Incidencia de la Pesca Artesanal en las poblaciones de la Ostra Nativa (Crassostrea iridescens) en los arrecifes rocosos de Ayangue, Provincia de Santa Elena
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2014
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La extracción incontrolada de la ostra Crassostrea iridescens en los arrecifes rocosos de Ayangue causada por la pesca artesanal, ha conducido al agotamiento de este importante recurso. Desde agosto de 2012 a Febrero de 2013 se realizaron monitoreos in situ mediante la técnica de transecto de barrido circular encontrándose un total 350 ostras en los sitios de captura: Angahuel, La Leona, Cabuya y La Loca, en un área de cobertura de 400 m², con profundidades que osciló entre 3 a 6 metros. Se determinó la densidad poblacional en cada sitio de estudio: En Angahuel con 0,2 ostras/m². En La Leona con 1,5 ostras/m². En la Cabuya con 0,6 ostras/m². En La Loca con 0,4 ostras/m². La distribución de talla de las ostras fluctuó de 8 – 12 cm con un total de 270 individuos y la talla de 12 – 16 cm con 29 ostras. En la temporada seca se registraron mayormente ostras de talla pequeñas, en la temporada de transición tallas pequeñas y mediana, y en la temporada lluviosa ostras de talla pequeñas, medianas y grandes. En los desembarques en la playa se registraron 915 ostras de varias tallas, cuyos sitios de captura fueron: La Leona, Cabuya, La Loca y otros sitios no reconocidos, las ostras de mayor abundancia fueron de la talla de 8-12 cm sobrepasando los 600 individuos y la de menor frecuencia de talla fue de 16-20 cm con solo 4 individuos. La temperatura mínima fue de 23 °C y la temperatura máxima de 27.8 °C. En el análisis con histogramas y anova de un solo factor con un nivel de significancia (α) = 0.05, no encontró una distribución normal de tallas en los sitios de monitoreo y en la densidad poblacional no se evidenció la presencia de nuevas cohortes.
The uncontrolled extraction of the oyster Crassostrea iridescens in rocky reefs Ayangue caused by artisanal fisheries, has led to the depletion of this important resource. From August 2012 to February 2013 were performed monitoring in situ were done using circular scanning transect technique finding a total 350 oysters were found in the capture sites: Angahuel, La Leona, and La Loca Cabuya in a coverage area of 400 m², with depths ranged from 3-6 meters. Population density was determined in each study site: In Angahuel with 0.2 oysters/m². In La Leona oysters with 1.5/m². In Cabuya 0.6 oysters/m². In La Loca with 0.4 oysters/m². The size distribution of the oysters ranged from 8-12 cm with a total of 270 individuals and the size of 12 to 16 cm with 29 oysters. During the dry season of small size oysters were mostly registered in the transitional season small and medium sizes, and in the rainy season oysters from small, medium and large size. On landing on the beach 915 oysters of various sizes were recorded, whose capture sites were: Leona, Cabuya, La Loca and other unrecognized sites, oysters were most abundant in the 8-12 cm size exceeding 600 individuals and less frequently height was 16-20 cm with only 4 individuals. The minimum temperature was 23 ° C and the maximum temperature of 27.8 ° C. In the analysis with histograms and single-factor ANOVA with a significance level (α) = 0.05, it was found a normal distribution of sizes in the monitoring sites in the population density and the presence of new cohorts was not evidenced.
The uncontrolled extraction of the oyster Crassostrea iridescens in rocky reefs Ayangue caused by artisanal fisheries, has led to the depletion of this important resource. From August 2012 to February 2013 were performed monitoring in situ were done using circular scanning transect technique finding a total 350 oysters were found in the capture sites: Angahuel, La Leona, and La Loca Cabuya in a coverage area of 400 m², with depths ranged from 3-6 meters. Population density was determined in each study site: In Angahuel with 0.2 oysters/m². In La Leona oysters with 1.5/m². In Cabuya 0.6 oysters/m². In La Loca with 0.4 oysters/m². The size distribution of the oysters ranged from 8-12 cm with a total of 270 individuals and the size of 12 to 16 cm with 29 oysters. During the dry season of small size oysters were mostly registered in the transitional season small and medium sizes, and in the rainy season oysters from small, medium and large size. On landing on the beach 915 oysters of various sizes were recorded, whose capture sites were: Leona, Cabuya, La Loca and other unrecognized sites, oysters were most abundant in the 8-12 cm size exceeding 600 individuals and less frequently height was 16-20 cm with only 4 individuals. The minimum temperature was 23 ° C and the maximum temperature of 27.8 ° C. In the analysis with histograms and single-factor ANOVA with a significance level (α) = 0.05, it was found a normal distribution of sizes in the monitoring sites in the population density and the presence of new cohorts was not evidenced.
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CRASSOSTREA IRIDESCENS, ARRECIFES ROCOSOS, BARRIDO CIRCULAR