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Zootecnia Tropical
Instituto Nacional de Investigaciones Agrícolas Venezuela
ISSN: 0798-7269
Vol. 24, No. 2, 2006, pp. 177-192
Bioline Code: zt06015
Full paper language: English
Document type: Research Article
Document available free of charge

Zootecnia Tropical, Vol. 24, No. 2, 2006, pp. 177-192

 en Condition index of the mussels Perna perna check for this species in other resources and Perna viridis check for this species in other resources (Bivalvia:Mytilidae) under a suspended cultivation system in the Turpialito Bay, Cariaco Gulf, Venezuela
Vanessa Acosta, Antulio Prieto y Cesar Lodeiros

Abstract

With the purpose of knowing the minimum size of commercialization in fresh, it was compared the condition index of the mussels Perna perna check for this species in other resources and Perna viridis check for this species in other resources placed under a suspended cultivation system in Turpialito Bay, Gulf of Cariaco (July 2002 to 2003). Monthly, the dimension of the shell was determined as a function of the maximum ventral axis length, dry mass of the muscle, gonads, rest of soma, and the index of condition in both species. At the end of the study, P. perna presented the highest size growth (95.92 mm) compared to P. viridis (73.61 mm). The variation in weight of the dry mass was related to the condition index of both species. Perna perna showed the highest value (39.9%) in December, while P. viridis presented it in January (20.6%), coinciding in both species with an increment of the reproductive tissue and the increase of the chlorophyll a during the period of upwelling. However, the highest variability in the condition index was observed in P. viridis due to the higher intensity in the maturation processes and spawning, which was evidenced by the largest coefficient of variation (0.19). This indicates that the annual fluctuation in the reproductive process is more accentuated a typical behavior of tropical species, in spite of generating smaller reproductive tissues per unit of time than P. perna in the spawning periods.

Keywords
Condition index, Gulf of Cariaco, Perna perna, Perna viridis.

 
 es Índice de condiciín de los mejillones Perna perna check for this species in other resources y Perna viridis check for this species in other resources (Bivalvia:Mytilidae) bajo un sistema suspendido de cultivo en la Ensenada de Turpialito, Golfo de Cariaco, Venezuela
Vanessa Acosta, Antulio Prieto y Cesar Lodeiros

Resumen

Con la finalidad de conocer la talla mínima de comercializaciín en fresco, se comparí el índice de condiciín de los mejillones Perna perna check for this species in other resources y Perna viridis check for this species in other resources colocados bajo sistema de cultivo suspendido en la Ensenada de Turpialito, Golfo de Cariaco (Julio 2002 a 2003). Mensualmente, se determiní la dimensiín de la concha en funciín de la longitud máxima de su eje dorso-ventral, las masas secas del mösculo, gínadas y el índice de condiciín en ambas especies. Al final del estudio, Perna perna presentí el mayor promedio de talla (95,92 mm) con respecto a P. viridis (73,61 mm). La variaciín en peso de los diferentes tejidos secos se relacioní con el índice de condiciín de ambas especies. P perna alcanzí su más alto índice (39,89%) en diciembre, mientras que P. viridis lo presentí en enero (20,62%), coincidiendo en ambos con el incremento de los tejidos reproductivos y el aumento de la clorofila a durante el período de surgencia. Sin embargo, la mayor variaciín del índice de condiciín fue observada en P. viridis, debido posiblemente a una mayor intensidad de los procesos de maduraciín y desove, lo cual se evidencií con el mas alto coeficiente de variaciín (0,19), indicando que la fluctuaciín anual en el proceso reproductivo es más acentuado, comportamiento típico de las especies tropicales, a pesar de generar menor tejido reproductivo por unidad de tiempo que P. perna en los períodos de desove.

Palabras-clave
Índice de condiciín, Golfo de Cariaco, Perna perna, Perna viridis.

 
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Alternative site location: http://www.sian.inia.gob.ve/repositorio/revistas_ci/ZootecniaTropical/ztindice.htm

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