Effects of Clove Oil Anaesthesia on Rainbow Trout (Oncorhynchus mykiss)

By J. Velíšek, Z. Svobodová, V. Piačková. 2005

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Veli‰ek J., Z. Svobodova, V. Piaakova: Effects of Clove Oil Anaesthesia on Rainbow Trout (Oncorhynchus mykiss). Acta Vet. Brno 2005, 74: 139-146. The aim of the study was to investigate acute toxicity of clove oil for rainbow trout and, using values of haematological and biochemical profiles of blood and histological tissue examinations, to assess the effects of the fish exposure to that anaesthetic. Acute toxicity values of clove oil for rainbow trout found were 10 min LC50 81.1 mg·l -1 ; 10 min LC0.1 63.9 mg·l -1 ; 10 min LC99.9 100.1 mg·l-1; 96 h LC50 14.1 mg·l-1; 96 h LC0.1 12.5 mg·l-1, and 96 h LC99.9 16.2 mg·l-1. Clove oil anaesthesia had no effect on the heamatological profile of blood. A significant increase in the concentration of glucose (GLU) and ammonia (NH 3 ), and a significant decrease in the aspartate aminotransferase (AST) activity following a 10 min anaesthesia were found. A significantly decreased AST activity was also found 24 h after anaesthesia. Clove oil anaesthesia had no effect on other biochemical indices. Histological examination of the fish following anaesthesia revealed sporadic ectasia in gill lamellae 24 h after anaesthesia in 20% of fish. No histopathological changes were demonstrated in other tissues (liver, spleen, cranial and caudal kidneys). Results of the examinations suggest that the use of clove oil at a concentration of 30 mg·l -1 does

Subfields: Aquatic Science, Immunology, Physiology

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