Data/hora: 20/05/2024 15:29:05

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Resumo em Anais de Congresso
Circulação/Nível: | -- - --
Data corrente: | 04/08/2011
Data da última atualização: | 04/08/2011
Autoria: | SILVA, F. C.; CANOZZI, M. B.; PEREIRA, A.; STEIN, L. C.
Afiliação: | Epagri
Título: | Hatchery broodstock conditioning of the oyster Crassostrea gigas (Thumberg, 1793) in South of Brasil.
Ano de publicação: | 2003
Fonte/Imprenta: | In: WORLD AQUACULTURE, ., 2003, Salvador, BA. Realizing the potential: responsible Aquaculture for a Secure Future. Baton Rouge, LA, USA: Worls Aquaculture Society, 2003.
Idioma: | Inglês

Conteúdo:

The development of oyster culture in Santa Catarina State and the consequent increase of seeds demand, had been the major challenge for LCMM in recent years. To increase and develop the production of Pacific Oyster seeds the laboratory needs to solve
problems related to adequate production of seeds within the period of major demand by the oyster producers. To supply this
market with oyster seeds, mature broodstock is needed in the winter and in the summer. In the south of Brazil the natural maturation
of the Broodstock occur during late spring; therefore techniques of artificial maturation must be refined. The principal goal of this
project is to reduce the period of conditioning (gametogenesis) in the laboratory. The Crassostrea gigas broodstock were cultured at the LCMM culture area in Sambaqui beach and brought to the lab with glycogen reserve. They were submited to two treatments in relation to temperature. In the ?fast? treatment the temperature was increased by one degree centigrade every three days and in the ?slow? treatment it was increased one degree centigrade every seven days. The temperatures were elevated from 18 0C to 23 0C in both cases. The daily feeding in the laboratory tanks consisted of a mixed diet of microalgae with a concentration of 10 to 20 x 109 cells per oyster. A control group was maintained at Sambaqui Marine Farm until each spawning time. The broodstock in the laboratory and field control group were submited to three spawning times; at the end of 36 (spawn 1), 50 (spawn 2) and 62 (spawn 3) days of conditioning at the different treatments. The number of total oocytes obtained in each spawning in the different treatments are presented in the picture. When estimating each spawn separately, in spawning 1, the number of oocytes obtained in the ?fast? was greater than in the ?slow? and the control with 152, 39 and 25 millions of oocytes respectively. In spawning 2, the number of oocytes was greater in the ?fast? treatment. In spawning 3 the broodstock under the ?slow? treatment and the control displayed a larger number of oocytes . The numbers indicate that the fast treatment presents better results in a shorter period. This reduces time of maturation which also reduces production costs; therefore allowing laboratories to manage sufficient production of seed during the time periods required by the market.

Palavras-Chave: | Broodstock; Maturation; Oyster.
Categoria do assunto: | --
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_5886.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (81913-1) - UPC - PL - -- -  -  -  - DIS