Mesopotamian Journal of Marine Science

Seasonal variation of the quality and quantity of zooplankton was studied in four selected stations of Southern Al-Hammar Marshes, from October 2018 to July 2019. Plankton net (0.1 mm. mesh size) was used to collect the samples of zooplankton. The population density of zooplankton in the study area ranged from 725 ind./m3 in Summer 2019 at station 1 (Al-Barga station) to 151413 ind./m3 in Autumn 2018 at station 3 (Hareer station), with an average of 39336 ind./m3. The Crustacea was the dominant group; it was accounted for (96.3%) of the total zooplankton, Copepoda constituted about (80.3%) followed by Cirripede larvae (13%), Rotifera (3.3%), and Cladocera (2.4%) of the total zooplankton. The Cyclopoida was the dominant group of Copepoda at all stations (95.6%), followed by the nauplii of Copepoda (2.8 %), Calanoida (1.3 %) and Harpacticoida (0.3 %).

In the current study, one isolation was obtained from the Cyanophyta Oscillatoria princeps which was collected from pond water located in Khor Al-Zubair/Basrah during August 2018. The current study aims at extracting and purifying of some effective pigments from the above isolate, test them chemically. Allophycocyanin (APC) pigments were highest among other pigments in sample removal-oil compared to the quantities of concentrations of phycoerythrin (PE) and phycocyanin (PC) pigments. The stationary phase in the industrial media have produced the largest amount of pigments. Phycobiliproteins were observed through the UV-Visible peaks. Freeze-dried samples or removal-oil showed that phycobiliproteins aren't affected by increasing or decreasing the sonication period. The study showed that it’s possible to use different media for pigments extraction as buffers and acetate buffer has been mastered. The freezing-thawing method is the best compared with other methods, the concentration of phycoerythrin (PE) pigments began to increase gradually from 6-12 days at PC and PE pigments extract, respectively. According to the statistical analysis, there are significance differences in Phycoerythrin. pigments concentration from 9th day to the 12th day.

An investigation was carried out to overview the status of the inland fishery resources in Dhi Qar Province during the period from 2017 to 2020. The whole fish landed from five marshes throughout the study period was about 30833 tons using seine net, gill net, cast net and electro-fishing gears. The highest annual quantity landed was about 8502 tons in 2020 which formed about 27.6 % of total fish landed. In fact, this variation in fish stock from year to year could be related to overfishing, weather changes, pollution levels, water levels, market prices and environmental conditions (natural or human-made). This study also indicated that the majority of fish landed came from capture fisheries and the rest from fish farming. Eleven fish species were observed and Cyprinus carpio was dominant with 37 % of the total weight landed followed by Planiliza abu which comprised about 25% of the total. Six native species, two alien species and two migratory species were also found throughout this investigation which composed about 41.3 %, 56.5 % and 2.2 % of the total, respectively.