Eutrophication trend of southeast Caspian Sea water (Mazandaran-Goharbaran) based on Environmental and biotic parameters using single and multiple variables in order to feasibility of Marine Cage Cultur

The aim of this project is to study water quality and the trophic status at different months and depths in the southeast Caspian Sea-Goharbaran based on environmental parameters and nutrients during 2013-2014 in order the feasibility of fish cage culture. Results showed that water temperature, transparency, pH, dissolved oxygen, BOD5, COD, total alkaninity and TSS were varied 9.00-29.00C, 0.50-12.00 m, 8.05-8.74, 5.76-12.85, 14-101, 21-195 and 0.00-0.12 mg/l at the different months and depths, respectively. In addition, The values of NH4+, NH3, NO2-, NO3- and PO4-3 were 0.007-0.051, 0.001-0.010, 0.002-0.015, 0.043-0.477 and 0.014-0.077 mg/l, respectively. Chl-a concentration was recorded as 0.060-8.02 mg/l. Sacled and unscaled trophic indices were equal to 3.42-5.52 and 2.61-5.85, respectively. The proper temperature for cultivation of salmonids species in this area began from October to March. The range of the standard of pH and dissolved oxygen level for fish farming cage were 7.80-8.50 and >5 mg /l that in current study results of pH and dissolved oxygen which were consistent in the current study. Various forms of nitrogen (ammonium, nitrite and nitrate ) at the different layers were acceptable and less than the threshold limit of Australia and New Zealand. The results of the nutrients concentrations compared with data from the reference years (1996-1996 ) in the Caspian Sea (Goharbaran region) showed that this ecosystem passed from oligotrophic status and shifted to mezotrophic and eutrophic condition. As a conclusion, although nutrients concentrations were acceptable in terms of fish farming cages in this region, some parameters such as chemical oxygen demand and transparency are not suitable for aquaculture industry. Meanwhile, based on various trophic levels, this ecosystem (Gohrabaran region) has a mezotrophic status with a high risk of eutrophication.

Bibliographic Details

Main Authors:	Nasrollahzadeh Saravi, Hassan, Vahedi, F., Laloei, F., Ulomi, Y., Nasrollahtabar, A., Makhlough, A., Ebrahimzadeh, M., Razeghiyan, Gh.R.
Format:	Report biblioteca
Language:	Persian
Published:	Iranian Fisheries Science Research Institute 2018
Subjects:	Physico-chemical parameters, Water, Fish cage culture, Temperature, Transparency, pH, Dissolved oxygen,
Online Access:	http://hdl.handle.net/1834/13867
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