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Distribution and abundance of exotic fish species in the rivers of Guilan Province (south-west Caspian Sea)
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Keyvan Abbasi Ranjbar *   , Alinaghi Sarpanah , Mehdi Moradi , Hamed Mousavi-Sabet , Hamid Reza Esmaeili , Ahmad Ghane , Esmaeil Sadeghinejad Masouleh |
| Iranian Fisheries Sciences Research Institute & Agricultural Research, Education and Extension Organization |
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Abstract: (384 Views) |
| There are about 55 permanent rivers in Guilan province, but there is not enough information about the distribution of their fish species. In this article, the data on the presence and abundance of non-native (exotic) fish species related to the fisheries projects of 33 rivers in Guilan during the years 1994 to 2023 were extracted and presented by river. The results showed that there are a total of 22 species of non-native fish in these rivers, and Sefidroud, Pasikhan and Siahdarvishan were the most with 22, 10 and 10 species, respectively. In all three studied areas (West Guilan, East Guilan and Anzali wetland basin), the fishes Carassius gibelio, Pseudorasbora parva and Gambusia holbrooki showed the highest percentage of presence, but the highest relative abundance was related to Chelon saliens, C. gibelio and G. holbrooki. On average, the non-native fishes in the rivers of these three regions constituted about 11.1, 19.8 and 15.0 percent of the number of fish, respectively. It seems that the most damage caused by non-native fish on the native species related to C. gibelio, P. parva, Hemiculter leucisculus and G. holbrooki species is due to their presence and abundance in these rivers and the effect of alien species with low abundance and ornamental fish species is insignificant. |
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| Keywords: Fish, Exotic, Ornamental, Rivers, Caspian Sea. |
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Full-Text [PDF 760 kb]
(126 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2024/12/28 | Accepted: 2025/03/30 | Published: 2025/04/27
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