The present study evaluated different concentrations of clove oil for anesthesia of guppy (Poecilia reticulata). Adult female, male and juveniles fish were used to assess the influence of the anesthesia. The animals were individually submitted to the following clove oil concentrations: 50, 75, 100, 125 and 150 mg L-1. The induction, recovery stages and mortality 96 hours after the experiment were evaluated. All fish exposed to experimental concentrations reached the final stage of anesthesia. Adult female and male and juveniles guppies respond differently to anesthesia induction by clove oil. Thus, it is recommended the use of clove oil on concentrations of 125 mg L-1 for adult males and from 75 mg L-1 to 150 mg L-1 for adult females and juveniles animals.

Piava (Leporinus obtusidens) is one of the main cultivated native fish and one of the most caught in Rio Grande do Sul, South Brazil. The objective of this work was to compare the carcass and fillet yields of piava, females and males, collected from the wild (Treatment 1 -T1) and from fish culture (Treatment 2 -T2) and to analyze the chemical composition of fillets. For this purpose, four females and four males of each treatment were used. T1 females had significant higher values (P<0.05) in the carcass yield. Chemical analyses of the fillet indicated that fish originating from fish farming, independent of sex, showed higher values (P<0.05) for protein and ash contents. Thus, the management and the suitable food in fish farming could contribute to the production of a better quality fish. O manejo e a alimentação adequados na piscicultura podem contribuir com a produção de um peixe de melhor qualidade. Keywords

O objetivo deste estudo foi avaliar diferentes concentrações de mentol para anestesia de fêmeas adultas, machos adultos e juvenis de guppy (Poecilia reticulata). Para isto, foram utilizadas 30 fêmeas adultas (0,379 ± 0,108 g), 30 machos adultos (0,220 ± 0,049 g) e 30 juvenis (0,033 ± 0,016 g). Os animais foram expostos, individualmente, a cinco concentrações de mentol (50, 100, 150, 200 e 250 mg L-1), seis peixes por concentração, sendo avaliados os tempos de indução e recuperação anestésica e a mortalidade até 96 h após a realização do experimento. A concentração de 50 mg L-1 não induziu a anestesia em nenhum dos grupos avaliados. As concentrações de 100 e 250 mg L-1 ocasionaram a mortalidade de 100% dos adultos (machos e fêmeas) e juvenis, respectivamente. As concentrações de 150 a 250 mg L-1 e 150 a 200 mg L-1 de mentol demonstram eficácia e segurança para anestesia de adultos (machos e fêmeas) e juvenis de guppy, respectivamente.

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