An investigation on all male production of nile tilapia (Oreochromis niloticus) under the condition of brackish water in Bafgh
| Autor: | Bitaraf, Ahmad, Mashaii, N., Sarsangialiabad, H., Mohammadi, M., Alizadeh, M., Rajabipour, F., Sharifrohani, M. |
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| Jazyk: | perština |
| Rok vydání: | 2013 |
| Předmět: |
Male
Investigation Salinity Survival rate Bafgh pH Brackish water Oreochromis niloticus Temperature Body weight gain Total body lenght Aquaculture Iran Hormones Yazd province Dissolved oxygen Larvae Fertilization Methyl di hydro testosterone Mestanolone Nile tilapia Masculinization 17α-methyl testosterone |
| Zdroj: | Iranian Fisheries Science Research Institute |
| Popis: | This study was aimed to investigate the effects of different doses of two hormones and an anti-aromatase, i.e. 17a methyl testosterone (MT), methyl di hydrotestosterone (MDHT) or mestanolone and letozole in masculinization of Nile tilapia (Oreochromis niloticus) under the condition of brackish water in Bafgh station situated in Yazd province in center of Iran. Each experiment in this study was consisted of 5 treaments with 3 replicates each. A number of 1725 larvaes was distributed randomly among 15 replicates at the beginning of each experiment. Each experiment lasted 45 days and the larvaes were reared in aerated flow-through pots and fiberglass tanks filled with brackish water. The averages for temperature, salinity, pH and dissolved oxygen of water were 26.9 ê, 8 g/l, 7.6 and 5.78% respectively during this study. In experiment 1, three different doses of 40, 60 and 100 mg MT/k of feed were fed to different groups of 7 day post fertilization (dpf) larvaes for 45 days from the beginning of the experiment. The results showed that the larvaes in 40 mg group were 100 percent masculinized based on squash test performed at the end of the experiment but masculinization rates of those in 60 and 100 mg groups were 99.7 and 96.2 perecent respectively. Based on Dunkan test, total body length and weight averages measured in biometry 3 (at the end of the experiment) were not significantly different among groups but in biometry 2 (30 days after the beginning of experiment), they were significantly lesser only in 40 mg group (P |
| Databáze: | OpenAIRE |
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