Mesh sizes and types and stocking density on the growth of the oyster Magallana gigas

• Autores: Valverde Moya, José Antonio, Arce Núñez, Fabiola, Varela Mejías, Alexander
• Formato: artículo
• Fecha de Publicación: 2025
• Institución: Universidad Nacional Mayor de San Marcos
• Repositorio: Revistas - Universidad Nacional Mayor de San Marcos
• Lenguaje: español
• OAI Identifier: oai:revistasinvestigacion.unmsm.edu.pe:article/26278
• Enlace del recurso: https://revistasinvestigacion.unmsm.edu.pe/index.php/veterinaria/article/view/26278
• Nivel de acceso: acceso abierto
• Materia: oysters; growth; mesh; culture density; ostras; crecimiento; malla; densidad de cultivo

The purpose of this study was to investigate the effect of tray type (plastic and saran) on biometric parameters and oyster growth using four mesh sizes with oysters of different sizes. A total of 5600 juvenile oysters from a pre-growing phase at the same production site were classified into four size groups: smallest, small, medium, and large, based on shell length and body mass measurements. Oysters were placed in plastic mesh bags with thicknesses appropriate for the treatments (3 mm for the smallest and smallest, 6 mm for medium, and 20 mm for large). Saran bags, traditionally used by oyster farmers in Costa Rica, were used as controls. Four replicates were used per treatment and control. The number of oysters per plastic mesh bag and saran bag was 600, 500, 200, and 100 for the smallest, small, medium, and large oysters, respectively. The study lasted 103 days. The lowest survival rate was recorded in the smallest oysters (25–30%), while the other sizes ranged between 40 and 50%. The increase in shell length was significantly greater (p<0.05) in all oysters in plastic mesh compared to saran bags. The smallest oysters grew faster in each type of material (p<0.05). Oysters had a greater increase in body mass in plastic mesh bags compared to saran bags; especially in large oysters (34.66 ± 4.53 g) and medium oysters (30.98 ± 6.23 g) in the plastic mesh (p<0.05) compared to the other oysters. Large oysters were obtained in both types of containers and medium oysters in the plastic mesh suitable for marketing.