Effects of graded activated charcoal in rice husk diets for mud catfish, Clarias gariepinus juveniles (Teleostei: Clariidae)

Muyideen Owonire LAWAL, Ademola Zaid ADEROLU, Toheeb Tomiwa ADESOLA


This study investigated the growth performance, nutrients utilization and haematology of Clarias gariepinus juveniles fed with graded activated charcoal (AC) in rice husk (RH) diet. Eight diets were formulated; Control diet 1 (without RH and AC), Control diet 2 (+AC), Diet 3 (2.5% RH), Diet 4 (2.5% RH+AC), Diet 5 (5.0% RH), Diet 6 (5.0% RH+AC), Diet 7 (7.5% RH), Diet 8 (7.5% RH+AC). Diets were fed to triplicate groups of ten fish per tank thrice daily to satiation for eight weeks. Fish fed Diet 4 recorded highest values for mean weight gain (MWG) (75.71±1.76g), SGR (2.40±0.03%/day) and PER (3.22±0.15) while fish fed Diet 7 had the least values for MWG (59.50±1.21g), SGR (2.09±0.03g) and PER (2.39±0.10). The AFI did not record significant difference (P>0.05) while FCR had significant difference (P<0.05) across diets, with Diet 4 having the best value for FCR (0.86±0.04). Diets of RH lower cholesterol, PCV and Hb levels in the experimental fish though, the inclusion of AC to the test diets resulted in a non-significant increase in the levels of these parameters. The values of WBC and RBC did not show significant differences (P>0.05) amongst diets however, Diets 1 and 2 recorded the highest values for WBC (14500±707.11) and RBC (6.15±0.91) with the least values (9000±2828.43 and 5.15±0.21, respectively) for these parameters recorded with Diets 3 and 7. The improved growth recorded at 2.5% inclusion level of AC suggests that activated charcoal could favourably be added to the feed of C. gariepinus juveniles.


Growth performance, Haematology, Nutrients utilization Catfish, Fisheries.

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