Publication Date:
2021-05-19
Description:
In recent years, protected areas have got a lot of attention in fisheries management as a tool for providing an
ecological vision. This study was done for identification of sensitive and valuable fishery areas and areas under
environmental stress in Mahshar creeks from September 2009 to August 2010. At first level biological
parameters including phytoplankton, zooplanktons, macrozooplanktons, benthic organisms, trawl catch aquatic
organisms along with physical, chemical and heavy metal in substrate were studied. Samplings were done
monthly and seasonally from 8 creeks in Mahshahr region in northwest of the Persian Gulf.
In order to determine the level of contamination of heavy metals, normal values (Background value) of various
metals in the study area were determined using the average of the previous plus one standard deviation
determined factor contamination of metal (Cf) and a total degree of pollution of the estuary ( Cd) based on heavy
metals . The amounts of various metals pollution factor (Cf), the following:
Hg 〉 Zn 〉 Cu ≥ Ni 〉 Pb ≥ Co 〉 Cd
Based on the degree of contamination (Cd), different creek are the form below:
Bihad 〈Patil 〈 Ghazaleh 〈 Darvish ≤ Doragh 〈 Zangi ≤ Ahmadi〈 Ghanam
Other metals were lower than above standard based on the degree of risk of contamination for aquatic organisms.
Also, the degree of toxicity of heavy metals (St), biological production index (Bioproduction Index) in substrate
and risk factors (Risk Index) is determined for different creeks. The latest index shows that some metals, such as
mercury, zinc, and nickel were at risk level and all creeks in the study had average levels of pollution and
Ghanam showed significant pollution of heavy metals.
Creeks in the study have muddy substrate. Identified macrobenthos classified based on their susceptibility to
stress and environmental pollutants into five ecological groups.
Based on annual average of AMBI, all creeks were in ecological group 3 (slightly polluted) except Darvish. In
general based on AMBI and BI in different seasons and creeks, 34% of creeks were unpolluted, 34% were
slightly polluted and Patil, Zangi, Doragh and Bihad were severely polluted in winter.
The detection of bio value and bio sensitivity of Mahshahr costal habitats and also severity of risks and threats
expressed by means of measures taken. Positive criteria (potential habitat) and negative (threat factors and
indices) in the three Grade 1, 3 and 5 respectively, in the three levels of low, moderate and well classified.
Finally, the highest score indicates the most appropriate place to protect the estuaries in the study.
The detection sensitivity of the values of biodiversity and habitats of coastal waters Mahshahr and severity of
risks and threats expressed by means of measures taken. Positive criteria (potential habitat) and negative (threat
factors and indices) in the three Grade 1 ، 3 and 5, respectively, in the three levels of low, moderate and well
classified. Finally, the highest score indicates the most appropriate place to protect the estuaries in the study.
Darvish, Ghnam and Douragh creeks are most suitable creeks, and Ghanam, are known to protect the weak. And
Khvrhayy as severe and ladle on average, and second choice for their protection. Study the possibility of
establishing protected areas and enforce protective laws, the level and extent of protection and the scope of
protection requires more comprehensive studies in the future.
In the second stage of maturation for the reproduction of natural and semi-natural waters and fishing Bandar
Imam (hormone injection) has been reproduced. The reproduction of the species Sparidentex hasta and
Acantuphagrus laus and grouper in the number of 225,000, 700,000 and 300,000 pieces about 5.2 cm to rebuild
fish stocks of the species in the dining area were released .
Survival rate of above species at the time of release related collected larvae in one day were highest in
Acantuphagrus laus (48.4%). And then Sparidentex hasta (25%) and the lowest survival was in grouper (about
11/72%).
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Mahshahr creeks
;
Protected Areas
;
Heavy metal pollution
;
By catch
;
Spatial diversity
;
Frequency
;
Distribution
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
79pp.
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