Iraqi Journal of Aquaculture

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

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

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.

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%).

Among 600 bunnei fishes transferred from Qurna
marshes to fish ponds at Basrah University/Marine Science
Center, 211 fishes were infected with saprolegniasis during
the period from January to March,2005 constituting a
percentage of infection of 35.1% which was diagnosed by its
clinical features and by direct examination with 10% KOH
solution and by culture. The cultutred fungus was
Saprolegnia parasitica.