Histopathological and behaviour effects of formaldehyde treatment in juvenile mullet,Mugil liza (Valenciennes) |
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Authors: | Eduardo Pahor‐Filho Kleber Campos Miranda Filho Marta Klosterhoff Luis Alberto Romano Joaber Pereira Júnior |
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Institution: | 1. Aquaculture Center of the Universidade Estadual Paulista UNESP (CAUNESP), Jaboticabal, SP, Brazil;2. Aquaculture Laboratory, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil;3. Immunology and Pathology of Aquatic Organisms Laboratory, Federal University of Rio Grande, Rio Grande, RS, Brazil;4. Parasitology of Aquatic Organisms Laboratory, Federal University of Rio Grande – FURG, Rio Grande, RS, Brazil |
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Abstract: | Considerable losses may be related to diseases caused by parasites in aquaculture. Formaldehyde (37% gas dissolved in water) is an effective chemotherapeutic, widely used to control ectoparasites in fish. However, for many species of fish used in aquaculture, the control of external parasites and the deleterious effects of formaldehyde in short‐term baths are still uncertain. In order to clarify some gaps, 1 h‐prophylactic baths (67.5, 135, 270, 405 and 540 mg L?1 formaldehyde in triplicate) were performed in juvenile mullet, Mugil liza (Valenciennes). Results showed that prophylactic baths of 135 mg L?1 formaldehyde by 1 h did not cause death in tested mullets. At this concentration, histopathologies were mild and fish survival was high. However, fish exposed to increasing concentrations of formaldehyde presented severe histopathologies in the gills besides behavioural and morphological alterations. The histopathological and behavioural implications of formaldehyde use in aquaculture are discussed. |
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Keywords: | chronic toxicity gill histopathology ectoparasites treatment |
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