Document Type : Research Paper
Authors
1
1. Ph.D.Fisheries department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2
2. Associate Professor,Fisheries department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3
Assistant Professor ,Persian Gulf & Oman Sea Ecological Research Institute, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extention Organization, Iran
4
Associate Professor, Agricultural Meteorology department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Abstract
Significance of climate change trend in the period of 22 years and the effect of climatic variables on CPUE of pelagic fishes (sardines and anchovies) in three areas: Jask port, Lenge port and Qeshm were studied. Three categories of data including fishing, satellite and meteorological data were processed and analyzed over a period of 22 years (1997 to 2019). Satellite data related to water areas were used to obtain information on sea surface temperature (SST), sea surface chlorophyll (SSC) and photosynthetic active radiation (PAR) variables. Information about meteorological data including wind speed, rainfall and minimum and maximum temperatures were received at 3 offshore and coastal stations. CPUE values were significantly different in the three study areas. The most significant changes were observed for the mean maximum temperature and minimum temperature of the months. So that in each of Jask and Lenge regions in 6 months of the year and in Qeshm region in 9 months of the year, the trend of maximum temperature changes in the desired time period has increased significantly. During the period, the average monthly minimum temperature of 3 months of the year in Jask region, 6 months of the year in Lenge region and 10 months of the year in Qeshm region has increased significantly. The fishes of Qeshm and Lenge regions showed high overlap with each other, while the fish of Jask region showed a more distinct difference than the other two regions in the PCA diagram. The relationship between CPUE changes and environmental parameters was almost the same for both species. In all models, chlorophyll A and rainfall were the most significant and important variables affecting.
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