Iraqi Journal of Aquaculture

The study included the nitrates, phosphates loads and some properties of water quality in the Shatt Al-Arab River at Basra city center . There were used to identifying the state of water and nutrient movement in this part of the River starting from the Shilha location north of Al-Hartha to Al-Bahadriyah north of Abu Al-Khasib, which represents the section that contains dense human population at Basra city center. Fourteen sampling stations were selected within the study area during the summer and winter periods, as well as during the morning and evening at the same day.
The study showed that the phosphate and nitrate salts have not transfer out of this river section. Also there were no significant impact of the side river branches on the water quality of the Shatt al-Arab River because of the low discharges from these branches compared to discharge of the main Shatt al-Arab River.

Common carp, Cyprinus carpio (L., 1758), fry were used with 0.19 g average weight to estimate the effects of magnetized treated water on fish growth and survival , The experiment was carried out with two treatment and control, 500 fish fi h were randomly distributed at 100 fry fish per replicate per( T1 )and( T2 ) and one replicate for control. Magnetized treated water was used for a period of 24 hours with a magnetized intensity of 1000 gauss in the first treatment, and 1500 gauss in the second treatment. The experiment continued from April to end of June2016. The temperature of the water during the experiment period was ranged 25.9- 27.8 ° C, and oxygen level ranged between (4.8 – 7.1) mg / L. magnetization system was operating 24 hours a day. YSI some environmental factors such as water salinity, pH and water temperature were measured using YSI. Fish were fed twice a day, with 10% of the total weight of fish, with a total protein content of 37%. The gain weight obtained after eight weeks was 1.27±0.049g in (T2), 1.13±0.021g in (T1), while the highest weight in the control treatment reached 0.92±0.007g. The mean of gain weight in the reared fish in (T1) for eight weeks feeding period was 1.10 ± 0.77 g. and in the treatment of 1000 gauss was 0.96 ± 0.67 g, while the mean of gain weight in the control treatment was 0.96 ± 0.53 g. common carp survival rate reared in magnetic water varied under the influence of different magnetic intensities within eight weeks. It was found that the highest survival rate was under the influence of the magnetic intensity of 1500 gauss which was 93%, and the percentage of surviving under magnetic intensity 1000 gauss was 82%, while in the control treatment, it was 45%.

The current study was conducted to calculate the annual Occurrence, monthly density and relative abundance of the Metapenaeus affinis. The samples were collected monthly for the period from October 2017 to September 2018. Some environmental factors such as temperature of water and air, pH, salinity, dissolved oxygen and turbidity were measured. We obtained 7 types of shrimp belonging to three families in the Al-Burka station and the Al Sabbaghia Station , which are 7 species, all of which belong to the Division of arthropods and crustaceans, the first family: Penaeidae is a banyan family that includes Metapeneaus affinis, Penaeus semisulcatus, Family: Atyidae, include Caridina babaulti basrensis , Atyaephyra desmaresti mesopotamica and Family: Palamonidae includes Exopalaemon styliferus, Palaemon elegans and Macrobrachium nipponense divided into four categories according to the Yearly Occurrence Resident, Fluctuated, Occasional, Rare .
The monthly density of each species of shrimp was calculated and the range was: for Metapenaeus affinis 0-325.85 Ind./ m² and Penaeus semisulacatus 0-5.32 Ind./ m² and Caridina babaulti basrensis 0-111.72 Ind./ m² Atyaephyra desmaresti mesopotamica 0-679.63 Ind./ m² Exopalaemon styliferus 0-23.94 Ind./ m² Palaemon elegans 0-19.95 Ind./m² Macrobrachium nipponense 0-55.86 Ind./ m² .
The highest density in the Al-Burka station for Metapeneaus affinis to 2600.15 Ind./ m² The Lowest density for Penaeus semisulacatus to 9.31 Ind./ m² and the highest density in the Al Sabbaghia Station for cardinia babaulti basrensis to 320.53 Ind./ m² and the lowest density for Exopalaemon styliferu at 3.99 Ind./ m² and The total density of the Al-Burka station in the east Al-Hammar Marsh was higher than the. Al Sabbaghia Station In Chabaish Marsh .
The monthly abundance of shrimp was calculated as Metapenaeus affinis 0-100%, Penaeus semisulacatus 0-1.87 %, Caridina babaulti basrensis 0-93.33 %, Atyaephyra desmaresti mesopotamica 0-100 %, Exopalaemon styliferus 0-27.27% ,Palaemon elegans 0- 26.66 % , Macrobrachium nipponense 0-73.33 %.
The results of the statistical analysis showed a positive relationship between abundance and water temperature, pH and salinity and showed significant differences between abundance and acuityP< 0.007 between sovereignty and mean P< 0.018 The correlation coefficient was positive between abundance and (temperature water, pH , Salinity and acacia) and the correlation coefficient between abundance and dissolved oxygen.

During this study, 95 disease cases were recorded, 40 of
them were due to the bacterial gill disease, 29 due to the
skin ulcer disease, 14 due to the intestine inflammatory
disease and nine cases of Asian tapeworm Schyzocotyle
acheilognathi, one case each of acidity disease, high
ammonia disease and fin rot. Health problems were
recorded in 71 fish farms for the three years in an
epidemiological or mass infections which included 46
pond farms with a total area of 310 dunam (0.25 ha) and
15 fish farms with a total of 139 cages and a total area of
1733.2 m
2
. Infected farms that adopt closed and semi-
closed systems were 10 farms with a total area of 1233.2
m
2
. Death rates were different. The highest incidence of
disease (52 cases) was recorded in 2016. Cases were
described, the causes of the diseases and the results were
recorded based on the chronological sequence of each
case, type of infection and method of fish farming.