Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae): Implications for the conservation of this species

Autor(es)

Honji, Renato M. ^[1] ; Mello, Paulo H. ^[1] ; Araujo, Bruno C. ^[1] ; Rodrigues-Filho, Jandyr A. ^[1] ; Hilsdorf, Alexandre W. S. ^[2] ; Moreira, Renata G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, BR-05508900 Sao Paulo - Brazil

^[2] Univ Mogi das Cruzes, Nucleo Integrado Biotecnol, BR-08701970 Mogi Das Cruzes - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 9, n. 2, p. 363-370, APR-JUN 2011.
• Citações Web of Science: 12

Resumo

Artificial reproduction and gamete fertilization were evaluated in Salminus hilarii wild and domesticated broodstocks. Wild and domesticated broodstocks were artificially induced to reproduction using a carp pituitary treatment. Four groups were considered: Group 1 (G1), fish caught in the wild maintained for three years in the same conditions as the domesticated broodstocks and spawned naturally; Group 2 (G2), broodstock born and raised in captivity and spawned naturally; Group 3 (G3), wild broodstocks, which were manually stripped for gamete collection and dry fertilization; and Group 4 (G4), domesticated males and females, also manually stripped. Oocytes, eggs, and larvae were sampled at different time intervals throughout embryonic development. Yolk sac absorption occurred approximately 24-29 h after hatching. Twenty-six h after hatching, the larvae mouths opened. Cannibalism was identified just 28-30 h after hatching. There was no morphological difference in embryonic development among all groups. The number of released eggs per gram of female was: G1: 83.3 ± 24.5 and G2: 103.8 ± 37.4; however, the fertilization success was lower in G2 (42.0 ± 6.37 %) compared with G1 (54.7 ± 3.02%) (P = 0.011). Hand-stripping of oocytes was not successful and the fertilization rate was zero. The reproduction of this species in captivity is viable, but it is necessary to improve broodstock management to enhance fertilization rates and obtain better fingerling production for restocking programs. (AU)

• Processo FAPESP: 01/10483-1 - Caracterizacao histologica, metabolica e molecular de peixes com migracao reprodutiva bloqueada por barragens ou confinamento em viveiros de cultivo.
• Beneficiário: Renata Guimarães Moreira Whitton
• Modalidade de apoio: Auxílio à Pesquisa - Regular