ISSN: 1812-237X

Volume 10, Issue 1

Volume 10, Issue 1, Spring 2013, Page 1-86

Effect of salt stress on energy usage and growth in grass carp Ctenopharyngodon idella (Valenciennes, 1844) and

Raghad S. Jaffar; Sumaya M. Ahmed

Iraqi Journal of Aquaculture, Volume 10, Issue 1, Pages 1-24

The present study was conducted on two species of cyprinid fish: Common Carp (Cyprinus carpio) and grass Carp (Ctenopharyngodon idella). The study includes the effect of increasing salinity on survival rate, oxygen consumption, glucose and total protein levels in blood plasma, energy usage, food consumption and growth rate. Common carp show more resistance to increasing salinity with 90% survival rate in 15 g/l salinity. While grass carp did not survive increasing in salinity more than 5 g/L. Increasing salinity was accompanied with decreasing total protein in blood plasma, increasing blood glucose, increasing oxygen consumption rate and increasing energy usage. Food intake was also decrease with increasing salinity which results in decreasing growth rate for both fish species. This study showed that salt stress negatively affect food intake, energy usage and decrease growth rate.

Mass culture of the rotifer Brachionus plicatilis under laboratory condition

A.H. H. Ghazi; Hala F. Hassan; Saba A. Khathem

Iraqi Journal of Aquaculture, Volume 10, Issue 1, Pages 25-34

In the present study the rotifer Brachionus plicatilis was cultured under controlled laboratory conditions, in Marine Science Center, Dept. of Marine Biology, the temperature was 22 ºC. The rotifers feeding on two type of food, the first was baker's yeast and second the animal manure. General, used the animal manure was better than baker's yeast. The density of rotifers culture at 22 ºC which fed on animal manure was 145 ind /ml, while growth rate was 2.67 and doubling time was 0.25 day. While, the density, growth rate and doubling time of rotifers culture at 22 ºC which fed on beakers yeast were 75 ind./ml, 2.01 and 0.34 day respectively. The importance of this study to determined the ability to depending on animal manure as cheap resource and available to improve rotifer growth compared with baker's yeast. Additional, to suitable period determined to culture of rotifer for supply it to larvae of fish and crustacean.

Levels of Pesticides in Sediment of Hor Al-Hammar Marshes, Iraq

Hamed T. Al-Saad; Abdulaziz M. Abdullah; Balqees Suhaem Al-Ali

Iraqi Journal of Aquaculture, Volume 10, Issue 1, Pages 35-54

The present study was included limitation, distribution, spread and resources of pesticides in water (Dissolved and suspended), sediments from three stations Al-harrir, Al-sulal and Al-burga). This study was extended from January, 2009 to December, 2009 during low tide times. The highest concentrations of pesticides in sediments was recorded for Lindane pesticides in February 497.5 µg/ kg and lowest concentrations 0.01 µg/ kg was found for Dialdrin in March at Al-harrir station and in November at Al-sulal station. Percentage ratio of total organic compounds (TOC) and grain size analysis of sediments was measured and Significant correlation (r = 0.98) were recorded between TOC% and total average of pesticides at tree stations and no Significant correlation were found between silts and total average of pesticides.

Processing of fish protein concentrate by using saline concentrates and study some of its quality

Ahmed Sh. Al-Hassoon

Iraqi Journal of Aquaculture, Volume 10, Issue 1, Pages 55-62

The aim of this investigation is to process a fish protein concentrate from a freshwater fish Tilapia zilli , the fish brought from local Basrah market , some of it minced , and the rest dried in the oven at 70 °c for 48 hr. , a saline solutions of 1% and 2% had been used to hydrolyze the fish flesh . The chemical composition of the fish were 56.86 % protein (N× 6.25) ,19.13% fat and 18.11% , while for the processed protein concentrates were 77.40% , 85.05% protein (N× 6.25) ,10.58% , 6.00% fat and 5.41% , 6.13% ash for the two saline concentrates 1% and 2% respectively . The obtained yield was 68.55 % of dried fish. The processed products were characterized with light brown color and acceptable fishy smell.

Field study of fish farming status in Basrah Governorate

Khaled H. Hasoni; A. A. Jabir; Mastafa A. Almaktar; Abdul Amer R. Jassim

Iraqi Journal of Aquaculture, Volume 10, Issue 1, Pages 63-74

Field survey of Aquaculture farms in Basrah governorate was done during 2007. The study showed that there are 80 fish farm with total area of 773.5 donum, while it was 16 fish farm during 2003. 75 % of the fish farms were less than 25000 m² (10 donum). 53.9 % was excavated pond, 34.2% concentration by half ground pools and 11.8 % was dyke pond. About 87.5 % of it using pump while 12.5 % used tidal current for water supply. This study showed that 95 % of fishes source was from Marine Science Center Hatchery and the other were from natural environment. The poly culture was main type and composed 93.75 of fish farm, the rest fish farm used the monoculture type. The total number of farmed fish during 2007 was 514625 fish, common carp Cyprinus carpio was the main species (63.5 %) followed by grass carp Ctenopharyngodon idella (22.6 %), silver carp, Hypophthalmichthys molitrix (10.8 %), Acanthopagrus latus (1.39 %), mugil sp. (0.33 %) and Barbus sharpeyi (0.13 %). Work men were 312 person 52.8 % have intermediate school, 23.9 % illiterate, 15.7 % primary, 4.2 % bachelor, 2.8 % Diploma and 0.35 % secondary school. Most of the aquaculture activity was concentrated in north Basrah especially in Al-Mudeina Shire and Al-Qurna Shir.

Effect of extracts of two aquatic plants Typha domingensis (Pers), and Lemna minor (Lamarc) on Ecophysiology of common carp Cyprinus carpio (Linnaeus)

Khadijah K. Haraib; Abdul Majeed H.Talal

Iraqi Journal of Aquaculture, Volume 10, Issue 1, Pages 75-86

This study aimed at investigating the impacts of aquatic extracts of two macrophytes Typha domingensis (Pers) and Lemna minor(Lamarc) on the Ecophysiology of the common carp Cyprinus carpio (Linnaeus) reared in waste water. A total of eighty fish were divided into four groups, each group consists of ten fish. Four treatment were used with two replicates of they were made as follow; waste water, clean water (control), waste water- extract of T. domingensis and waste water- extract of L. minor. Healthy freshwater common carp weighing about 35.75 ± 0.60g were obtained from the aquaculture station of Marine Science Centre /University of Basrah. Physicochemical properties of waters used were recorded and controlled. The diet given to waste water–aquatic plant extract groups was mixed for one night. Blood smears were taken. White blood cells/1 mm3 were counted by using Neubaur Improved Haemocytometer and light compound microscope. The results indicated that the number of white blood cells of common carp for the control sample was more than that of waste water. While the numbers of white blood cells of the fish in separately treated waste water with T. domingensis and L. minor extracts were close to the number of the control sample. Blood smears of fish reared in clean water (control sample), waste water- T. domingensis extract and waste water- L. inor extract seemed quite normal, where as the smear of the blood of fish reared in waste water showed abnormalities in the blood such as disruption of cell walls and deformation of the shape of red blood cell.