Extraction valuable products from fish waste such as protein, lipid has gained more research attention around the worldwide. In this study, a fish waste was subjected to approximate analysis to determine the nutritional composition includes protein, lipid, and carbohydrates as well as moisture and ash content. The fish waste included scales, fins, and bones isolated from Cyprinus carpi fish samples. The fish samples were divided into three samples groups and named G1, G2, and G3.The results showed high protein content in fish waste and the highest value 27.3 % found in bones (G3). The highest value of lipid content also was recorded in bones 7%. The higher moisture content was detected in scales parts 73% accompanied with a significant difference (P-value <0.05) in the scales moisture contents among the three fish waste groups. In addition the results revealed that the protein and lipid content increased with increasing weight and size of fish. In general, this study presents a high nutritional value of fish waste, providing another a viable source for sustainable food industry.

This study was conducted during Dec2011-Nov2012 on three stations located in the south sector of Main Outfall Drain (MOD) River. Station 1 was near Al-Holandee Bridge which was the general carriage way in the center of Al-Nassiriya city, station 2 was 20 km far from the first station, while station 3 was in the beginning of the new branch. This study reveals the Seasonal Variation of Total petroleum hydrocarbons (TPHs) in both surface waters, sediment and it is related with trace metals nickel and vanadium in water (dissolved, particulate) and sediment (residual and exchangeable) phases. Also, the study shows the relationships between the concentration of Ni and V with Total Organic Carbon (TOC%) in the sediment.

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The present study was conducted in the Al-Garraf river in Thi-Qar governorate (October 2018 to March 2019) and aimed to investigate the pollution in the Al-Garraf river and the possibility of using some aquatic plants as bioindicator at three selected stations along the river. The study was achieved by measurement of air and water temperature, pH, and salinity, as well as the measurement of the concentration of some heavy elements (Cd, Pb, Ni, and Cu) in both dissolved and particulate phases in water and an exchangeable and residual phase in sediments and the tissues of two aquatic plants species, Ceratophyllum demersum L. and Phragmatis australis (Can.). The mean concentrations of the heavy elements (Cd, Pb, Ni, and Cu) in the dissolved phase in water were (0.07, 1.19, 3.17, and 0.03μg/l) respectively, while their concentration in the particulate phase was (15.73, 24.71, 65.63 and 22.86 μg/g) respectively. The mean concentrations of the heavy metals in sediments in an exchangeable phase were 15.73, 24.71, 65.63, and 22.86 (μg/g), respectively, while in the residual phase were 0.07, 0.85, 74.62, and 14.00 (μg/g) respectively. Results confirmed increased mean concentrations of heavy metals in aquatic plants tissues compared to their means in water. The maximum mean of heavy metals was recorded in Ceratophyllum demersum L. The Bioconcentration factor (B.C.F) values were more than their values of Biosedimentation factor (B.S.F) in all aquatic species.