Ovarian development and cycles in cultured Siberian sturgeon,Acipenser baeri |
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| Institution: | 1. Department of Molecular Biology, University of León, León, 24071, Spain;2. INDEGSAL, University of León, León, 24071, Spain;3. IEO, Spanish Institute of Oceanography, Planta de Cultivos el Bocal, Barrio Corbanera s/n Bocal, Monte, Santander 39012, Spain;1. INSERM U 1151, Institut Necker Enfants Malades, Université Paris Sorbonne, Paris, France;2. Unité de Biostatistiques, Hôpital Necker Enfants Malades, Assistance Publique Hôpitaux de Paris, Paris, France;1. Department of Biochemistry and Molecular Biomedicine and Institut de Biomedicina (IBUB), University of Barcelona, Barcelona, Catalonia, Spain;2. CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Spain;3. Institut de Recerca Pediàtrica Sant Joan de Déu, Barcelona, Catalonia, Spain;1. Universidade Federal do Pará, Campus de Bragança, Instituto de Estudos Costeiros, Laboratório de Conservação e Biologia Evolutiva, Alameda Leandro Ribeiro, s/n, Bragança, PA, CEP 68600-000, Brazil;2. Instituto Evandro Chagas, Seção de Meio Ambiente, Laboratório de Biologia Ambiental, Rodovia BR 316, Km 07, s/n, Levilândia, Ananindeua, PA, CEP 67030-070, Brazil;3. Universidade Federal do Pará, Campus de Bragança, Instituto de Estudos Costeiros, Laboratório de Moluscos, Alameda Leandro Ribeiro, s/n, Bragança, PA, CEP 68600-000, Brazil;4. Museu de Zoologia da Universidade de São Paulo, Caixa Postal 42494, São Paulo, SP, CEP 04299-970, Brazil;5. Instituto Federal de Ciência e Tecnologia do Pará, Campus de Abaetetuba, Rua Rio de Janeiro, 3322, Abaetetuba, PA, CEP 68440-000, Brazil |
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| Abstract: | Sturgeon lack external sexual dimorphism and have longer-than-annual ovarian cycles. Using gonadal biopsy of marked fish, we identified sex and monitored ovarian development in one cohort of cultured Siberian sturgeon over the age interval 8.5–12.5 year. Sex ratio in the population did not differ from 1:1 (268 females and 286 males). Each November, the females were separated into two groups: one with ovarian follicle diameter ≥ 2.8 mm (Group 2, spawnable) and another with smaller follicles in previtellogenic or vitellogenic growth (Group 1). During the 5 year period of observations, 11.2 % of the initial 268 females were lost. The oocytes of Group 2 exhibited migratory germinal vesicle but its position in animal hemisphere was not peripheral in November. The annual changes in proportions of Group 2 females, from 34.6 to 63.3 %, reflected ovarian cycles of different duration. Majority of 196 females, matured two or more times during a period of study, exhibited biennial ovarian cycle or recurring cycles of 1 and 2 years in the same individual. Annual and triennial cycles were also observed. Some abnormalities in oocyte pigmentation are described. |
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