Catch per unit effort-environmental variables relations in the fishery of white shrimp (<i>Litopenaeus schmitti</i>) from the Gulf of Venezuela

• 作者: ángel Antonio Díaz Lugo Jesús Méndez Luis González Manuel C orona Orlando José Ferrer Monta?o Rodolfo álvarez
• 来源期刊: 农业科学(英文)
• 学科: 医学
• 关键词: Distribution CPUE LITOPENAEUS schmitti GULF of VENEZUELA
• 年，卷（期）: 2013,（6）
• 页码范围: 83-90
• 页数: 8页
• 分类号: R73

摘要

During 15 months the white shrimp (Litopenaeus schmitti) fishing zone was characterized ecologically through the obtaining, compilation and analysis of environmental and physicochemical variables, and modeled the distribution of the relative abundance (CPUE) obtained in 21 fishing sites according to the environmental structure defined by the studied variables. A two-way factorial ANOVA with interaction was used to examine the spatial (fishing sites) and temporal (months) dynamics of CPUE, and a principal component analysis (PCA) was used to discern the environmental structure of the study area. To determine if the environmental structure modeled the distribution of white shrimp, the CPUE values were superimposed on maps of the study area showing strata of the most important physicochemical variables identified by PCA. ANOVA confirmed that the CPUE differed significantly among months (F = 15.6;GL = 11;P P = 0.1979);the interaction term was also not significant (F = 0.52;GL = 10;P = 0.8561). The superimposing of the CPUE on temperature and depth strata confirmed that white shrimp showed greater preference for intermediate temperatures and depths. Petróleos de Venezuela, S.A (PDVSA) contemplates the construction of a multiuse pipeline traversing the study area, by which the current environmental structure of the study area is prone to disturbance. Given the precedent effects represented by an aqueduct construction, it seems PDVSA should anticipate measures to minimize its impact on the fisheries of the zone, particularly on the white shrimp fishery.