Oocyte and embryo quality in Crassostrea gigas (Portuguese strain) during a spawning period in Algarve,South Portugal |
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| Institution: | 1. Unidade de Biotecnologia e Recursos Genéticos, INIAV-Santarém, Quinta da Fonte Boa, Vale de Santarém, Portugal;2. Escola de Ciências e Tecnologia, ICAAM—Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Universidade de Évora, Núcleo da Mitra, Évora, Portugal;3. CIISA, Faculdade de Medicina Veterinária, Universidade de Lisboa Avenida da Universidade Técnica, Lisboa, Portugal;4. Escola Universitária Vasco da Gama, Av. José R. Sousa Fernandes, Campus Universitário – Bloco B, Lordemão, Coimbra, Portugal;1. “Scienze del Farmaco e Prodotti per la Salute” Department, University of Messina, Viale Annunziata, 98168 Messina, Italy;2. Dipartimento di Scienze Biologiche e Ambientali (DiSBA), University of Messina, Viale Stagno d’Alcontres, 98166 Messina, Italy;3. University Campus Bio-Medico of Rome, Via Álvaro del Portillo 21, 00128 Rome, Italy;4. Chromaleont s.r.l., c/o “Scienze del Farmaco e Prodotti per la Salute” Department, University of Messina, Viale Annunziata, 98168 Messina, Italy;1. Animal Science Department of Federal University of Viçosa (UFV), Brazil;2. Veterinary Medicine Department of Federal University of Espírito Santo (UFES), Brazil;3. Veterinary Medicine Department of Federal University of Viçosa (UFV), Brazil;1. Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou 510301, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Sciences, Chulalongkorn University, Bangkok, 10330, Thailand;2. Faculty of Veterinary Science, Prince of Songkla University, Songkhla, 90110, Thailand;3. Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen, 40002, Thailand |
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| Abstract: | Egg quality is one of the most important factors determining larval viability. The study of oocytes released by `wild' broodstock will contribute to the definition of quality criteria applied to hatcheries as well as being an indicator of the oyster reproduction potential and aquaculture ongrowing systems. The aim of this study was to determine the relationship between condition of Crassostrea gigas spp. angulata (Portuguese strain) from `wild' broodstock (condition index, gonadal maturity and number of oocyte released), oocyte biochemistry and hatching rate of eggs during the spring/summer of 1995. Stages of gonadal maturity and condition index indicated that natural spawning of this species occurred between April and August with the highest spawning intensity occurring in June. Analyses demonstrated that C. gigas oocyte organic matter consist of 44–74 % proteins, 16–38 % lipids and 7–12 % carbohydrates. A significant relationship was observed between some biochemical parameters – organic matter and lipid content – and broodstock condition index and hatching rate. It seems that these two oocyte parameters (organic matter and total lipids) could be used to define quality of oocyte and thus larval viability. The oocyte protein content was also found to be associated with broodstock and larval quality. In summary, these data are a contribution to the knowledge of the reproductive cycle of oysters in Europe and may be useful in improving hatchery management of this species. |
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