This experiment was conducted to study the drastic effects of graded levels
of aflatoxin-B. on growth performance, survival rate, feed and nutrients utilization, and
carcass composition of Nile tilapia, O. niloticus fingerlings. Also, it was conducted for
experimenting the inhibiting effects of graded levels of natural, cheap and available
two adsorbent agent, namely egg shells(ES) and shrimp wastes(SW) against the
adverse effects of atlatoxln-B, contamination of fingerlings diet fed for 8 weeks. The
effects of aflatoxin-B. (AFB1) were Significant decreases in body weight, average
weight gain, average daily gain, relative growth rate, specific growth rate, survival rate
and feed intake of the fish. Significant increases in corrected mortality rate and feed
conversion ratio were recorded. Also, significant decreases in protein efficiency ratio,
protein productive value and energy utilization were calculated. Reductions (P SO.01)
in dray matter, crude protein and energy content and increases (P sO.01) in ether
extract and ash of fish carcass were determined. The effects of either adsorbents at
levels of 1 and 2%, respectively were useful in reducing the toxic effects of AFBl on
fish via adsorbing the toxin from the fish diets, where it increased significantly the
body weight, average weight gain, average daily gain, relative growth rate, specific
growth rate, survival rate, feed intake, protein efficiency ratio, protein productive value
and energy utilization. Yet, it decreased (P sO.01) corrected mortality rate. However,
these adsorbents (at levels of 1% ES and 2% SW) alleviated the toxic effects of AFBl
on feed conversion ratio and carcass composition of the fish.