Artificial spawning in cultured sterlet sturgeon, Acipenser ruthenus L., with special emphasis on hermaphrodites
Autor: | Arne Ludwig, M. Pelard, T. Rouault, D. Mercier, R. Brun, Patrick Williot |
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Přispěvatelé: | Ecosystèmes estuariens et poissons migrateurs amphihalins (UR EPBX), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), INSTITUT OF FRESHWATER ECOLOGY AND INLAND FISHERIES BERLIN DEU, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Irstea Publications, Migration |
Jazyk: | angličtina |
Rok vydání: | 2005 |
Předmět: |
[SDE] Environmental Sciences
0106 biological sciences Ecology 010604 marine biology & hydrobiology Zoology 04 agricultural and veterinary sciences Aquatic Science Biology biology.organism_classification 01 natural sciences Sturgeon medicine.anatomical_structure Hermaphrodite Artificial reproduction [SDE]Environmental Sciences 040102 fisheries medicine 0401 agriculture forestry and fisheries Acipenser sturio Gamete 14. Life underwater Acipenser ruthenus Carp Sex ratio |
Zdroj: | Aquaculture Aquaculture, Elsevier, 2005, 246 (1-4), pp.263-273 |
ISSN: | 0044-8486 |
Popis: | International audience; Hormonal stimulation of sterlet sturgeon, Acipenser ruthenus, was carried out with carp pituitary extract at 2 and 5 mg kg−1 body weight for males on the one hand, females and hermaphrodites on the other hand. Within our experimental stock, reproductive performances defined by relative number of ovulated females, fertilisation rate, and relative number of good quality semen samples had begun to decline in fish older than 14-16 years. Ovarian cycle have proved to be mostly annual recurring cycles with a 1-year interval (40% to 50%) or 2-year interval (27% to 34%). Spawnable females ranged from 39% to 86% in our experimental period 1994 to 2000. Selection of spawnable females was mainly based on a minimum size of oocytes of 2.5-2.6 mm. For the first time, hermaphrodites have been reported in farmed sterlet sturgeon. Few sequential and simultaneous hermaphrodites have been observed. Most of the time both gametes proved to be functional in either mating. Embryonic survival of self-fertilised eggs ranged from 0% to 70%. Progeny was obtained twice. Out of 102 (1994) to 76 (2000) individuals representing an equilibrated sex ratio, 2 to 4 individuals, respectively, were hermaphrodites. The number of hermaphrodites increased with the age of the fish. Anatomical and physiological aspects are discussed. The modelling of our data demonstrates that fertilisation depends on gamete interaction, of which practical consequences are discussed. Artificial reproduction of hermaphrodite fish was confirmed by genetic analysis. Microsatellite analysis produced a homozygous excess of two alleles, both polymorphic loci. |
Databáze: | OpenAIRE |
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