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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

EFEITO DO EUGENOL NA SOBREVIDA DE LAMBARIS (ASTYANAX SP) EM DIFERENTES CONCENTRAÇÕES E TEMPERATURAS

Paula, Coraci de 30 September 2009 (has links)
Made available in DSpace on 2016-08-10T10:31:06Z (GMT). No. of bitstreams: 1 CORACI DE PAULA.pdf: 1061738 bytes, checksum: 7cb8fb72afb31a762050eb17ad1c9925 (MD5) Previous issue date: 2009-09-30 / The present study aimed to evaluate the effect of eugenol on the lambaris survival (Astyanax sp) at different concentration and temperatures, contributing to transportations technics. Six hundred and twenty five fish with 4,28±2,75 g 6,62±1,18 cm were used. Eugenol concentrations of 7,5; 9,5; 11,5; 13,5 and 15,5 mg/L were tested at 05 replications. Each concentration was submitted to temperatures of 20, 22, 24, 26 and 28°C, totalizing 125 experimental units. Each unit received 05 fishes, wich were kept of 01 liter volume until the beginning of mortality, when the analyses of pH, ammonia, and dissolved oxygen started. The results obtained showed that the beginning of mortality, pH and ammonia were significantly influenced by the temperature and eugenol concentrations. The dissolved oxygen was influenced only by the eugenol concentration. Considering the temperature, it was registred that temperatures between 20 and 28°C caused mortality earlier than temperatures around 24°C. It was concluded that eugenol concentrations between 7,5 and 15,5 mg/L are appropriated for this specie. Besides, it was observed temperature of 24°C and eugenol concentrations in the range of 7,5 and 9,5 mg/L indicated to use in the transportation of lambari. / O objetivo deste trabalho foi avaliar o efeito do eugenol na sobrevida de lambaris (Astyanax sp) em diferentes concentrações e temperaturas, visando aprimorar as técnicas de transporte. Foram utilizados 625 peixes com 4,28 ± 2,75 g 6,62 ± 1,18 cm, submetidos a concentrações de eugenol de 7,5; 9,5; 11,5; 13,5 e 15,5 mg/L sob diferentes temperaturas (20, 22, 24, 26 e 28°C), totalizando 25 tratamentos com 05 repetições cada. Assim foram utilizados 125 unidades experimentais de 1litro cada, onde os peixes permaneceram até se observar o início da mortalidade, momento em que encerrava o ensaio e procedia a análise do pH, oxigênio dissolvido, amônia da água e biometria dos peixes. Os resultados mostraram que a temperatura e o eugenol influenciaram no início da mortalidade, pH e amôna, no entando, o oxigênio dissolvido foi influenciado apenas pelas concentrações do eugenol. Temperaturas em torno de 20 e 28°C parecem acelerar a mortalidade dos peixes, comparando-se com temperaturas próximas a 24°C. Pode-se concluir que concentrações de eugenol de 7,5 a 15,5 mg/L são apropriadas para a espécie em questão. Paralelamente conclui-se que a temperatura de 24°C e concentração do eugenol na faixa de 7,5 a 9,5são as mais indicadas para o uso no transporte do lambari.

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