ﺑﺮرﺳﯽ ﻓﺮاواﻧﯽ ، ﭘﺮاﮐﻨﺶ ﻣﺎﻫﯽ ﺑﻮﺗﮏ ( Cyprinio macrostomum) در رودﺧﺎﻧﻪ ﮐﺸﮑﺎن ﻟﺮﺳﺘﺎن

The survey of frequency and distribution of Cyprinion macrostomum in the Kashkan River - Lorestan

ﺑﺮرﺳﯽ ﻣﺎﻫﯿﺎن رودﺧﺎﻧﻪ ﮐﺸﮑﺎن ﺑﺎ ﻃﻮل ﻣﺴﯿﺮ آﺑﯽ 160 ﮐﯿﻠﻮﻣﺘﺮ ﺑﺎ اﻧﺘﺨﺎب 6 اﯾﺴﺘﮕﺎه از ﺷﻤﺎل ﺑﻪ ﺳﻤﺖ ﺟﻨﻮب اﺳﺘﺎن اﺟﺮاءﺷﺪ. ﻧﻤﻮﻧﻪ ﺑﺮداري ﺑﻪ ﺻﻮرت ﻓﺼﻠﯽ ﺑﺎ اﺳﺘﻔﺎده از اﻟﮑﺘﺮوﺷﻮﮐﺮ، ﺗﻮرﭘﺮﺗﺎﺑﯽ و ﺗﻮر ﮔﻮﺷﮕﯿﺮ اﻧﺠﺎم ﮔﺮدﯾﺪ. ﻣﺎﻫﯿﺎن ﺷﻨﺎﺳﺎﯾﯽ ﺷﺪه از ﺑﯿﻦ 4207 ﻗﻄﻌﻪ در ﻃﯽ ﯾﮏ دوره دو ﺳﺎﻟﻪ ﻣﺘﻌﻠﻖ ﺑﻪ 18ﮔﻮﻧﻪ ﺑﻮدﻧﺪ. ﻣﺎﻫﯽ ﺑﻮﺗﮏ دﻫﺎن ﺑﺰرگ (Cyprinion macrostomum) ﯾﮑﯽ از ﮔﻮﻧﻪ ﺑﻮﻣﯽ و اﻗﺘﺼﺎدي ﺑﺎ 1308 ﻗﻄﻌﻪ ﺑﻌﺪ از ﮔﻮﻧﻪ Capoeta trutta ﺑﺎ 1485ﻗﻄﻌﻪ، داراي ﺑﯿﺸﺘﺮﯾﻦ ﻓﺮاواﻧﯽ را در اﯾﻦ رودﺧﺎﻧﻪ ﺑﻪ ﺧﻮد اﺧﺘﺼﺎص داده اﺳﺖ. ﺑﯿﺸﺘﺮﯾﻦ ﻓﺮاواﻧﯽ اﯾﻦ ﮔﻮﻧﻪ در اﯾﺴﺘﮕﺎه ﭼﻬﺎرم ﺑﺎ 445 ﻗﻄﻌﻪ ،ﮐﻤﺘﺮﯾﻦ ﻣﯿﺎﻧﮕﯿﻦ وزن ﺑﺎ 42 ﮔﺮم در اﯾﺴﺘﮕﺎه 6 و ﺑﯿﺸﻨﻪ وزن ﺑﺎ 225 ﮔﺮم در اﯾﺴﺘﮕﺎه 4 ﺑﺪﺳﺖ آﻣﺪ. ﺳﻦ ﻣﺎﻫﯿﺎن ﺑﯿﻦ 1 اﻟﯽ 5 ﺳﺎل و ﮐﻤﺘﺮﯾﻦ ﻓﺮاواﻧﯽ ﻣﺮﺑﻮط ﺑﻪ ﺳﻦ 5 ﺑﺎ ﯾﮏ ﻗﻄﻌﻪ در اﯾﺴﺘﮕﺎه 2 و ﺑﯿﺸﺘﺮﯾﻦ ﻓﺮاواﻧﯽ ﻣﺮﺑﻮط ﺑﻪ ﺳﻨﯿﻦ 3 ﺑﺎ 24 ﻗﻄﻌﻪ در اﯾﺴﺘﮕﺎه 3 ﺑﺪﺳﺖ آﻣﺪ. از ﺑﯿﻦ 103 ﻗﻄﻌﻪ ﻣﺎﻫﯽ ﺗﻌﯿﯿﻦ ﺟﻨﺴﯿﺖ ﺷﺪه ﻧﺮﻫﺎ ﺑﺎ ﻣﯿﺎﻧﮕﯿﻦ وزﻧﯽ 61 ﮔﺮم ﺑﻪ ﺗﻌﺪاد 40 ﻗﻄﻌﻪ و ﻣﺎده ﻫﺎ ﺑﻪ ﺗﻌﺪاد 63 ﻗﻄﻌﻪ ﺑﺎ ﻣﯿﺎﻧﮕﯿﻦ وزﻧﯽ 75 ﮔﺮم ﺑﺪﺳﺖ آﻣﺪ.

Assessment of Kashkan river fish was done around the 160 km of the river. Sampling stations were selected from North to South by using of Electroshocker, cast net and Gill net, seasonal. 18 species were investigated between 4207 individuals during two years. Cyprinion macrostomum is one of the native and economical species with 1308 pieces after Capoeta trutta with 1485 pieces, which has the highest frequency in this river. The highest frequency of this species was obtained at station 4 with 445 pieces, the lowest average weight was 42 g at station 6 and the maximum weight was 225 g at station 4. The age of the fish was between 1-5 years and the lowest frequency was 5 years old with one piece at station 2 and the highest frequency was related to age 3 with 24 pieces at station 3. Of the 103 fish species identified, males with an average weight of 61 g were divided into 40 pieces and 63 females with an average weight of 75 g.