Iraqi Journal of Aquaculture

Fish farming methods that is suitable for the Iraqi marshes were
classified in two main categories: water based methods and soil based
methods. In the first category it was found that the floating net cages
could be used in the rivers and the main branches, while the fixed net
cages could be used in the shallowest water bodies. It was found that
there is a good opportunity to use the Enclosures and Pens. The
natural grazing method could be applied in the wide area all over the
marsh, especially in the area which is enclosed by dams. In the second
category the tidal ponds was found to be suitable in the lower parts of
Al=Hammar marsh, While the dyke ponds could be used in high lands
near the villages. It found that there was a good opportunity to use
fish farming in the draining systems, and Fish-Cum-Rice system in
the areas with agriculture activity. In addition the polyculture and
Integrated fish farming cane be used as an environment-friendly
techniques

Effect some of heavy metals ( Copper , Lead , Zinc) on
survival of fish Liza abu (Hickel ) have been studied and compared
with mixed effect of two elements in same concentrations (1 , 3, 5)
ppm. Synergism effect observed on mixed of (Cu + Pb , Cu + Zn )
while Antagonism effect at mixture of (Zn + Pb) . All of these
effects order as follows :
Cu + Zn> Cu + Pb > Pb + Zn.

The seasonal variations in algal compositions
quantitatively and qualitatively have been studied for
two stations in Alwnd River, represented before and
after passing Khanqeen city during eight months
starting
December 2000. A total of 123
phytoplankton taxa were identified, dominated by
diatoms (63 species) followed by greens (34 species),
blue-greens (15 species) and 11 species for other
groups. The total cell number of phytoplankton was
ranged between 34565 and 37940 cell/cm3 in both
stations with two peaks in spring and summer. The
higher density of cell number and species was
recorded in the second station during the studied
period.

This study focus upon the beneficial capability of brackish water embryonic
development hatching fish eggs embryo genes of common carp, Cyprinus carpio
( L.). different concentrations were used. (2-16‰). The aeration hatching technique
was used in the hatching of eggs, and the hatched larvae were incubated in the same
salt concentrations. The nursing was done in plastic containers for eight weeks in the
same salt concentrationsThe results showed that the higher ratio of development of
the embryos which was 94% at salt concentration of 6‰ after the first six hours of the
eggs incubation, and decreased to85.5% in the concentration of 6‰ after 48 hours of
incubation. The period of hatching of eggs ranged between 52-72 hours in the
concentrations 2-12‰ . The high survival ratio for larvae was 95 % at the salinity of
2 ‰, while the embryo died directly after hatching at the salinity 12‰.The duration
of yolk sac absorption for common carp larvae were ranged between 2-3 days at the
salinity of 2‰ and 5-7 days at the salinity of 8‰.The gas bladder of the common carp
appeared within 3-4 days at the 2 and 4‰ . average weight 1.9 g in the salinity of 4‰
and the lowest weight was 0.72g of salinity of 8‰The highest average daily weight
gain increased for common carp and it was 0.0344 g at salinity of 4‰.