بررسي استحكام تورهاي پرة به كار گرفته شده در استان هاي گلستان و مازندران

Study of strength length of Beach Seine nets in Mazandaran and Golestan provinces

ﻫﺮ ﺗﻮر ﺻﯿﺎدي ﺑﺮاي ﺻﯿﺪ ﻣﺎﻫﯽ ﺧﺎﺻﯽ ﻃﺮاﺣﯽ و ﺳﺎﺧﺘﻪ ﻣﯽﮔﺮدد. ﻣﻄﺎﺑﻖ ﻧﻮع و اﻧﺪازة رﺷﺘﻪﻫﺎي ﻧﺦ ﺗﺸﮑﯿﻞدﻫﻨﺪة ﺗﻮر، اﺳﺘﺤﮑﺎم آنﻫﺎ ﺑﺎ ﯾﮑﺪﯾﮕﺮ ﺗﻔﺎوت دارﻧﺪ. ﺣﻔﻆ اﯾﻦ اﺳﺘﺤﮑﺎم ﺑﺮاي ﺻﯿﺪ ﻣﺎﻫﯽ از اﻫﻤﯿﺖ ﺧﺎﺻﯽ ﺑﺮﺧﻮردار اﺳﺖ. ﻣﺘﺄﺳﻔﺎﻧﻪ در اﯾﺮان اﺳﺘﺎﻧﺪارد ﺧﺎﺻﯽ ﺑﺮاي ادوات ﺻﯿﺎدي وﺟﻮد ﻧﺪارد. ازاﯾﻦرو در ﺗﺤﻘﯿﻘﯽ ﺗﺼﻤﯿﻢ ﮔﺮﻓﺘﻪ ﺷﺪ ﺗﺎ اﯾﻦ ﻣﻮﺿﻮع در راﺑﻄﻪ ﺑﺎ ﺻﯿﺪ ﭘﺮه ﻣﻮردﺗﻮﺟﻪ ﻗﺮار ﮔﯿﺮد. ﺑﺮاي اﯾﻦ ﻣﻨﻈﻮر در ﻓﺼﻞ ﺻﯿﺪ ﭘﺮه و در ﺧﻠﺎل ﺳﺎلﻫﺎي 1392 و 1393 از دو ﺗﻌﺎوﻧﯽ ﺻﯿﺎدي ﺗﻌﺪاد 20 ﻧﻤﻮﻧﻪ ﻧﺦ از ﺑﺨﺶﻫﺎي ﮐﯿﺴﻪ و ﺟﻨﺎﺣﯿﻦ ﺗﻮر ﭘﺮه ﺗﻬﯿﻪ ﺷﺪ. ﺟﻬﺖ ﺑﺮرﺳﯽ اﺳﺘﺤﮑﺎم، ﻧﺦﻫﺎ ﺑﻪ آزﻣﺎﯾﺸﮕﺎه داﻧﺸﮕﺎه ﺻﻨﻌﺘﯽ اﻣﯿﺮﮐﺒﯿﺮ اﻧﺘﻘﺎل داده ﺷﺪﻧﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﻣﯿﺎﻧﮕﯿﻦ اﺳﺘﺤﮑﺎم ﺗﻮر ﻧﻮ و ﺗﻮر ﮐﺎرﮐﺮده در ﺑﺨﺶ ﮐﯿﺴﻪ و ﺟﻨﺎﺣﯿﻦ داراي ﺑﯿﺸﺘﺮﯾﻦ اﺳﺘﺤﮑﺎم ﺑﻮدهاﻧﺪ. ﺑﻪﻃﻮريﮐﻪ اﺳﺘﺤﮑﺎم ﺗﻮر ﻧﻮ در ﺑﺨﺶ ﮐﯿﺴﻪ 318 و ﺗﻮر ﮐﺎرﮐﺮده 295 ﮐﯿﻠﻮﮔﺮم ﻧﯿﺮو، ﺗﻮر ﻧﻮ ﺟﻨﺎﺣﯿﻦ 309 و ﺗﻮر ﮐﺎرﮐﺮده 301 ﮐﯿﻠﻮﮔﺮم ﻧﯿﺮو ﺑﻮد. ﻧﺘﺎﯾﺞ ﻫﻤﭽﻨﯿﻦ ﻧﺸﺎن داد ﮐﻪ اﺧﺘﻠﺎف ﻣﻌﻨﯽداري ﺑﯿﻦ آنﻫﺎ وﺟﻮد دارد )0/01

Fishing nets are designed and manufactured for catching a target fish. Accordingly, the type and size of the netting yarns, strength length of the fishing nets are different. Keeping this strength is important for catching fish. Unfortunately, there is no specific standard for fishing gear in Iran. Therefore, a research was done to investigate strength of Caspian Sea beach seine. For this purpose, 20 samples were collected from net bag and wings of two fishing cooperative in the harvest season of 2014 and 2015. The samples was sent to Amirkabir University of Technology laboratory for study the strength length. The results show that the average of strength of both treatments (new net and used net) in both parts were the highest values. So that, the strength of new net in cod end was 318 kg/f, used net in cod end 295 kg/f, new net in wings 309 kg/f and used net in wings 301 kg/f. The results of one-way ANOVA test show that there was a significant difference among them (P <0.001). In addition, one-way analysis of variance show that there is a significant difference among the mean twist rates in the studied treatments (P <0.001). Studies showed that over time, the strength of this net has reduced, and this decrease was higher in the cod end.