Cyclical changes in the histology of the gonads (ovary and testes) of African pike, Hepsetus odoe
| Autor: | E. O. Idowu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
endocrine system Gonad Ovary Biology 010603 evolutionary biology 01 natural sciences Applied Microbiology and Biotechnology Oogenesis Andrology Genetics medicine Molecular Biology Hepsetus odoe Primary Oocyte 04 agricultural and veterinary sciences Anatomy Oocyte biology.organism_classification medicine.anatomical_structure 040102 fisheries 0401 agriculture forestry and fisheries Vitellogenesis Agronomy and Crop Science Spermatogenesis Biotechnology |
| Zdroj: | African Journal of Biotechnology. 16:1032-1041 |
| ISSN: | 1684-5315 |
| DOI: | 10.5897/ajb2017.15939 |
| Popis: | Morphology, stages of maturation and histology of gonads of African pike, Hepsetus odoe from Ado Ekiti Reservoir were studied from August 2014 to July 2015 in order to establish its reproductive biology. Out of 685 specimens examined 354 were males and 331 were females giving a sex ratio of 1:1.1 (female:male). There was no significant difference (P>0.05) in the sex ratio. The gonads were in pairs. All the gonad maturity stages were encountered in both male and female gonads. These stages were; immature, developing, mature (ripening), ripe and running, and spent. Histology of female ovary showed that six stages were encountered in the oogenesis, namely, oogonium, primary oocyte, primary vitellogenic oocyte, secondary vitellogenic oocyte, tertiary vitellogenic oocyte and hyaline oocyte while in male spermatogenesis five stages were present which are; spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids and spermatozoa The oocyte diameter of H. odoe is higher when compared to freshwater fishes (the range was from 0.25 to 2.07 mean 1.74 ± 0.16 mm). All the five maturation stages occurred every month throughout the study period except the spent stage (stage V) which occurred only in October and ripe and running stage (Stage IV) which was absent only in December. This indicates that H. odoe is a multiple spawner in the reservoir. Key words: African pike, gonads, maturity stages, histology, oogenesis, spermatogenesis. |
| Databáze: | OpenAIRE |
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