Evaluación del crecimiento de la ostra del Pacífico. Magallana gigas (Thunberg, 1793), cultivada a diferentes densidades en un sistema de palangre en la costa central de Ecuador.: Evaluation of the growth of the Pacific oyster, Magallana gigas (Thunberg, 1793), cultured at different densities in a long-line system in the central coast of Ecuador.

Carlos Suarez Morrillo; Gavrik Larrea Ycaza; Jose Javier Alio MIngo

Authors

Carlos Suarez Morrillo Carrera de Biología, Facultad de Ciencias de la Vida y Tecnologías, Universidad Laica Eloy Alfaro de Manabí, Manta, Ecuador
Gavrik Larrea Ycaza Consultor independiente. Ciudadela Universitaria, Calle U6 y Av. Universidad 4, No. 04, Manta, Manabí, Ecuador
Jose Javier Alio MIngo 3Grupo de Investigación en Pesca y Acuicultura, Programa de Maestría en Recursos Acuáticos, Facultad de Ciencias de la Vida y Tecnologías, Universidad Laica Eloy Alfaro de Manabí, Manta, Ecuador 4Departamento de Procesos Químicos, Alimentos y Biotecnología, Facultad de Ingeniería y Ciencias Aplicadas, Universidad Técnica de Manabí, Portoviejo, Ecuador

Keywords:

Growth , survival , long-line culture , system dorso-ventral length , encrusting communities

Abstract

The Pacific oyster, Magallana gigas, has been commercially cultivated on the Ecuadorian coast since 2014, but little is known about its cultivation in the various suitable environments in the province of Manabí. This study evaluates the growth and survival of the species at different stocking densities during the early stages of cultivation, using a suspended longline system. The study was conducted at the San Mateo fishing pier, Manta Municipality, Ecuador, between September and December 2023. Oysters were stocked at three densities: 100 (DOMIN), 200 (DOMED), and 300 (DOMAX), with three replicates. They were placed in PE containers with a diameter of 26 cm and a height of 9 cm, with 2 mm² pores, randomly arranged in three-tier Chinese lanterns, 40 cm in diameter. The temperature, salinity, pH, and turbidity (Secchi) of the water in the cultivation area were recorded weekly. The initial dorso-ventral length (DVL) was 0.86±0.24 cm and the weight 0.23±0.22 g. The temperature ranged from 28.9°C to 27.3°C; the salinity from 34 to 35 ppm; the pH from 7.6 to 7.83; and the Secchi depth from 1.7 to 2.1 m. After 63 days of culture, the average DVL and total weights were 2.13±0.89 cm and 1.33±1.29 g (DOMIN), 1.81±0.79 cm and 0.95±0.94 g (DOMED), and 1.73±0.73 cm and 0.82±0.83 g (DOMAX), with only the DOMIN values differing from the other two densities. The observed survival rates were 75% (DOMIN), 69% (DOMED), and 65% (DOMAX), with no significant difference among densities. The rigid trays were externally colonized by encrusting communities, but the oysters inside remained clean. It is recommended that M. gigas be cultured at a density of 100 oysters per 26 cm diameter container to obtain the highest growth rate.

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Evaluation of the growth of the Pacific oyster, Magallana gigas (Thunberg, 1793), cultured at different densities in a long-line system in the central coast of Ecuador.