Influence of sexual phenotype and genotype, and sex ratio on growth performances in tilapia, Oreochromis niloticus
| Autor: | Graham C. Mair, Jose S. Abucay, Alexis Fostier, Aboubacar Toguyeni, Jean-François Baroiller, Benoit Fauconneau |
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| Přispěvatelé: | Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement (SCRIBE), Institut National de la Recherche Agronomique (INRA) |
| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
medicine.medical_specialty
media_common.quotation_subject Population Physiology Aquatic Science 03 medical and health sciences 5. Gender equality Internal medicine medicine Sexual maturity education ComputingMilieux_MISCELLANEOUS 030304 developmental biology media_common 0303 health sciences education.field_of_study biology XY Genotype 04 agricultural and veterinary sciences biology.organism_classification Sexual dimorphism Oreochromis Gonadosomatic Index Endocrinology [SDV.SA.STP]Life Sciences [q-bio]/Agricultural sciences/Sciences and technics of fishery 040102 fisheries 0401 agriculture forestry and fisheries M12 - Production de l'aquaculture Reproduction Sex ratio |
| Zdroj: | Aquaculture Aquaculture, Elsevier, 2002, 207, pp.249-261 |
| ISSN: | 0044-8486 |
| Popis: | In tilapia, precocious sexual maturity associated with continuous and asynchronous reproductive activity often results in unwanted reproduction and overcrowding in ponds where the food supply is limited. This constitutes a major limitation in the culture of most tilapia species. Furthermore, divergent growth performances linked to sex are regularly observed. Males present better growth performances than females. The first experiment of the present study analysed the influence of sexual genotype on phenotypic male growth rates. Males with three different sexual genotypes were produced: YY 100 (YY male X YY female), XY 100 (YY male X XX female) and XX 100 (hormonally sex-inverted females). They were compared with classic (XY male X XX female) or all female (XX male X XX female) progenies. The objectives of the second experiment were to study the influence of social interactions through the use of different sex ratios: F100, F75, F50, F25, F0 (F100 = 100% females in the population). These two experiments were carried out in hapas implanted in pond with "Egypt-UCS" strain of Oreochromis niloticus. At the end of the first experiment (140 days postfertilisation), the XY genotype presented the best growth performances and YY genotype the lowest. Final body weights of neomale (XX100) were significantly (P |
| Databáze: | OpenAIRE |
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