Ugwem GABRIEL, Ojo AKINROTIMI, Yusuf MOMOH
Over 200,000 of Clarias gariepinus two-week old hatched fry were sorted at different ages i.e 2, 3, 4, 5 and 6 weeks using nine differet grading tools, namely Dipnet (DN), grading cage (GC), hang grading net (HGN), meshed box (MB), plastic basin (PB), plywood box (PWB), sorting table (ST), woven basket (WB), and wood grading panel (WGP). The result from the study indicated that sorting table (ST), grades faster in all the age of the fry, having the highest number of graded fry. In all the ages, plastic basin (PB) consistently had the lowest. The highest mortality values were observed in sorting table (ST) in all the ages of fish sorted while the lowest values were recorded in grading cage (GC). The success of the grading cage (GC) was that it grades more efficiently through the bottom unlike other sorting tools which gradel through its sides. Clarias gariepinus fry between the age of 2 and 4 weeks is best graded using the grading cage for high survival rate and sorting table is best used with fish from the age of 4 weeks and above.
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