Salinity does not alter the effectiveness of menthol as an anesthetic and sedative during the handling and transport of juvenile fat snook (Centropomus parallelus).
The effectiveness of menthol as anesthetic and sedative for fat snook (Centropomus parallelus) was tested at different salinities. In the first experiment, the fish were exposed to different concentrations of menthol (25, 37 and 50 mg L-1) in water at different salinities (0, 17 and 36 ppt). In the second experiment, the fish were transported for 10 hours in water with menthol at concentrations of 0, 3.7 and 7.4 mg L-1 under different salinities. Na+ and K+ ions from fish body and water were analyzed after transport. The optimal concentrations of menthol for a short handling period and surgical induction was 37 and 50 mg L-1, respectively, and these values were independent of salinity. After transport, neither mortality nor significant changes in ammonia or dissolved oxygen were observed between treatments at the different salinities. The nitrite levels were lower in freshwater than in brackish and saltwater, but did not change with mentol. The total body levels of Na+ increased with the salinity increase. Menthol is an effective anesthetic for handling of juvenile fat snook at different salinities. Menthol did not influence the measured water parameters and body ions, and it is not necessary for the transport of fat snook.
Laboratório de Ictiologia Aplicada, Universidade Vila Velha, Universidade de Vila Velha, Vila Velha ES , Brazil, Laboratório de Ictiologia Aplicada, Universidade Vila Velha - UVV, Rua Comissário José Dantas de Melo, 21, Boa Vista, CEP 29101-770, Vila Velha, ES, Brazil.
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Sepulchro
Laboratório de Ictiologia Aplicada, Universidade Vila Velha, Universidade de Vila Velha, Vila Velha ES , Brazil, Laboratório de Ictiologia Aplicada, Universidade Vila Velha - UVV, Rua Comissário José Dantas de Melo, 21, Boa Vista, CEP 29101-770, Vila Velha, ES, Brazil.
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Carvalho
Laboratório de Ictiologia Aplicada, Universidade Vila Velha, Universidade de Vila Velha, Vila Velha ES , Brazil, Laboratório de Ictiologia Aplicada, Universidade Vila Velha - UVV, Rua Comissário José Dantas de Melo, 21, Boa Vista, CEP 29101-770, Vila Velha, ES, Brazil.
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Gomes
D000777:Anesthetics / Q000494:pharmacology; D000818:Animals; D001938:Brazil; D004305:Dose-Response Relationship, Drug; D006993:Hypnotics and Sedatives / Q000494:pharmacology; D008610:Menthol / Q000494:pharmacology*; D010473:Perciformes / Q000378:metabolism* / Q000601:surgery*; D054712:Salinity; D014186:Transportation / Q000379:methods*
D000777:Anesthetics; D006993:Hypnotics and Sedatives; D008610:Menthol