Samples of frozen fish available in Kirkuk markets Shad Tenualosa ilisha (Hamilton), Mackerel Trachurus trachurus (Linnaeus), Rainbow trout Oncorhynchus mykiss (Walbaum) and striped catfish (Pangasianodon hypophtholmus (Sauvage). They collected for the period 1st May 2015o 30th January 2016 at weights average between 650-1250 g. The results showed many of carcinogenic and non-carcinogenic hydrocarbons compounds; Rainbow trout contained seven and nine of hydrocarbons compounds in the extracts of hexane and ethanol respectively, among them, there were five carcinogenic hydrocarbons in the ethanol extract and three in the hexane, their values ranged between 0.234-19.707 and 0.419-2.972 ng.g-1 dry weight respectively. Numbers of the hydrocarbons ranged between 4-6 in other fish species. This may due to the differences of nature of feeding among the fish species and the differences in their fat content. In Shad fish, the results have recorded one carcinogenic compound in the ethanol and five in the hexane, the concentration of Benzo (a) pyrene reached 24.23 ng.g-1 dry weight which is the most dangerous component among carcinogenic compound. Mackerel containsive compounds of hydrocarbons in the hexane; Four of them belong to the non-carcinogenic group and sixn ethanol, ive of them are non- carcinogenic. This study showed that differences in the numbers and concentrations of aromatic hydrocarbons in the studied fish. This is due to several reasons such as occurrences of fish near to the sources of hydrocarbons pollution the nature of fish feeding and living.
The purpose of this study was to determine the effect of supplementing the diet with Thepax Aqua (Aqualase) on the development and survival of juvenile common carp (Cyprinus carpio L.). Therefore, an eight-week nutrition experiment was carried out using the Thepax Aqura enzyme in the Department of Vertebrates, Marine Science Center, University of Basrah. This enzyme was supplemented at 1, 2, and 3% in the control diet. The maximum weight growth (3.9870 gm 0.1230) and Specific Growth Rate (0.4238 gm 0.0049) were seen in the fish fed with T1 diet, and these results were found to be statistically different (P<0.05) from those observed in the fish fed with T2 (2 %), T3 (3 %), and T0 (control) diets. This study also concluded that there was no significant effect (P≤0.05) for enzyme levels on the survival of juveniles carp fed with different dietary enzymes. Finally, the outcome of the current experiment showed that the 1% supplementation of Thepax Aqua to the food gave good growth and feed utilization of Juveniles of carp C.carpio.
Oreochromis aureus (Steindachner, 1864) fingerlings. The average weight of 5.19 ± 0.09g of each fingerling was cultured in the Recycle Aquaculture System (RAS), which consisted of 18 plastic tanks with a water volume of 54 litres, for 70 days (December 18th to February 23rd). The results showed that more than 80-100% of the fish survived at 1.2 to 20g/l salinity and at both temperature treatments. The results showed an increase in the growth of tilapia with increased temperature in low salinity (1.2 and 10 g/l) and a decrease in growth with higher salinity (20g/l). The best food conversion rate (FCR) was 2.6157 ±0.2002 and 2.9865 ±0.0114 at treatments of 30 and 18°C respectively with salinity of 10g/l. The study concluded that temperature and salinity have an effect on the growth performance and survival rate of blue tilapia fingerlings. The ability of blue tilapia to use saline water up to 10g/l makes it an ideal candidate for brackish water production. Therefore, blue tilapia may be an alternative species for aquaculture in southern Iraq.
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