Citation
Ng K. Y., . and Ong B. L., . A case of Gill copepod (Lernanthropus latis) infestation in an Asian seabass (Lates calcarifer) net-caged culture in Kelantan. pp. 23-26.
Abstract
Lernanthropus latis (L. latis) is a parasitic copepod that attaches to gill filaments of fish. The parasitic copepods feed on blood mucus and skin of the host causing mechanical injuries which may serve as a vector for primary viral and bacterial infections resulting in fish mortality. In this report L. latis infestation was found in an Asian seabass netcaged culture site in Kelantan since early September 2017. The main complaint of farmer was that numerous elongated reddish parasitic organisms were seen attaching onto the gills filaments. A series of diagnostic workups were performed to identify the parasite and other disease conditions that may affect the fish due to the parasitic infestation. Gills kidney liver and spleen were taken for histopathology bacteriology and parasitology examinations. Morphological examination of the parasites revealed the presence of L. latis. Cultures of kidney liver and spleen on thiosulfate-citratebile-sucrose agar yielded pure growth of Vibrio species but there were no clinical signs and histopathological lesions which were indicative of vibriosis. Water quality test indicated low dissolved oxygen of 2 ppm. The case was confirmed to be L. latis infestation. Treatment options were discussed with the farmer but logistically it is difficult to implement. The underlying problem was identified to be organic matter sedimentation and overload in the lagoon bottom due to unsustainable aquaculture practices since the operation of this culture site in 2003. Thus good aquaculture practices were recommended as a long term strategy to overcome the parasitic copepod infestation in this culture site.
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Abstract
Lernanthropus latis (L. latis) is a parasitic copepod that attaches to gill filaments of fish. The parasitic copepods feed on blood mucus and skin of the host causing mechanical injuries which may serve as a vector for primary viral and bacterial infections resulting in fish mortality. In this report L. latis infestation was found in an Asian seabass netcaged culture site in Kelantan since early September 2017. The main complaint of farmer was that numerous elongated reddish parasitic organisms were seen attaching onto the gills filaments. A series of diagnostic workups were performed to identify the parasite and other disease conditions that may affect the fish due to the parasitic infestation. Gills kidney liver and spleen were taken for histopathology bacteriology and parasitology examinations. Morphological examination of the parasites revealed the presence of L. latis. Cultures of kidney liver and spleen on thiosulfate-citratebile-sucrose agar yielded pure growth of Vibrio species but there were no clinical signs and histopathological lesions which were indicative of vibriosis. Water quality test indicated low dissolved oxygen of 2 ppm. The case was confirmed to be L. latis infestation. Treatment options were discussed with the farmer but logistically it is difficult to implement. The underlying problem was identified to be organic matter sedimentation and overload in the lagoon bottom due to unsustainable aquaculture practices since the operation of this culture site in 2003. Thus good aquaculture practices were recommended as a long term strategy to overcome the parasitic copepod infestation in this culture site.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Parasites |
| AGROVOC Term: | Parasitic diseases |
| AGROVOC Term: | Lates calcarifer |
| AGROVOC Term: | Gills |
| AGROVOC Term: | Fish |
| AGROVOC Term: | Infestation |
| AGROVOC Term: | Mortality |
| AGROVOC Term: | Cage culture |
| AGROVOC Term: | Postmortem diagnosis |
| AGROVOC Term: | Disease prevention |
| Depositing User: | Mr. AFANDI ABDUL MALEK |
| Last Modified: | 24 Apr 2025 00:54 |
| URI: | http://webagris.upm.edu.my/id/eprint/8334 |
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