Improvement and monitoring of health, pollutanys and quality of water
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AbstractThis study was a part of the national big plan of "Attain to technical knowledge of specific pathogen free shrimp production and cut off to dependence on foreign products . "Shrimp aquaculture as one of the most important activities in the world and Iran is expanding. Bacteria and fungi of the most common infectious agents causing diseases are in the hatchery and shrimp. The most important bacteria causing diseases in the hatcheries and shrimp Farms, bacteria are Vibrionaceae family. The fungi can be identified as Fusarium, Mucor, Cladosporium, Aspergillus, Penicillium and yeast. Utilized of water supply system in this project for breeding and reproduction of shrimp is a controlled system. This system acts as a part of biological security. Incoming water before the utilization was monitored for the total bacteria count, fungi and as well as Vibrionaceae family, each 15 days. If contamination is too predictable, additional tests and necessary treatments were carried out to improve the quality of the water. The water, after use in the system and after passing through the filtration system, was guided out. The frequencies of water and sediment sampling were once per month. The water samples for analysis of heavy metals and PAHs were fixed by HNO3 and H2SO4 (pH<2), respectively. Heavy metals (Cu, Zn, Cd, Pb, Hg, As) in water samples were analyzed by Polarograph (Metrohm-797). PAHs in water and sediment were extracted by an extractor funnel and microwave digestion method, respectively. Then, these compounds were defined by GC- MS. The quantities of heavy metals in water samples were low. In the water sample inlet station (in sea) and aquaculture center of SPF shrimp, concentrations of metals were significantly different (p<0.05). Significant correlations were not seen between levels of heavy metals in water samples (sea and aquaculture center of SPF shrimp) and sampling time (p>0.05). There were 17 compounds of PAHs detected in the samples. The samples were calculated using (low molecular/high molecular) PAHs ratio (LMW/HMW) to determine the sources of PAHs. The value of less than 1 is the pyrolytic sources and more than 1, consist of petrogenic sources. In this research LMW/HMW ratio was less than one. On the other hand PAHs of sediments had pyrolytic sources.
Publisher or UniversityIranian Fisheries Science Research Institute
Series : Nr50671;