The effect of feeding and starvation on growth, gross body composition and htty acid composition of body muscle and liver were investigated in juvenile African catfish (Clurius guriepinus). The relative composition of fatty acids was influenced by starvation. In both liver and muscle there were marked relative decreases of 14 : 0, 16 : ln9 and 18 : In9 fatty acids and relative increases of 20 : 5n3 and 22 : 6n3 when these were compared to the controls. Preference of utilization of fatty acids from liver and body muscle during starvation was highest for 14 : 0>16 : ln9>18 : ln9 and conservation highest for 22 : 6113220 : 5n3. The changes of these fatty acids were smaller in muscle than in the liver.

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The present study was carried out to find the status of different soil quality variables of coastal shrimp culture pond at different tidal marks of Chakaria, Cox’Bazar during the period from August 2012 to July 2013. The values of different soil quality variables such as sand, silt, clay, pH, organic matter, NO2-N, PO4-P, exchangeable K+, Soil compactness, bulk density, particle density, porosity and Field water capacity fluctuated between 2.04-43.88%, 30.80-55.36%, 23.98-49.94%, 5.9-8.9, 1.62-9.95%, 4.01-9.92 ?g/Kg, 1.14-3.50 ?g/Kg, 0.82-1.74 meq/100g, 14.00-31.5 cm, 0.80-1.21 gcm-3, 2.11-2.74 gcm-3, 52.7-65.97% and 44.27-78.18% respectively. Significant differences (p<0.05) in the values of sand, silt, clay, bulk density, porosity, NO2-N and field water capacity of soil of the culture ponds at tide marks were observed. Strong correlations between soil bulk density vs sand (0.863), field water capacity vs clay (0.845), field water capacity vs silt (0.797), exchangeable K+ vs PO4-P (0.787), porosity vs field water capacity (0.769) and porosity vs clay (0.705) were found at 0.01% level of significance.J. Asiat. Soc. Bangladesh, Sci. 42(1): 21-27, June 2016

The experiment was carried out to produce and assess the storage quality of microbial silages from three animal wastes namely fish offal (FO), chicken gut (CG) and shrimp head (SH) using yoghurt as dietary fishmeal (FM) replacer for aquaculture. There was prevalent relationship between decreasing of pH and silage process that was analyzed by One-Way ANOVA as the alpha level (p<0.05). Ensilage process was completed within 14-21 days and three liquefied silages of desired pH level (<4.5) were obtained. The crude protein content found was highest in shrimp head silage (31%) followed by chicken gut silage (30%) and fish offal silage (16%) while highest crude fat was found in fish offal silage (69%) followed by shrimp head silage (53%) and chicken gut silage (43%) respectively. Total amount of essential amino acids (EAA) in chicken gut silage was found highest (9.33 g.100 -1 protein) followed by shrimp head silage (8.91 g.100 -1 protein) and fish offal silage (4.70 g.100 -1 protein) respectively. During 90 days storage, pH was found to be stabilized below 4.5, no change in color and smell and no sign of putrefaction in the produced silages were seen. The results of proximate composition including EAA reveal that produced silages have potentials to be used as protein supplement in aquafeed.