The effects of different proportions of the 17β-estradiol and 17α-methyltestosterone on growth, sex reversal and skin colouration of the electric blue hap (Sciaenochromis ahliTrewavas, 1935)
| Autor: | Orhan Aral, Nihat Yeşilayer, Zafer Karsli |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
0106 biological sciences
biology 010604 marine biology & hydrobiology Live weight 04 agricultural and veterinary sciences Anatomy Sciaenochromis ahli Aquatic Science Sex reversal biology.organism_classification 01 natural sciences Feed conversion ratio Animal science 040102 fisheries medicine 0401 agriculture forestry and fisheries Fish medicine.symptom Methyltestosterone Weight gain Sex ratio medicine.drug |
| Zdroj: | Aquaculture Research. 47:640-648 |
| ISSN: | 1355-557X |
| DOI: | 10.1111/are.12524 |
| Popis: | This study was performed to investigate the effects of 17β-estradiol (ES) and 17α-methyltestosterone (MT) on growth, development, survival, sex ratio and colour change in the electric blue hap (Sciaenochromis ahli Trewavas, 1935). The hormones were not supplemented to the control feed, while six other feeds were prepared by adding 20, 40 and 60 mg kg−1 17β-ES or 20, 40 and 60 mg kg−1 17α-MT to each, resulting in seven different feed treatments. Average live weight of the fish supplemented with these diets was 0.42 ± 0.04 g. At the end of the study, the highest weight gain was observed in fish fed 60 mg kg−1 17α-MT group (2.62 ± 0.11 g) and the difference with the groups fed with 17β-ES was found to be significant. All fish fed 17α-MT were male, while the rates of feminization in fish fed 17β-ES at 20, 40, 60 mg kg−1 were 91.11%, 88.88% and 93.33% respectively. Survival rates were respectively determined as 80%, 95.56%, 84.44%, 93.33%, 77.78%, 84.44% and 84.44% for the control, 20, 40, 60 mg kg−1 17β-ES and 20, 40, 60 mg kg−1 17α-MT treatments. The best colouration was achieved in the 17α-MT groups (P |
| Databáze: | OpenAIRE |
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