Crioconservação do sêmen da garoupa-verdadeira Epinephelus marginatus (Lowe, 1834) (Teleostei, Serranidae)

Autores

  • Eduardo Gomes SANCHES Núcleo de Pesquisa e Desenvolvimento do Litoral Norte, Instituto de Pesca/APTA/SAA
  • Idili da Rocha OLIVEIRA Núcleo de Pesquisa e Desenvolvimento do Litoral Sul, Instituto de Pesca/APTA/SAA -
  • Pedro Carlos da Silva SERRALHEIRO Núcleo de Pesquisa e Desenvolvimento do Litoral Sul, Instituto de Pesca/APTA/SAA

Palavras-chave:

diluidores, crioprotetor, Epinephelus marginatus, reprodução, maricultura

Resumo

Este trabalho foi realizado com a finalidade de desenvolver um protocolo de crioconservação do sêmen da garoupa-verdadeira, Epinephelus marginatus. Em um experimento fatorial foram analisados os efeitos de três diluentes (pH 6,1; 7,8 e 8,2), duas concentrações de dimetilsulfóxido (DMSO, 5 e 10%) e três velocidades de congelamento (110, 90 e 60°C x min-1) sobre a motilidade e tempo de motilidade espermáticas. Uma amostra de 16 exemplares com peso médio de 1.378 ± 358 g e comprimento total médio de 44,0 ± 4,0 cm, oriunda da natureza, foi mantida em tanques-rede e sexualmente invertida com metil-testosterona. O sêmen obtido foi congelado empregando-se palhetas criogênicas em vapor de nitrogênio e, posteriormente, transferido para nitrogênio lí­­quido. A combinação que propiciou maior taxa de motilidade e tempo de motilidade espermáticas (p< 0,05) foi proporcionada pelo emprego do diluente de pH 8,2 com DMSO (5%) e uma velocidade de congelamento de 60°C min-1 (p< 0,05). Estes resultados possibilitam a implantação um de banco de sêmen da garoupa-verdadeira no Brasil, reduzindo a necessidade da adoção da inversão sexual rotineira para a reprodução da espécie.

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2018-11-06

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