ISSN: 1812-237X

Volume 5, Issue 1

Volume 5, Issue 1, Spring 2008, Page 1-40

Survey of fish enemies from three fish farms in Iraq III. Impacts of predaceous water birds on cultivated fishes

J. M. Abed; N. K. Salem; Sadek Ali Hussein

Iraqi Journal of Aquaculture, Volume 5, Issue 1, Pages 1-12

The present investigation concerned with a thorough survey on the serious impact of the predaceous water birds from three selected fish farms in the country, namely Al-Manahel fish farm (presently called Al-Beilad) in Babylon province, Basrah University/ Marine Science Center fish farm and Al-Mutawaa fish farm. The latter two are situated in Basrah governorate. Samples were collected on monthly basis for the period from January to October 2002. Impacts of water birds on stocks of cultivated fish species and other faunal components was detected. Stomach of seven species of water birds, namely, herring gull (Larus argentatus), black headed gull (L. ridibundus), slender billed gull (L. genei), little gull (L. minutus), great white heron (Egretta alba ), little egret (E. garzetta) and cormorant (Phalacrocorax carbo sinensis) were examined to calculate food consumption. The study reveals that herring gull occupied first rank in Al–Manahel fish farm followed by cormorant which occupied first rank in Basrah University farm. Fishes formed 100% in food of cormorant, herring gull, black headed gull and slender billed gull. Shrimp was detected in food of little gull and little egret while frogs were consumed by great white heron and little egret. Cormorant occupied first rank in food menu for each birds followed by herring gull and slender billed gull.

Culture of Grass Carp Ctenopharyngodon idella Val. in Fadak farm –Basrah / Iraq

Mustafa A. Al-Mukhtar; Jassim H. Saleh; Khaled H. Hsooni; Ali T. Yasin

Iraqi Journal of Aquaculture, Volume 5, Issue 1, Pages 13-20

32 thousands of juveniles of grass carp Ctenopharyngodon idella were reared in Fadak fish farm of about 15 g. They were transferred from fish culture station in Marine Science Center and spread equally in four ponds each of 8.5 donum. The culture density was 940 fish /donum in the period 15/ May to 15/ December 2007. Total fish weight for the nearest milligram was taken monthly. Fishes were fed daily with the green alfalfa as a main food item in a rate of 8-15% of the body weight and aquatic plants as Pharagmites australis and Ceratophyllum demersum. Results at the end of experiment show that the average of total weight for each fish in the four ponds reached 1153.79 ± 4.78 gm while the daily weight increase rate varied along the months of experiment from May until December, where it noticed starting from half of June until half August where it reached 1.5± 0.221 gm/day, 4.6 ± 0.712 gm/day and 7.6 ± 0.312 gm / day respectively then it starts to decrease during September until December Relative growth rates show a progressive during the first seven months. On the other hand he specific growth rate showed its highest rates during July (4.6 ± 0.081 %/day).

Processing of Protein Concentrate from Some Poultry Wastes

Ahmed Sh. Al-Hasoon

Iraqi Journal of Aquaculture, Volume 5, Issue 1, Pages 21-28

The present study aims to utilize the poultry wastes (heads & legs of chicken) in the production of protein concentrate. The chemical contents and functional properties of the final processed product were evaluated. The chemical method had been used in protein concentrate processing which included digestion of raw materials with 5 % HCl at pH 4. The chemical composition of dried poultry refusals were 46.38% protein ( N×6.25), 22.34 % fat and 8.46 % ash, while that for the processed. Protein concentrates were 77.81 % protein (N×6.25), 6.75% fat and 10.20 % ash. The obtained yield was 39.4 %. The processed product is characterized with brown color and acceptable light chicken smell, and also showed good strong stability after 90 days of storage at 28 ºC, 10 ºC and -4 ºC without objectionable changes in both color and smell. The processed product also had low total bacterial counts which were 424, 405 and 387 CFU/ gm after 90 days for the above degrees respectively, as well as c. form bacteria was not detected. The total volatile nitrogen bases (TVNB) were 8.8, 8.7 and 8.3 mg N/100 gm, while TBA values were 0.288, 0.288 and 0.283 mg melon aldehyde / kg at the same above mentioned storage temperature respectively.

Preliminary Observations on the Sperm Biology of (Bunnei Barbus sarpeyi, 1874) after Hormone Injection and Preservation

Faleh M. Al-Zaidy; Saged S. Al-Noor; Mustafa A. Al-Mukhtar

Iraqi Journal of Aquaculture, Volume 5, Issue 1, Pages 29-32

Observations on the sperm biology of Bunnei (Barbus sharpeyi), after hormone injection perm activity for the injected fish ranged between 85 % - 100 %. The most amazing finding was the sperm activity of the collected semen from deceased fish after one hour was 90 %, and it has the highest activity time(120 sec.), this time was higher than that for the Bunnei from Al-Therthar reservoir during spawning season. The sperm volume was very low (1- 0.4 ml). which is a characteristic of this species. The sperm concentration ranged between (25.85 - 40.69) × 109 , and it is also higher than that for Bunnei in Al-Therthar reservoir.



Iraqi Journal of Aquaculture, Volume 5, Issue 1, Pages 33-40

The study is based on Samples of Rotifera collected from three ponds located inside the University campus, Garmat Ali region Basrah, Iraq. The samples
were investigated for the density changes and for the diversity. There were found 26 species of Rotifera belong to 20 genera. The maximum recorded density was (51 ind. / l) which observed in May/2006 at pond 1, whereas the minimum density was (0.6 ind / l) recorded at pond 1 in November/2006. The total density was (225 ind. / l) at pond 1. It was found that the diversity of Rotifera (no. of spp.) is greater at pond 2 and pond 3 compared with pond 1. There were 22 species at pond 2 and pond 3 but only 9 species at pond 1.