The major objective of this experiment was to assess the effect of alternate plant protein sources as a replacement for fish meal in feed on the proximate composition of muscle, liver and tissue in Oreochromis niloticus.O. niloticus of average size (average Weight 45.00±1.25 g, total length 13.28±1.42 cm) were stocked in 100 L glass aquarium. Fish were fed with three experimental feeds (A, B and C) and reference commercial feed (D) for 16 weeks. Feed A, B and C was prepared from four different plant sources and fish meal (40 % crude protein).

Specimens of Clarias gariepinus were treated with lethal (70, 75, 80, 85, 90, and 95 mg/L)
and sub-lethal concentrations (8, 12 and 16 mg/L) of uranyl acetate, a low-radiotoxicity uranium salt. The
LC 50 value was registered as 81.45 mg/L. The protein and glycogen concentrations in liver and muscles
were decreased in the fi sh exposed to sub-lethal concentrations. The red blood cell (RBC) and white blood
cell (WBC) counts, haemoglobin (Hb) concentration and haematocrit (Hct) values were decreased. Diff erent

The organoleptic evaluation and proximate analysis of Cyprinus carpio and Clarias gariepinus were
determined in fresh fish and when refrigerated at two different temperatures (-21ºC and 4ºC) for a
period of six weeks. A panel of twelve trained judges evaluated the colour, texture, softness and
flavour of fish meat after two minutes of steam cooking. Average score revealed a general decline in
organoleptic properties such as colour, texture, freshness, and taste of Cyprinus carpio and Clarias

Concentrations of 10 heavy metals (Cu, Zn, Cd, Pb, Fe, Mn, Cr, Se, As, and Hg) were determined in
different organ tissues of four selected common red sea fish species viz., Lethrinus nebulosus, Cetoscarus pulchellus,
Plectorhynchus schotaf and Epinephelus spp. There was a highly significant (P< 0.01) difference among the 4 fish
species and between organs for the accumulation of all 10 metals. The concentration of Fe was highest closely
followed by Zn, whereas Cd was detected in the lowest concentration. The liver accumulated the highest concentration