Sex Reversal Hormone Sr Premix For Tilapia Culture
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Sex Reversal Hormone Sr Premix For Tilapia CultureThis advertisement is already inactive
- SR Premix
- A fry hormone-feed formulation for tilapia sex reversal
- Can produce 95-99% ,Male tilapia fingerlings in 21 days
- Fish grow and attain market-size with higher survival and shorter culture period.
1-k pack (good for treating 40,000 fry)
SHIPPING NOT INCLUDED
How artificial sex reversal is applied in tilapia? There are three basic steps in the application of artificial sex reversal in tilapia: (1) the production of fry for treatment, (2) the sex reversal treatment of the fry, and (3) the culture of the treated fish. (a) Production of fry To produce the right age of the tilapia fry for sex reversal treatment, a hatchery/nursery system is needed. For mouth-brooding species of tilapia fry (e.g., Nile and Mozambique tilapias), the breeding of the fish can be done using concrete tanks, earthen ponds and hapas (net enclosures) suspended in tanks or ponds. Breeders (50-250 grams each) are stocked at a sex ratio of three females to one male per square meter. After 10-12 days from stocking, the schooling (swimming in batches) fry about 9-11 millimeters (mm) in total length are collected and transferred to holding units (hapas and tanks) for conditioning and sorting (removal of extra large fry) in a day or two before sex reversal treatment. It is essential that the fry be not more than 12 days old from hatching or more than 12 mm in length prior to treatment for effectiveness. (b) Sex reversal treatment The three-week sex reversal treatment of tilapia fry can be done in indoor tanks or outdoor hapas in tanks/ponds. The fry are stocked at densities of 250-1,000 per square meter and fed the hormone-feed that can be prepared by the user or purchased from a commercial supplier. In the first week of treatment, the fry are stocked at 1,000 per square meter and fed at the rate of 30% of their body weight daily in four feedings given twice at 8 a.m. to 10 a.m. and twice at 2 p.m. to 4 p.m. at two-hour intervals. For l,000 fry weighing on the average 0.01 gram each at the start of the treatment, 3 grams of the hormone-feed are given daily in four feedings (twice in the morning and twice in the afternoon) for 7 days. In the second week of treatment, the stocking density of the post-fry (1822 mm in total length) is reduced to 500 per square meter to hasten growth. The feeding rate of 25% of fish total weight daily in four feedings as in the first week is applied. For l,000 postfry weighing on the average 0.05 gram each, 12.5 grams of the hormone-feed are given per day in four feedings. In the third week of treatment, the stocking density of the fingerlings (more than 25 mm in total length is further reduced to 250 per square meter and a feeding rate of 20% of total body weight of the fish is applied. For 1,000 fingerlings weighing 0.1 gram each, the amount of hormone-feed given per day in four feedings is 20 grams. For fast growth and high survival (70-80%) of the treated fish, good water quality should be maintained by replacing and/or cleaning the clogged-up net enclosures and providing for water change and artificial aeration when necessary. If properly applied, the sex reversal treatment can be 98-100% effective. (c) Culture of treated fish Following the sex reversal treatment, the fingerlings weighing on the average 0.5 gram can be stocked in nursery units for further rearing to larger sizes for cage/pen culture or stocked in grow-out ponds that should have no “wild fish.” The use of sex-reversed fingerlings allows for stocking rates that are higher than with mixed-sex fish. The usual preparations and management can be applied.
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