Variation of infestation intensity with infective stages of the isopod Ceratothoa gaudichaudii in farmed salmon in the south of Chile
The study was carried out at a salmon farm located on Guar Island (42°, 41’S.; 73°, 01’E.), Xth Region, Chile. 500 salmon(Salmo salar)were sampled randomly from an isolated cage every three months. On each occasion the number and the size of the isopod parasiteCeratothoa gaudichaudiisettled in the o...
| Published in: | Archivos de medicina veterinaria |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | Spanish |
| Published: |
Archivos de Medicina Veterinaria
1997
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| Subjects: | |
| Online Access: | http://revistas.uach.cl/index.php/amv/article/view/4405 https://doi.org/10.4067/S0301-732X1997000100014 |
| Summary: | The study was carried out at a salmon farm located on Guar Island (42°, 41’S.; 73°, 01’E.), Xth Region, Chile. 500 salmon(Salmo salar)were sampled randomly from an isolated cage every three months. On each occasion the number and the size of the isopod parasiteCeratothoa gaudichaudiisettled in the oral cavity and gills were determined.Prevalence ranged from 33.4% to 98.8% in the 16 months of the assay. The highest number of infective stages (mancas) of the parasite were found in spring and during the summer; this produced the increment of small size parasites in autumn and winter. The number of medium and large size parasites increased during the summer months.The importance of wild fish, and specially ofTrachurus murphyi, as the normal host ofC. gaudichaudiiand its role as a main source of infestation for cultured salmon is discussed. El trabajo se realizó en un centro de cultivo de salmones de la isla Guar, X Región, Chile (50°, 44’S.; 74°, 30’O.). En una jaula aislada se mantuvieron salmones(Salmo salar)desde mayo de 1993 a agosto de 1994. Cada tres meses se muestrearon, al azar, 500 peces y se determinó el número y el tamaño de los parásitos de la especieCeratothoa gaudichaudiiubicados en la cavidad bucal y en las branquias. La prevalencia de la parasitosis aumentó de 33.4% a 98.8% en los 16 meses de observaciones. Las formas infestantes (mancas) del parásito se presentaron en mayor número a fines de primavera y durante el verano, lo que se tradujo en aumento de los ejemplares de tamaño pequeño en otoño e invierno. El número de parásitos medianos y grandes aumentó durante los meses del verano. Se discute la importancia de los jureles(Trachurus murphyi)como hospedador normal deC. gaudichaudiiy su rol como fuente de infección para los salmones cultivados. |
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