FISH ASSEMBLAGE STRUCTURE IN AL-DIWANIYA RIVER, MIDDLE OF IRAQ
Journal Title: ASIAN JOURNAL OF NATURAL & APPLIED SCIENCES - Year 2017, Vol 6, Issue 4
Abstract
The fish species structure, occurrence, abundance and ecological indices of fish assemblage in the Al-Diwaniya River, middle of Iraq were studied. Fish were sampled monthly by different fishing gears from November 2016 to October 2017. Water temperature varied from 10.2oC in March to 32.8oC in August, dissolved oxygen values fluctuated from 5.0mg/l in August to 9.6mg/l cm in February, salinity ranged from 0.55‰ in April to 0.79 ‰ in July and pH values varied from 6.6 in August to 8.7 in March. A total 27 fish species belonging to eight families were collected, 19 of them were native and eight exotic species. The most abundant species were Carassius auratus, comprising 14.6% of the total catch, Planiliza abu (14.2%) and Oreochromis aureus (11.4%). The dominance value (D3) was 40.2%. Water temperature showed significantly positive correlation with the number of fish individuals and weak positive correlation with the number of species, while salinity showed weak positive correlations with the number of species and the individuals. The mean annual values of diversity, richness and evenness indices were 2.56, 3.37 and 0.81, respectively. The study shows that the fish assemblage structure in the Al-Diwaniya River was clearly differed from adjacent rivers in middle of Iraq by number of fish species, the dominancy species and the fish diversity.
Authors and Affiliations
Abdul-Razak M. Mohamed, Mohanad O. A. Al-Jubouri
Keywords
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