Publication Date:
2021-05-19
Description:
Limnologicalstudyof SabalanrunoffDamfor aquaculturecold water fish was conducted in sixtimesat
fourstationsfrom
JulytoDecember2009.Averageminimumandmaximumparametersmeasuredindifferentstationswere included water
temperature, dissolved Oxygen, total hardness, electrical conductivity, pH, BOD5, COD,TDS, NH4, NO2, NO3,
PO4, TN, TP, SiO2, respectively (10/3 ± 9/5-14 ± 8/7° C), (9 ± 1/2-11/4 ±2/1 mg/liter), (367 ± 19/8-381 ±
17/8mg/liter), (0/95 ± 0/07-1/05 ± 0/07 mz/cm), (8/3 ± 0/1-8/4 ± 0/1), (3 / 3 ± 1/14-3/88 ± 0/71mg/ liter), (15/5 ±
3/1-16/3 ± 3 mg/liter), (0/48 ± 0/04-0/54 ± 0/06mg/ liter), (0/08 ± 0/02-0/13 ± 0/07 mg/liter), (0/004 ± 0/003-
0/05 ± 0/1 mg/ liter), (0/6 ± 0/2-0/64 ± 0/29 mg/ liter), (0/19 ± 0/07-0/22 ± 0/07 mg/ liter), (10/48 ± 0/6-10/98 ±
0/54mg/liter), (0/39 ± 0/11-0/44 ± 0/18 mg/liter), and(9/9 ±0/6-11/1 ± 1/4 mg/liter).
Averageminimumandmaximumof water heavy metalswas included of Cd, Pb, Zn, Fe, Cuand Ni respectively was
measured as ND(No Deliver), ND, ND- 0/242, ND- 1/075, ND- 0/018andND- 0/014inmg/ liter. Alsoamong
the16organochlorinecompoundsmeasuredthehighestamount of was belonged totoxinHexachlorine Benzene (1/5
mg/ liter). The results of theanalysis ofwater quality parametersshowed that parametersexcept ofCOD, TDS,
PO4, TP, Zn, Fe andwater temperature, otherparametersdo not haveany restrictions foraquaculturecold
waterfishin therunoffDam. Based on data results it was noticed that there was temperature restriction up to
November at downstream and station 2 showed less temperature fluctuation and more suitable condition
compared to other stations. BOD5 value was within the allowable range for growing trout, in which station 2
somewhat with lower volatility of value had the most suitable BOD5 condition.In the present study, the amount
of TDS in the study area was somewhat higher than the limitation and since TDS values increased with distance
from the dam, therefore station 2 had somewhat better conditions for fish farming.In addition the amount of EC
in the study area, indicating the inappropriateness of it for various activities in the fisheries.Although none of the
stations in terms of the amount of phosphorus didn't show favorable conditions for rainbow trout fish
propagation, it appears between the researches stations, station 2 had the most favorable terms.The results of this
study (regardless of the unseen), it seems that in August and September; Zn had overestimated value for cold fish
propagation. Recent study showed that among heavy metals, Fe in water, sediments and fish was over limitation
value. Also, Fe value was measured of 1.08 at station 4, which showed over normal value for cold fish
propagation. Therefore, station 2 at downstream seemed to have suitable cold fish propagation due to lower Fe
value. On the based on the recent study, planktonic biological index did not endorse water quality for fish
propagation. In this study, aquatic plant such as Potamogetonpectinatus and Pheragmitiesaustraliswas found at
water of higher and somehow polluted organic matter. Probably, based on the results it was noticed that
downstream water of dam was polluted to organic matter. At the recent study, resisted maroinvertebrates to
organic matter (Chironomidae) was consisted noticeable frequency compared to other sensitive invertebrates to
organic matter (EPT).Statistically, it can be expressed that probably organic pollution resulted to increase of
resistance invertebrates and decreased of sensitive groups. In recent study, EPT/CHIR index was measured 0.6
in station 2 and 1.74 in station 4. This ration was less to many other mountain rivers. As ETP sensitive
invertebrates has higher sensitive to other groups with the regards of environmental condition and pollution,
unpredicted increase of Chironomidae compare to sensitive groups resulted of EPT/CHIR value which showed
environmental stress. In this study, HFBI index was measured as 7.49 at station 2 and 7 in station4. Based on
HFBI index, station 2 was classified as a high organic pollution and station 4 with noticeable organic pollution.
At the recent study, station 2 was catch more fish to station4. For instance, Squaliuscephalus and Alburnoides
bpinctatuswere catch in station 2 and were not found in station 4. As a whole, Biologicalindicators whichwas
includedPlanktonBioindicator, EPT / CHIR. ,HilsenhoffBiologicalIndicator, diversityanddistribution
ofaquaticplantsandfish, showed water situation inrunoffDamrich inorganic matter. Finally, thestudy
areawasapprovedfor fish farmabout 50tons and needs managementarrangementswiththeincreasedproduction rate.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Water quality parameters
;
Heavy metals
;
Toxins
;
Plankton
;
Macrobenthic
;
Fishes
;
BiologicalIndex
;
Limnological aquaculturefishcold water
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
66pp.
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