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Volume 33, Issue 6 (2-2025) |
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Effect of some climate change parameters on the development of rainbow trout farming capacity in the Bashar River basin (Kohgiluyeh and Boyerahmad Province)
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Abulhassan Rastiannasab1   , Mahmood Bahmani2 , Seyed abdolhamid Hosseini1 , Mohammad meysam Salahi ardakani1 , Esmaeil Kazemi1 |
1- Iranian Fisheries Science Research Institute (IFSRI), Shahid Motahary Coldwater Fishes Genetic and breeding Research Center-Yasoj, Agricultural Research Education and Extension(AREEO), Yasoj, Iran
2- Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension(AREEO), Tehran, Iran |
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Abstract: (265 Views) |
Introduction
Kohgiluyeh and Boyerahmad province ranked third in the country in 2023 with a production of 23,000 tons of rainbow trout (Qurbanzadeh and Sedghpour, 2023). The majority of this production takes placed in the Beshar river basin as one of the main branches of the Karun river (Rastiannasab et al., 2023). Climate change has been recognized as a major environmental crisis and concerned by the World Meteorological Organization (Kalbali et al., 2021). Climate change leads to changes in the amounts and patterns of precipitation and temperature at the basin (Sarkar and Chicholikar, 2017). In Iran, precipitation is one of the basic variables for evaluating the potentially available water resources, but its temporal and spatial distribution is very heterogeneous, therefore the distribution of water resources in the country is not uniform (Hassan et al., 2014). For this reason, temporal variability of precipitation has great importance in assessing the available water resources of watersheds and studying the relative availability of water resources at local and regional scales (Sha et al., 2019). Despite the few studies conducted to investigate the most important phenomena affected by climate change and impressive on water resources in Kohgiluyeh and Boyerahmad province, many applicants insist on issuing permits to build new farms. In this study, it is attempted to examine data of the most important meteorological stations in the watershed and the flow statistics of the Beshar river over a long period to compare the obtained results with the findings of software studies conducted to providing evidence of climate change in the watershed, to explain the impact of the weather changes on aquaculture activities, the production of freshwater fish in this area and the sustainability of this industry in the future.
Methodology
Average temperature and rainfall data were collected based on the average air temperature and rainfall from the Yasouj Synoptic Meteorological Station in the center of the studied basin in different months of the year and annual average over a 35-year period ended 2023, the flow statistics of the Beshar river over a long period to compare the mentioned statistics with the average of them in the last ten years were used, Data on air temperature, precipitation, and river flow in the last 10 years were calculated and reported as monthly averages and standard deviations over a long period. Data analysis was performed using independent samples t-test using SPSS version 24 statistical software package in case of homogeneity of variance, and non-parametric Mann-Whitney U test was used in case of non-normality of data.
Results
The findings indicated an increase in the average annual temperature and a decrease in annual rainfall (18%) in the long term in the basin (Fig. 1) so that the average rainfall in the first ten years of the period was (892±287 mm) and the last eight years (728±275 mm) which had no significant difference (P<0.05). The decrease of the average discharge of the river in the last ten years compared to the previous 40 years was 30% (P<0.05).
Figure 1: The location of the Beshar river flow monitoring stations, the river's catchment area regarding to the Persian Gulf watershed
The results of the data analysis indicated a significant decrease in precipitation in the winter season compared to previous years (P<0.05), so that most of the decrease in precipitation in the last ten years is observed in the winter season (Fig. 2).
Figure 2: Ten- year average annual air temperature of Yasouj meteorological station in the basin of Beshar River
The Qalat station (station1) is located at the beginning of the watershed, within the village of Qalat, in the upper part of the river. Based on the data analysis, the average river discharge at the Qalat station has decreased by nearly 25 percent in the last ten years compared to the long term period (P<0.05). Patavah station (station 4) is considered the last hydrometric station of the Bashar river basin and receives water from all branches and after a distance in the Darb Qalat area, the River basin is ended. The decrease in the average flow in the last ten years compared to the previous 40 years in Patavah station was 35 percent (P<0.05).The river discharge in summer was lower than the other seasons.
Discussion and conclusion
According to the results, the decrease in flow of Beshar river is due to the decrease in rainfall in recent years compared to the long-term period, by 25 to 35 percent in the upstream and downstream river areas, respectively. Therefore, it is expected that the decrease in winter precipitation in the form of snow and rain in recent years has caused the decrease in the flow of river lately. The findings of the software studies showed that during this century, it will be an increase in temperature and a decrease in precipitation, and the decrease in precipitation in the second half of the century is more than the first half (Panahi et al., 2022). In addition to reducing the flow, the occurrence of floods and water turbidity resulted of climate change (Chun et al., 2013) have directly caused damage to the farms using the river water (Rastiannasab, 1998) and effective in 3 times loss of more than a thousand tons of fish in the last 4 years. It is necessary to build a drainage system on the river bank to supply water as technical and safety facilities against floods in onset of rainbow trout fish farms construction. Apart of increasing the production per unit area by using the mechanization, filtration and reuse of drained out water in the active farms, we can be hoped for the development of aquaculture in the main flow of the Bashar River in downstream, from the Durohan area (near station 4) to the end of the catchment area in the province via issue new licenses gradually over 5 to 10 years and review the feedback of the initial licenses issued.
Conflict of Interest
We wish to confirm that there are no known conflicts of interest associated with this study.
Acknowledgements
This article is a part of the final report of the research project approved by the Iranian Fisheries Science Research Institute (IFSRI) from the fund of Kohgiluyeh and Boyerahmad Agriculture- Jahad Organization. We wish to express our thanks to Dr. Motamedi as the its chairman.
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| Keywords: Beshar river, Climate change, Aquaculture development, Fish farming, Rainbow trout |
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Full-Text [PDF 869 kb]
(68 Downloads)
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Type of Study: Research |
Subject:
ليمونولوژي
Received: 2023/12/23 | Accepted: 2025/02/28 | Published: 2025/03/17
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Rastiannasab A, Bahmani M, hosseini S A, salahi ardakani M M, kazemi E. Effect of some climate change parameters on the development of rainbow trout farming capacity in the Bashar River basin (Kohgiluyeh and Boyerahmad Province). isfj 2025; 33 (6) :1-13 URL: http://isfj.ir/article-1-2778-en.html
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