Iranian Journal of Fisheries Sciences
مجله علوم شیلاتی ایران
IJFS
Agriculture
http://jifro.ir
1
admin
1562-2916
10.18869/acadpub.ijfs
en
jalali
1399
8
1
gregorian
2020
11
1
19
6
online
1
fulltext
en
Research Article: Trophic status index and natural fisheries potential of some Iranian reservoirs
Ecology
Ecology
پژوهشي
Orginal research papers
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 <em>a</em> concentration in water; P<sub>Chl-<em>a</em></sub>) and benthic macro invertebrate biomass (P<sub>BMI</sub>). Average P<sub>Chl-<em>a</em></sub> and P<sub>BMI</sub> of reservoirs were estimated as 233.9±479.4 kg ha<sup>-1</sup>yr<sup>-1</sup> and 14.76±19.18 kg ha<sup>-1</sup>yr<sup>-1</sup> respectively. Concentrations of total phosphorus and total nitrogen varied between 0.023-0.345 and 0.42-3.58 mgl<sup>-1</sup>, respectively. According to Carlson's transformed model (TSI<sub>PN</sub>) the mesotrophic status was dominant in reservoirs in which TSI<sub>PN</sub> 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.
Natural potential, Trophic status index, Reservoirs, Iran
2753
2769
http://jifro.ir/browse.php?a_code=A-10-3218-1&slc_lang=en&sid=1
A.R.
Mirzajani
ar_mirzajani@yahoo.com
100319475328460038272
100319475328460038272
Yes
Inland water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO)
Sh.
Abdolmalaki
abdolmalaki2014@gmail.com
100319475328460038273
100319475328460038273
No
Inland water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO)
J.
Daghigh Roohi
javad_daghigh@yahoo.com
100319475328460038274
100319475328460038274
No
Inland water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO)
H.
Babaei
babaeiha@yahoo.com
100319475328460038275
100319475328460038275
No
Inland water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO)
A.
Abedini
aabedinim@yahoo.com
100319475328460038276
100319475328460038276
No
Inland water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO)
M.
Sayad Borani
mahmoudsayyadbourani@yahoo.com
100319475328460038277
100319475328460038277
No
Inland water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO)