Mixed-sex Nile tilapia (Oreochromis niloticus) can perform competitively with mono-sex stocks in cage production
نویسندگان
چکیده
All-male tilapia stocks are widely used by farmers to supply both domestic and international markets with homogenous, large sized fish (500 g+). While a number of strategies possible, hormonal treatment fry 17α-methyltestosterone (MT) is the most common method commercial due its low cost ease application. However, contrasting current widespread use, implications MT in farming have raised concerns especially from public environmental perspectives. Therefore, this study we tested impact stocking mixed-sex fast growing strain Nile (Oreochromis niloticus) at high density then grading out females 4 or 8 weeks intervals during grow-out compared final production standard MT-treated mono-sex system. From perspective, remove were successful as no differences harvest weight, survival feed conversion rate observed when group. Similarly, obtained terms external appearance, Fulton's condition factor, gonadosomatic index, fillet yield, fat-somatic index visceral-somatic (%) between MT-monosex group groups where removed (4 weeks). financial analysis approach showed that additional costs (fry, labour) involved strategy resulted lower profits. This could be mitigated if proportion sold premium price potential broodstock. In model presented, sales 13% for broodfish Thai prices, least 8% non-sex-reversed product would sufficient system return higher profit than The latter also enable further social licence through use small nutritional outgrower initiatives.
منابع مشابه
OVER-WINTERING GROWTH PERFORMANCE OF MIXED-SEX AND MONO-SEX NILE TILAPIA Oreochromis niloticus IN NORTHEASTERN BANGLADESH
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ژورنال
عنوان ژورنال: Aquaculture
سال: 2022
ISSN: ['0044-8486', '1873-5622']
DOI: https://doi.org/10.1016/j.aquaculture.2022.738315