Hanging culture of juveniles of the winged oyster Pteria sterna in two baskets of different design

Cultivo suspendido de juveniles de la ostra alada Pteria sterna en dos cestas de diferente diseño

  • Luis Freites Universidad Estatal de la Península de Santa Elena - Ecuador
  • Franklin Jara Universidad Estatal de la Península de Santa Elena - Ecuador
  • María Gregori Universidad Estatal de la Península de Santa Elena - Ecuador
  • Jimmy Villón Universidad Estatal de la Península de Santa Elena - Ecuador
  • Adrián Márquez Escuela Superior Politécnica del Litoral (ESPOL) - Ecuador
  • Daniel Rodríguez Pesantes Escuela Superior Politécnica del Litoral (ESPOL) - Ecuador
  • César Lodeiros Universidad Técnica de Manabí - Ecuador

Resumen

 
The aim of this study was to determine the growth and survival of juveniles of the winged oyster Pteria sterna, culture in two types of baskets manufactured with local materials. These were ‘one floor baskets’ (OFB) and ‘three floor baskets’ (TFB), hung from two ‘long lines’ in two study sites, Ayangue and Palmar, Province of Santa Elena, Ecuador, over a five months experimental culture period. Environmental variables monitored included total particulate matter and its organic and phytoplanktonic fraction (chlorophyll a), temperature, and dissolved oxygen. Individuals showed an initial length, height (dorso-ventral) and thickness (inter-valvar) shell axis of 18.7 ± 0.32; 18.2 ± 0.29 and 7.4 ± 0.18 mm, respectively; and the soft tissue mass, shell mass and total mass were: 1.03 ± 0.04; 0.11 ± 0.005; 1.14 ± 0.04 g, respectively. At the end of the period, biometric and survival parameters were recorded. The individuals cultured in Ayangue using TFB showed increments in shell, soft tissues and total mass that were significantly higher than those from the OFB. Similar results, but with lower increments, were obtained by the individuals cultivated at Palmar site. The ANOVA II showed that the site, type of basket and the interaction between the two had a significant effect on the growth of the oysters. Survival exceeded 80% at both sites and for both basket types, but no significant differences were observed between site and basket type. Considering the growth and survival obtained for both types of baskets, we recommend the TFB baskets for winged oyster cultivation in these regions.
 
Keywords: growth, suspended culture, pearl oyster, predation, Eastern Tropical Pacific. 
 
Abstract
 
El objetivo de este estudio fue determinar el crecimiento y la sobrevivencia de juveniles de la ostra alada Pteria sterna, cultivadas en dos tipos de cestas manufacturadas con materiales locales. Estas fueron ‘cestas de un piso’ (OFB, en sus siglas en inglés) y ‘cestas de tres pisos’ (TFB, en sus siglas en inglés), suspendidas en dos líneas largas o ‘long lines’ ubicados en dos sitios de estudio, Ayangue y Palmar, Provincia de Santa Elena, Ecuador, por un periodo experimental de cinco meses de cultivo. Las variables ambientales monitoreadas incluyeron la materia total particulada y su fracción orgánica, Clorofila a, temperatura y oxígeno disuelto. Los individuos mostraron tallas iniciales de los axis de la concha: largo, alto (dorso-ventral) e inter-valvar de 18.7 ± 0.32; 18.2 ± 0.29 and 7.4 ± 0.18 mm, respectivamente; y masa seca de los tejidos suaves, concha y total de 1.03 ± 0.04; 0.11 ± 0.005; 1.14 ± 0.04 g, respectivamente. Al finalizar el periodo de cultivo, los parámetros biométricos y la sobrevivencia fueron documentadas. Los individuos cultivados en Ayangue en las cestas TFB mostraron incrementos en masas de la concha, tejidos suaves y total significativamente más altos que la de los cultivados en las OFB. Resultados similares, pero con menores incrementos, fueron obtenidos por los individuos cultivados en Palmar. El ANOVA II mostró que el sitio, tipo de cesta y su interacción tuvieron un efecto significativo en el crecimiento de las ostras. La sobrevivencia fue mayor al 80% en ambos sitios de cultivo y tipos de cestas, aunque sin diferencias significativas. Considerando el crecimiento y la supervivencia obtenidas en ambos tipos de cestas, se recomienda el uso de las TFB tipo de cestas, para el cultivo de las ostras en esta región.
 
Palabras clave: crecimiento, cultivo suspendido, ostras perleras, depredación, Pacifico Tropical Oriental.

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Publicado
2019-12-31
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