ISSN: 1812-237X

Volume 4, Issue 1

Volume 4, Issue 1, Spring 2007, Page 1-69


QUANTITATIVE AND QUALITATIVE VARIABILITY OF EPIPHYTIC ALGAE ON THREE AQUATIC PLANTS IN EUPHRATES RIVER, IRAQ

J. M. SALMAN; M. M. SALAH; F. M. HASSAN

Iraqi Journal of Aquaculture, Volume 4, Issue 1, Pages 1-16

The epiphytic algae were studied on three aquatic plants (Ceratophyllum demersum, Myriophyllum verticillatum and Potamogeton pectinatus) from seven stations in Euphrates River between Hindia barrage and Al-Kufa city-Iraq, during summer 2004 and spring 2005. A total of (97) species were identified, diatoms were dominant in their species number (73% from the total number), followed by chlorophyta, then cyanophyta and Euglenophyta. Variations were recorded in the species number among the host macrophyte, as well as, among different seasons for each plant. The biomass of epiphytic algae varied among the plant host, diatoms species were dominated and several genera have large number of species as Cymbella, Gomphonema, Nitzschia and Synedra. Most studied stations showed high population density.

ACTIVITY DETERMINATION OF PLANT EXTRACTS IN THE CONTROL OF CYANOBACTERIA

ABDUL- LATEEF M. JAWAD

Iraqi Journal of Aquaculture, Volume 4, Issue 1, Pages 17-24

Some Iraqi plants which belonging to different families were extracted in 80% Ethanol and the ability of these extracts to control and growth of Cyanobacteria was evaluated. Results indicated that Artemisia campestris, Achillia santolina, Artemisia herba-alba and Centurea khotchii extracts were very active in inhibiting the growth of the test Cyanobacterial species. However, other plants extracts in this study did not show any promising algicidal potencies.

EFFECT OF FISH DENSITY AND FEEDING RATES ON GROWTH AND FOOD CONVERSION OF GILTHEAD SEABREAM (SPARUS AURATA LINNAEUS, 1758)

M. M. Taher

Iraqi Journal of Aquaculture, Volume 4, Issue 1, Pages 25-35

The effect of fish density and feeding rates on growth and food conversion of gilthead seabream (Sparus aurata) was studied in floating cages and fiberglass tanks in Sammaliah Island- Abu Dhabi. The results of floating cages experiment showed that there was no significant effects (p>0.) of fish density on growth and food conversion rate but there are significant effects (p<0.05) on fish production (4.11, 7.47 and 10.08) kg/m3 for densities (50,100 and 150) fish/m3 respectively. No significant differences between weight ranges [(27-125), (21-142), (30-126)] g of these fish at the end of experiment, and also between final weights (82.3, 77.4, 67.2) g for densities (50,100,150) fish/m3 respectively. The results of fiberglass tanks experiment showed that there are no significant effects of feeding rate on growth, while there are significant effects on the food conversion rate (1.43, 2.86 and 3.71) for feeding rates (5, 7.5 and 10)% of fish weight respectively. Floating cages give better results from fiberglass tanks (growth rate 0.64 g/day compared with 0.4 g/day, final production 7.31 kg/m3 compared with 4.58 kg/m3 and final weight 75.6 g compared with 45.8 g).

THE USE OF LIVE FOOD IN REARING OF THE LARVAE OF GRASS CARP CTENOPHARYGODON IDELLA

Abdullhussein H. Gazi; Malik H. Ali; Saged S. Al-Noor

Iraqi Journal of Aquaculture, Volume 4, Issue 1, Pages 37-50

The larvae of grass carp Ctenophargodon idella were fed on three types of live food Brachionus calyciflorus, Artemia sp. and Daphnia magna. The study showed that live food is very important to achieve high growth and survival of fish larvae. The average weights of C. idella fed on B. calyciflorus were 118.12+3.0 mg / larvae and 29.48+0.8 mm / larvae respectively, and in case of Artemia sp. The rates were 103.13+1.5 mg/ larvae and 25.34+1.4 mm / larvae, while in the mixed food the rate were 122.80 + 1.8 mg / larvae and 30.08 + 1.1mm /larvae .The survival rate was better on B. calyciflorus treatment as it was 98.6 % ,while it was 98 % and 97% in case of mixed food and Artemia sp. Respectively.

REPLACING OF SOYA BEANS BY DUCK WEED (LEMNA GIBBA) IN THE DIETS OF FRY OF COMMON CARP (CYPRINUS CARPIO)

Jassim H. Saleh

Iraqi Journal of Aquaculture, Volume 4, Issue 1, Pages 51-58

Soya bean was replaced in ratio of 20% and 40% by a dry duck weed in the diet of common carp fry under laboratory conditions. The results showed that the fry which fed on duck weeds gives a final total length of 40.15mm, final wet weight of 1.105 gm and final increase of weight was 0.966gm. The group of larvae which fed on soya bean recorded 37.230 mm, 0.750 gm and 0.618 gm respectively.

SEASONAL VARIATIONS OF THE PHYTOPLANKTON IN ALWND RIVER – IRAQ

ABBAS M. ISMAIL; Fikrat M. Hassan

Iraqi Journal of Aquaculture, Volume 4, Issue 1, Pages 59-69

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.