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Research Article: Trophic status index and natural fisheries potential of some Iranian reservoirs
A.R. Mirzajani *, Sh. Abdolmalaki, J. Daghigh Roohi, H. Babaei, A. Abedini, M. Sayad Borani
Inland water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO) , ar_mirzajani@yahoo.com
Abstract:   (801 Views)
The Iran Water Resources Management Company constructs many dams to control surface water that provide a new potential for aquaculture activities. Trophic status index and natural potential for fish production were investigated in nine small dam reservoirs from northwest of Iran. Prediction of fish productivity was calculated based on phytoplankton biomass (using chlorophyll a concentration in water; PChl-a) and benthic macro invertebrate biomass (PBMI). Average PChl-a and PBMI of reservoirs were estimated as 233.9±479.4 kg ha-1yr-1 and 14.76±19.18 kg ha-1yr-1 respectively. Concentrations of total phosphorus and total nitrogen varied between 0.023-0.345 and 0.42-3.58 mgl-1, respectively. According to Carlsonchr('39')s transformed model (TSIPN) the mesotrophic status was dominant in reservoirs in which TSIPN varied between 38.7 and 51.2. The eutrophication trend seems to be very fast in these reservoirs because of high nutrient input by aquacultures activities. The usage of fertilizers and amounts of food for aquaculture proposes and expansions of exotic species decline the natural fisheries potential of these reservoirs. Maintenance of water quality and investigation of native species should be planned to preserve sustainable fisheries activities in these reservoirs.
Keywords: Natural potential, Trophic status index, Reservoirs, Iran
Full-Text [PDF 441 kb]   (357 Downloads)    
Type of Study: Orginal research papers | Subject: Ecology
Received: 2019/08/25 | Accepted: 2020/04/6 | Published: 2020/11/20
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Mirzajani A, Abdolmalaki S, Daghigh Roohi J, Babaei H, Abedini A, Sayad Borani M. Research Article: Trophic status index and natural fisheries potential of some Iranian reservoirs. IJFS. 2020; 19 (6) :2753-2769
URL: http://jifro.ir/article-1-4031-en.html

Volume 19, Issue 6 (2020) Back to browse issues page
Iranian Journal of Fisheries Sciences Iranian Journal of Fisheries Sciences
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