with mesh sizes less than 2½ inches. In terms of catch there is no difference (P>0.05) between 2 and 2½ inches, which does not generate economic damage for the fisherman.Conclusion. The use of encircling gillnets with mesh size of 2-inch or smaller should be reviewed and agreed upon with the fishermen of the region.