Study the effect of three different levels of adding a fishmeal protein concentrate on the growth rates of the common carp fish (Cyprinus carpio) through laboratory experiments, which lasted for 40 days. 27 common carp fish were used with a weight of 2 ± 93.27 g and distributed over 9 concrete ponds with a capacity (300) liters, according to three treatments T1, T2, and T3 distributed in three replicates for each treatment, and put 9 fish (3 fish / repeated). The fish were fed on three different diets, with a protein concentrate ratio of 23%, 15% and 10%, respectively. Measurement of weight, relative specific growth rates and food conversion rates. The best total weight gain increase for the second treatment was recorded (35.478 ± 2.29 g). The best relative growth rates were (37.769 ± 2.51) and specific (0.346 ± 0.02)% g/day and protein efficiency ratio ( 2.365 ± 0.23) for the second treatment also, and significant differences were recorded at (P <0.01) on the two treatments T3; T1 in all the studied characteristics.

Laboratory experiments were conducted to compare the growth performance and feed efficiency of two groups, old (H1) and new (H2) of common carp Cyprinus carpio L. (97.37+0.33 g). Fishes of the H1 introduced to Iraq in 1982 and then their reproduction and farming began on a large scale, while fishes of the H2 was introduced to Iraq in 2009 by Inmaa Agricultural Enterprises Organization. H2 group indicated significantly (p<0.05) better performance in several studied parameters which included specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER), protein productive value (PPV), total apparent digestibility and apparent digestibility of protein and carbohydrates. This group also recorded significant (p<0.05) lower feed satiation level and fat deposited in the body compared to the old group (H1). Results of the current experiment concluded that there is a clear higher efficiency of the group H2 in most studied growth and feed efficiency parameters, which indicates the possibility of obtaining higher productivity and better economic profits when used in farming activities.

استخدم تراكيز مخففه من مستخلص عصير الأناناس بتراكيز0.0001،0.0005 ، 0.001، 0.002 ،0.005 ،0.01 سم3/لتر، لمعاملة بيوض اسماك الكارب الشائع  (Cyprinus carpio L.)لغرض إزالة المادة اللزجة مقارنة مع استخدام محلول الإخصاب والتانين 0.5 غم/ لتر. اظهرت النتائج إمكانية استخدام مستخلص الأناناس بتركيز0.001 ،0.002،0.005، 0.01 سم3/لتر حيث بين ان معدل الإخصاب والفقس في التراكيز( 0.005 ، 0.01 سم3/لتر) أعلى من البيوض التي تم معاملتها في مادة التانين والتي لم تختلف معنويا عن التركيز( 0.001 ، 0.002 سم/لتر) وأظهرت النتائج أيضا بقصر فترة حضانة البيض(الفترة اللازمه للتفقيس) لجميع التراكيز المستخدمة لمستخلص عصير الأناناس مقارنة مع معاملة السيطره.

One of the most important problems during artificial reproduction of Common carp is the adhesion of its egg. Disposal of adhesive material on eggs increasing its hatching rate activity. In this research three different concentrations of Strawberry Juice were used (10, 15 and 20% respectively) to treat the eggs of Common carp fish in order to remove the adhesive materials comparing with the control (salt, urea and Tannin solutions). The results showed that using Strawberry Juice after eggs fertilization with concentration of 20 and15 % have the possibility of removing the adhesive substances with short time of about 5 and 7 minutes respectively with significant effect ( p>0.05) as compared with the control treatment which it takes about75 minutes to remove this substance. While the concentration of10 %the adhesive materials were not removed. Additionally there was a surpassing effect (p>0.05) at the rat of eggs fertilization and hatching in the both concentrations (15%; 20 %) which was higher than that treated with Tannin and fertilizing solution, and the results also showed that eggs at the two treatments (T2 and T3) with Strawberry Juice , have a shorter period of incubation which was(66 and 64 hours)as compared with the control (71 hours to hatches at 22Cº).