Estimación del crecimiento de la concha prieta Anadara tuberculosa (Mollusca: Bivalvia) en Puerto Bolivar, Ecuador: Un análisis del período 2008-2011
Fecha
2013
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
El crecimiento de la concha prieta (Anadara tuberculosa) fue estimado a partir de datos mensuales de tallas colectados en Puerto Bolívar - Provincia del Oro. La información correspondió al periodo 2008 – 2011 y fue utilizada para la elaboración de distribuciones de frecuencias mensuales con dos intervalos de clases de talla (ICT) y posterior a esto estimar los parámetros de crecimiento del modelo de Von Bertalanffy
(MVB), empleando las rutinas ELEFANI(ElectronicLengthFrequencyAnalysis)y NSLCA(New Shepherd´sLengthCompositionAnalysis), del programa FISAT II (FAO ICLARM STOCK ASSESMENT TOOLS). El efecto de cada muestra fue cuantificado por medio de la técnica de jacknife. Un total de 22.055 individuos fueron muestreados de la captura comercial cuyo rango de tallas oscilo entre 20.82 y 89.36 mm. Las
estimaciones del parámetro L(longitud asíntota)fueron similares para ambas rutinas, fluctuando entre 76.96 y 87.95 mm con un ICT de 1.5 mm, mientras que de 77.11 a 87.34 mm con un ICT de 2.0 mm. Por otro ladolas estimaciones del parámetro k“parámetro de curvatura”, fueron de 0.23 a 0.77 año-1 con un ICT de 1.5mm y 0.27 a 0.76 año-1 con un ICT de 2.0 mm. El análisis comparativo indico que las estimaciones de ELEFAN I y NSLCA son diferentemente significativas. La edad relativa estimada, reflejó que el mayor porcentaje de individuos de la captura comercial en este periodo,
estuvieron entre 2 y 3 años de edad.
The growth of brown shell (tuberculousAnadara) was estimated from monthly length data collected in Puerto Bolivar - Provincia del Oro information corresponded to the period from 2008 to 2011 and was used to make distributions monthly frequencies with two intervals class size (ICT) and after this estimate growth parameters of Von Bertalanffy model (MVB) using the ELEFAN I (Electronic Length Frequency Analysis)and NSLCA (New Shepherd´s Length Composition Analysis), the program routinesFISATII(FAO ICLARM STOCK ASSESMENT TOOLS). The effect of each sample was quantified by the jackknife technique. A total of 22,055 individuals were sampled from the commercial catch tilt ranging in size between 20.82 and 89.36 mm. Estimates L parameter were similar for both routines, ranging between 76.96 and 87.95 mm with a 1.5 mm ICT, while from 77.11 to 87.34 mm with a 2.0 mm ICT. Conversely k parameter estimates varied for both methods and ICT. These were from 0.23 to 0.77 years ICT-1 with a 1.5 mm and 0.27 to 0.76 yr-1 with a 2.0 mm ICT. Comparative analysis indicated that the estimates of the methods are significant differently. The estimated relative age, reflecting the higher percentage of individuals in the commercial catch in this period, were between 2 and 3 years old.
The growth of brown shell (tuberculousAnadara) was estimated from monthly length data collected in Puerto Bolivar - Provincia del Oro information corresponded to the period from 2008 to 2011 and was used to make distributions monthly frequencies with two intervals class size (ICT) and after this estimate growth parameters of Von Bertalanffy model (MVB) using the ELEFAN I (Electronic Length Frequency Analysis)and NSLCA (New Shepherd´s Length Composition Analysis), the program routinesFISATII(FAO ICLARM STOCK ASSESMENT TOOLS). The effect of each sample was quantified by the jackknife technique. A total of 22,055 individuals were sampled from the commercial catch tilt ranging in size between 20.82 and 89.36 mm. Estimates L parameter were similar for both routines, ranging between 76.96 and 87.95 mm with a 1.5 mm ICT, while from 77.11 to 87.34 mm with a 2.0 mm ICT. Conversely k parameter estimates varied for both methods and ICT. These were from 0.23 to 0.77 years ICT-1 with a 1.5 mm and 0.27 to 0.76 yr-1 with a 2.0 mm ICT. Comparative analysis indicated that the estimates of the methods are significant differently. The estimated relative age, reflecting the higher percentage of individuals in the commercial catch in this period, were between 2 and 3 years old.
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Palabras clave
ANADARA TUBERCULOSA, CRECIMIENTO, INTERVALO DE CLASE DE TALLAS