Evaluación de la pesquería de palangre artesanal y su efecto en la raya látigo (Dasyatis guttata) en Isla Zapara, Golfo de Venezuela / Evaluation of the artisanal longline fishery and its effect on the longnose stingray (Dasyatis guttata) in Zapara Island, Gulf of Venezuela

Barrios Garrido, Héctor, Bolivar, Jossimar, Benavides, Leonardo, Viloria, Jessica, Dugarte, Fabby, and Wildermann, Natalie (2017) Evaluación de la pesquería de palangre artesanal y su efecto en la raya látigo (Dasyatis guttata) en Isla Zapara, Golfo de Venezuela / Evaluation of the artisanal longline fishery and its effect on the longnose stingray (Dasyatis guttata) in Zapara Island, Gulf of Venezuela. Latin American Journal Of Aquatic Research, 45 (2). pp. 302-310.

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Abstract

Abstract (Spanish): La raya látigo Dasyatis guttata es una especie objetivo en la pesca artesanal del sur del Golfo de Venezuela. A pesar de su importancia económica, actualmente pocas evaluaciones se han efectuado para conocer su estado. Con el seguimiento de las actividades pesqueras de la flota artesanal de Isla Zapara, se evaluaron las características morfométricas, composición de sexos, captura por unidad de esfuerzo (CPUE, ind/1000 anzuelos), de D. guttata, durante seis meses continuos de muestreo (18 días de pesca). Los muestreos biológicos mensuales incluyeron el ancho de disco (AD), peso total (PT), y sexo. Se evaluó a) la relación talla-peso para cada sexo, b) el factor de condición mediante el índice de Fulton (K) mensual, y c) la CPUE. Se consideraron 210 ejemplares de la especie. Se obtuvo un promedio de AD = 64,14 ± 13,18cm; (rango 32-95cm), y de PT = 8,36 ± 4,87kg (rango 0,80-24,50kg) y proporción sexual de (2,26 hembras: 1 macho) (chi-cuadrado = 31,71; P < 0,05), por lo que se presume una segregación espacial de hembras y machos en la zona. La relación talla-peso fue significativa (P < 0,0001), y diferentes para cada sexo - hembras: PT(kg) = [(0,00027)×(AD(cm) 2,46)]; machos: PT(kg) = [(0,00035)×(AD(cm) 2,34)]. El valor K mostró divergencia entre sexos en noviembre y diciembre. La CPUE se estimó en 4,88 ind/1000 anzuelos. Se compararon estos resultados con investigaciones previas en la región sur del Caribe y se recomiendan mayores estudios de la especie en esta zona.

Abstract (English): The longnose stingray (Dasyatis guttata) is a target species in the artisanal fisheries of the southern Gulf of Venezuela. Despite its economic importance, nowadays, studies about its status are lacking. During six continuous months (18 working days in total), we followed the artisanal fishery activities from Zapara Island, and evaluated morphometric characteristics, sex ratio, and the capture per unit effort (CPUE/ind/1000 hooks) of D. guttata. Biological sampling included: disc widths (AD), body mass total (PT), and sex. Using statistical analysis we assessed: a) the length-weight relationships by sex, b) monthly body condition, using the Fulton Index (K), and c) the CPUE. We evaluated 210 individuals of D. guttata. The mean values of our results were: AD = 64.14 ± 13.18cm (range 32-95 cm); PT = 8.36 ± 4.87 kg (range 0.80-24.50 kg). The sexual proportion was (2.26 females: 1 male) (chi-squared = 31.716, P < 0.05); hence we presume a spatial segregation occurred between females and males in the studied area. Length-weight relationship was statistically significant (P < 0.0001), and also varied according to the sex - females: PT(kg) = [(0.00027)×(AD(cm)2.46)]; males: PT(kg) = [(0.00035)×(AD(cm)2.34)]. The K value showed differences between sexes during November and December. We obtained a CPUE of 4.88 individuals/1000 hooks. We compared our findings with previous research carried out in the southern Caribbean. Further research about this species in the area is recommended.

Item ID: 52976
Item Type: Article (Research - C1)
ISSN: 0718-560X
Keywords: Dasyatis guttata, longnose stingray, artisanal fisheries, longline, Gulf of Venezuela
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Funders: James Cook University Graduate Research School (JCU GRS)
Projects and Grants: JCU GRS IPRS
Date Deposited: 03 Apr 2018 05:32
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300505 Fisheries management @ 40%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310307 Population ecology @ 30%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 30%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960802 Coastal and Estuarine Flora, Fauna and Biodiversity @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 50%
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