Impact of Dietary Nutmeg (Monodora myristica) Seed Extract on Growth Performance, Immune Response, Gut Morphology, Liver Indices, and Hematological Parameters in African Catfish (Clarias gariepinus)
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Abstract
The use of synthetic chemicals as growth promoters and immune boosters in intensive aquaculture has significant negative impacts on the aquatic environment and poses potential risks to human health, necessitating the need for organic alternatives. This study investigated the effects of ethanol extract from Monodora myristica seed (EMM) as a growth promoter, immune booster, and gut area modulator in African catfish (Clarias gariepinus). The crude extract was obtained using a conventional method from finely ground, dried seeds of M. myristica. The extract was incorporated into a 40% crude protein diet at inclusion levels of 0.00% (M0), 0.05% (M1), 0.10% (M2), 0.15% (M3), and 0.20% (M4). These five diets were randomly assigned to triplicate groups of C. gariepinus (2.32±0.03 g), housed in 15 plastic aquaria for 84 days. Results showed that growth performance and feed conversion ratio were improved in the M2 group. Fish fed EMM diets also exhibited increased gut absorption area. Changes in the haematological indices, serum biochemistry, and liver oxidative biomarkers indicated enhanced anti-oxidant and immune responses with EMM inclusion. Specifically, total protein, glutathione peroxidase, glutathione, and glutathione S‐transferase levels significantly increased (p<0.05). Survival rates were higher in M2 and M3 (91.00%) than in the control group (86.67%). This study highlights the positive effects of EMM inclusion at a moderate concentration (0.10%) in the diet of C. gariepinus, particularly on immune response and survival rate.
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