ISSN: 1812-237X

Volume 2, Issue 2

Volume 2, Issue 2, Autumn 2005, Page 1-108


DISTRIBUTION AND COMPOSITION OF ZOOPLANKTON IN EUPHRATES RIVER NEAR AL-MUS AIB POWER STATION

M.R. NASHAAT; A.A. AL-RUDAINY; A.A. AL-LAMI; A. G. RAHDI

Iraqi Journal of Aquaculture, Volume 2, Issue 2, Pages 1-20

Quantity and quality composition of Cladocera were studied throughout a period from July 2002 to March 2003. Three sites in Euphrates near Al-Mussaib power station were selected (S1, S2 and S3). The present study recorded 38 taxa of Cladocera, belonged to 15 genera , some of these were dominant as Alona , Ceriodaphnia and Daphnia. The species of Alona guttata, Chydorus gibbus and Scapholeberis kingi occurred at all sites throughout the study period . The highest mean values of bio-diversity (2.94) were recorded at S1 below the thermal effluent compared with other two sites. The present study showed variation in the composition of the community due to the effluent of Al-Mussaib power station in Euphrates river.

STUDY ON SOME HEAMATOLOGICAL CHANGES IN CYPRINUS CARPIO ( L. ) FISH AFTER EXPOSURE TO DIFFERENT CONCENTRATIONS OF SUMCIDIN FENVALERATE ( 20% ) PESTICIDE

M. A.A. Banai; M.F.AL-ALI

Iraqi Journal of Aquaculture, Volume 2, Issue 2, Pages 21-33

C. carpio fish was exposed to different concentrations of sumcidin pesticide ( 0.005 , 0.05 and 0.5 ) mg l . All treatment fish was showed oscillation in rates some of hematological parameters in present study compared with control fish . Red and white cells , hemoglobin , P.C.V. , M.C.V. and M.C.H.C. were showed decrease in their rates averages in treated fish compared with control , abnormality shapes in red blood cells in exposure fish to Sumciden pesticide observed compared with control .

EFFECT OF SALINITY ACCLIMATION ON FOOD INTAKE, DIGESTIBILITY AND EVACUATION RATE IN LIZA ABU JUVENILES

F.A.H.MOHAMED; A.Y.AL-DUBAIKEL; S.M.AHMED

Iraqi Journal of Aquaculture, Volume 2, Issue 2, Pages 35-45

The results obtained for the juveniles of Liza abu showed that in high salinity there was a decrease in food intake (1.88%) compared to low salinity (7g/l) and tap water (1.5g/l). Also the total digestibility decreased 10% with increasing salinity from1.5 to 15 7g/l as a result of increasing the evacuation rate, where values reached 88.39% and 90.3% from total faces weight in salinity 7 and 15 g/l respectively after 18 hrs.

ANALYTICAL STUDY OF THE FISHERIES IN THE LOWER REACHES OF THE TIGRIS RIVER, NORTH QURNA, BASRAH, IRAQ

R. A. K. FARIS; yahoo.com; Saged S. Hassan saged; A.R. M. Mohamed

Iraqi Journal of Aquaculture, Volume 2, Issue 2, Pages 47-66

The fisheries of the lower reaches of Tigris river, north Qurna in Basrah Governorate have been analyzed during the period from January to December 2005. The fishing boats used there varied in lengths form 5 to 10m, of which 50% were motorized with 25-75 HP. Seine and drift gill nets are the main fishing gears used, their lengths ranged from 100 to 200m with mesh sizes of 14-100mm and 7-32mm for seine and gill nets respectively. The number of fishermen in each boat varied from 1 to 7. Twenty three fish species were recorded caught in the area, of which eight were marine species, belonging to twelve fish families, in addition to shrimps. The total catches ranged from 629Kg in January - march to 3335Kg in July- September with total catch of 7671Kg. Three species namely catfish Silurus triostegus, crucian carp Carassius carassius and khishni Liza abu comprised 86.93% of the total catches constituting 69.65%, 11.02% and 6.26%, respectively. The average catch per unit of effort was 19.8 Kg/hr/100m for seine nets and 2.42 Kg/hr/100m for gill nets. The diversity and evenness indices for biomass were 1.0 and 0.33, respectively, in July-September and 1.5 and 0.52, respectively, in October-December. The highest similarity index of species composition was between April-June and July-September (87%), and lowest between April-June and January-March (63%).

FOOD AND FEEDING ACTIVITY OF ILISHA MEGALOPTERA LARVAE IN SHATT AL-ARAB ESTUARY

N. A. Hussain; M.T.AL-OKAILEE; S.M.AHMED

Iraqi Journal of Aquaculture, Volume 2, Issue 2, Pages 100-108

The guts of 110 specimens of Ilisha megaloptera larvae ranging in length between 6-21mm were examined. The study showed that I. megaloptera in the larval stage is phytoplankton feeders, consume mainly centric and pinnate diatoms, with centric diatoms being more important that pinnate especially in the smaller size larvae. Spatial and seasonal variations showed that there were no differences in the incidence of feeding during the survey in all stations sampled. This study showed that larval I.megaloptera appear to select food of a certain type (diatoms), which do not vary with the larval size.