Grading of tilapia fry prior to hormonal sex reversal treatment in Benin

Credit: Ismael Radwan (Egypt)

As established, the effectiveness of sex reversal process depends on several factors including the initial size (age) of treated fry. If the tilapia spawning and collection systems of the fry cannot guarantee the optimum size (age) of tilapia fry, a grading system will be required. The photo shows a simple grader which sorts the sizes of collected tilapia. The diameter of this grader is 2.5 mm whereas passed through tilapia fry are taken for sex reversal process while retained fry could be used in different farming systems.

Grading tilapia fry for sex reversal (Benin)



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