Iraqi Journal of Aquaculture

This study was conducted to determine the influence of oil sources on growth performance of fish common carp Cyprinus carpio. Four diets were formed which similar in their protein content and contains four different sources of oil which [Corn oil (A), palm oil (B), sunflower oil (C) and fish oil (D)] 64 fish average weight ranged between (1.598 - 1.544) g were distributed randomly on eight plastic circular form basins with capacity of 20 liters of water. Feeding fish have been tested diets on the rate of 5 % of body weight by repeating each treatment for a period of 42 days. The results showed that there is no significant difference between the treatments (p>0.05) in the values of the final weight, specific growth rate, relative growth rate and food conversion rate. As the weight increase was no significant differences (p>0.05) between treatments (A, B, C), the treatment D (fish oil) was better than treatments (B, A) with significant difference (p<0.05) and did not different.

The biological aspects for the semen of males (Cyprinus carpio) were assessed during the spawning season, after they were artificially induced for spawning. The males were induced for insemination by injecting with Ovaprim and pituitary gland extract. Two dosages had been used 0.5, 0.3 ml and 2,4 mg per Kg of body weight respectively. After that the volume of semen, pH, number of sperms in one ml and motility were estimated. The total volume of semen obtained from males ranged between (72 – 117) ml by using Ovaprim and pituitary respectively. while the average concentration of sperms changed between (35.3 ± 9.1)×109 sperm /ml to (28.2 ± 5.2)×109 sperm /ml for the Ovaprim and PG respectively. The mean of Spermatocrite value was (65.3 ±15.8) % for Ovaprim and (52.33 ±10.4) % for PG. The average motility of sperm fluctuated between (90 ±10) % and (95.4 ±5.6) % for semen was obtained from males injected by Ovaprim and pituitary respectively. The effectiveness period of sperms ranged between (101± 30.9) sec and (113±34.2) sec for the two hormones respectively. This study indicated that the males in this range of length and weight had semen suitable for the hatchery requirements.

This study showed that the natural food could be used successfully in the rearing of Al- Gattan larvae (Barbus xanthopterus). Some types of life food were collected by by different nets, the collection site was a fish pond manure by liquid cow manure. The life food was used for the feeding of Gattan larvae and compared with artificial food coming to these pond liquid manures of cows. At the end of experiment (28 days), the results showed the average weight and length of larvae when fed on rotifer were 25.6 mg / larvae and 29.3 mm / larvae respectively. While the lowest average weight and length were for the larvae which fed on artificial food, 12.4 mg / larvae and 18.5 mm / larvae respectively. The survival rate for larvae fed on rotifer; phytoplankton and artificial food were 85, 79 and 65 % respectively.

Copolymers between polylactic acid and polyethylene glycol, also alganic acid and polyethylene glycol were synthesized and disocynate (MDI) were prepared and characterized. Swelling behaviors and loss of weight of these polyurethanes were studied by immersion of the gels in various buffer solutions. Particularly the polyurethane foam showed the highest EWC (equilibrium water constant) in timedependent and pH-dependent swelling.