ISSN: 1812-237X

Volume 4, Issue 2

Volume 4, Issue 2, Autumn 2007, Page 59-116


GROWTH OF BLACK MOLLY POECILIA SPHENOPS (POECILIDAE: PISCES) REARED IN AQUARIA WITH CLOSED RECIRCULATING WATER

BASIM M. JASIM; NAJIM R. KHAMEES; NAWRAS A. A. AL-FAIZ

Iraqi Journal of Aquaculture, Volume 4, Issue 2, Pages 59-69

The experiment was conducted study the effect of temperature and food composition on growth, food conversion efficiency, food conversion rate and quantity of food intake by larvae of black molly Poecilia sphenops in closed recirculating water system Three types of food were employed. The first (I) was live food, brine shrimp Artemia, the second (II) was experimental artificial diet and the third (III) was commercial diet. The three diets were served under two temperature: (28±1°C and 22±1°C). Results showed that under temperature 28±1°C, the total weight increment and relative growth rate were 2.98-5.87 g and 1865.62- 3671.87 respectively. In the temperature 22±1°C these values were significantly lower (p<0.05). The I and II higher values than treatments III with significant difference (p<0.05) in both thermal degrees. In the temperature (22±1°C) the food conversion rate and efficiency rate attained 2.052 and 48.746 respectively in treatment II which were higher than that of treatment III (2.686 and 37.220 respectively), the two items were greater in temperature 28±1°C, and at treatment II (1.662 and 60.177 respectively) in comparison with the treatment III (2.220 and 45.064 respectively), the treatment II higher values than III with significant difference(p<0.05) in both degrees. The food intake larger in the 28±1°C than degree 22±1°C with significant difference for both treatments II and III, food intake in treatment II was larger significantly (p<0.05) than III at degree 22±1°C and non significantly (p>0.05) at degree 28±1°C.

FISH FARMING METHODS IN THE IRAQI MARSHES

Mustafa A. Al-Mukhtar

Iraqi Journal of Aquaculture, Volume 4, Issue 2, Pages 71-81

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.

MIXED EFFECT OF SOME OF HEAVY METALS ON SURVIVAL OF FISH LIZA ABU (HICKEL 1843)

M.A.R. AL-DOGHACHI

Iraqi Journal of Aquaculture, Volume 4, Issue 2, Pages 83-88

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.

SEASONAL VARIATIONS OF THE PHYTOPLANKTON IN ALWND RIVER – IRAQ

Fikrat M. Hassan; A. M. ISMAIL

Iraqi Journal of Aquaculture, Volume 4, Issue 2, Pages 89-99

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 through eight months starting in 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 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.

Effect of salinity on embryonic development eggs hatching rate and of larvael survival of Common Carb

K. I. Salh; A. R. M. Mohamed; Amir A. Jaber

Iraqi Journal of Aquaculture, Volume 4, Issue 2, Pages 101-116

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‰.