Publication Date:
2021-05-19
Description:
This 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.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Specific pathogen free
;
SPF
;
Heavy metals
;
Bacterial contamination
;
Fungal contamination
;
Vibrionacea
;
Fusarium
;
Mucor
;
Monitoring
;
Improvement
;
Quality
;
Water
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
178pp.
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