ﺑﺮرﺳﯽ ﺧﺼﻮﺻﯿﺎت رﯾﺨﺖ ﺷﻨﺎﺳﯽ و ﻏﻠﻈﺖ ﻋﻨﺎﺻﺮ اﺗﻮﻟﯿﺖ درﻣﺎﻫﯽ ﺣﻠﻮا ﺳﯿﺎه

Determination of morphological characteristics and element concentration of otoliths in Black pomfret (Parastromateus niger)

ﻣﻄﺎﻟﻌﻪ ﺣﺎﺿﺮ ﺑﻪ ﻣﻨﻈﻮر ﺗﻌﯿﯿﻦ ﻏﻠﻈﺖ ﻋﻨﺎﺻﺮ اﺳﺘﺮوﻧﺘﯿﻮم ﮐﻠﺴﯿﻢ، ﭘﺘﺎﺳﯿﻢ و ﺳﺪﯾﻢ در ﺑﺮﺷﻬﺎي ﻋﺮﺿﯽ اﺗﻮﻟﯿﺖ و ﻫﻤﭽﻨﯿﻦ ﺑﺮرﺳﯽ و ﻣﻘﺎﯾﺴﻪ ﭘﺎراﻣﺘﺮﻫﺎي رﯾﺨﺖ ﺳﻨﺠﯽ اﺗﻮﻟﯿﺖ در ﮔﻮﻧﻪ ﺣﻠﻮا ﺳﯿﺎه در ﺳﻮاﺣﻞ درﯾـﺎي ﻋﻤـﺎن (اﺳﺘﺎن ﺳﯿﺴﺘﺎن و ﺑﻠﻮﭼﺴﺘﺎن)ﺻﻮرت ﭘﺬﯾﺮﻓﺖ. ﺧﺼﻮﺻﯿﺎت زﯾﺴﺖ ﺳﻨﺠﯽ ﻣﺎﻫﯽ ﺣﻠﻮا ﺳﯿﺎه ﺷﺎﻣﻞ ﻃﻮل ﮐـﻞ و وزن ﻣﺎﻫﯽ و ﻫﻤﭽﻨﯿﻦ ﭘﺎراﻣﺘﺮﻫﺎي زﯾﺴﺖ ﺳﻨﺠﯽ اﺗﻮﻟﯿﺖ از ﺟﻤﻠﻪ ﻃﻮل و وزن اﺗﻮﻟﯿﺖ ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺖ. ﺗﻌﯿﯿﻦ ﺳﻦ ﺑﺮاﺳﺎس وﺟﻮد دواﯾﺮ رﺷﺪ ﺳﺎﻻﻧﻪ (ﻻﯾﻪ ﻫﺎي ﻣﺎت و ﺷﻔﺎف) ﻣﻮﺟﻮد ﺑﺮ روي ﻣﻘﺎﻃﻊ اﺗﻮﻟﯿﺖ ﺻﻮرت ﮔﺮﻓﺖ. ﺑﯿﺸﺘﺮﯾﻦ ﺳﻦ ﺑﺪﺳﺖ آﻣﺪه 6 ﺳﺎل ﻣﺘﻌﻠﻖ ﺑﻪ ﻣﺎﻫﯽ ﺣﻠﻮا ﺳﯿﺎه ﺑﺎ ﻣﯿﺎﻧﮕﯿﻦ وزن 28 ±1957 ﮔﺮم و ﻃﻮل2/2 ±3 /483 ﺳﺎﻧﺘﯽ ﻣﺘﺮ ﺑﻮد. راﺑﻄﻪ ﻣﻌﻨﯽ داري ﺑﯿﻦ ﻃﻮل ﮐﻞ و ﺳﻦ ﻣﺎﻫﯽ و ﻫﻤﭽﻨﯿﻦ وزن ﮐﻞ و ﺳﻦ ﻣﺎﻫﯽ ﻣﺸﺎﻫﺪه ﺷﺪ ( ﻫﻤﭽﻨﯿﻦ ارﺗﺒـﺎط ﻣﻌﻨـﯽ دار ﺑﯿﻦ ﻃﻮل و وزن اﺗﻮﻟﯿﺖ، ﺑﯿﻦ ﻃﻮل ﻣﺎﻫﯽ و ﻃﻮل اﺗﻮﻟﯿﺖ و ﺑﯿﻦ ﻃﻮل اﺗﻮﻟﯿﺖ و وزن ﻣـﺎﻫﯽ ﻣﺸـﺎﻫﺪه ﺳﺎﻟﮕﯽ ﺗﻔﺎوت ﻫﺎي6 ﺗﺎ 4ﺷـﺪ. ﻏﻠﻈﺖ اﺳﺘﺮاﻧﺴﯿﻢ ﺑﻪ ﻃﻮر ﮐﻠﯽ ﺑﺎ ﻓﺎﺻﻠﻪ از ﻫﺴﺘﻪ (ﺳﻦ)اﻓﺰاﯾﺶ ﯾﺎﻓﺖ. ﺳﺪﯾﻢ و ﭘﺘﺎﺳﯿﻢ در ﺑﯿﻦ ﺳﻨﯿﻦ را ﺑﯿﻦ ﻣﻨﺎﻃﻖ ﺗﯿﺮه و روﺷﻦ (زﻣﺴﺘﺎﻧﯽ و ﺗﺎﺑﺴﺘﺎن) اﺗﻮﻟﯿﺖ ﻧﺸﺎن دادﻧﺪ، اﻣﺎ ﮐﻠﺴﯿﻢ و اﺳﺘﺮوﻧﺘﯿﻮم ﺗﻔﺎوت ﻓﺼﻠﯽ را ﻧﺸﺎن ﻧﻤﯽ دادﻧﺪ. ﻧﺘﺎﯾﺞ اﯾﻦ ﺗﺤﻘﯿﻖ ﻧﺸﺎن داد ﮐﻪ در ﮔﻮﻧﻪ ﻣﻮرد ﻣﻄﺎﻟﻌﻪ، دو ﭘـﺎراﻣﺘﺮ ﻃﻮل اﺗﻮﻟﯿﺖ و وزن اﺗﻮﻟﯿﺖ ﺑﻪ ﻋﻨﻮان ﺷﺎﺧﺼﻬﺎي ﺗﻌﯿﯿﻦ ﮔﻮﻧﻪ ﺑﻪ ﮐﻤﮏ اﺗﻮﻟﯿﺖ .ﻣﯿﺘﻮاﻧﺪ ﻣﻮرداﺳﺘﻔﺎده ﻗﺮار ﮔﯿﺮﻧﺪ.

This study aims to investigate the concentration of strontium, potassium, sodium and sodium elements along the chronological transects of sectioned sagittae otolith as well as to compare the otolith morphometric parameters of Black pomfret (Parastromateus niger) from North coast of Oman Sea (Sistan and Baluchistan province). Morphometric characteristics including total length, total weight of fish, and otolith morphometric parameters including otolith length and otolith weight were investigated. The age determination was based on the existence of annual growth rings (opaque and transparent layers) on the otolithic sections. The maximum age was 6 years old and belonged to Black pomfret with a mean weight and length of 1957 ± 28 g and 483.3 ± 2.3 mm, respectively. There was a significant relationship between total length and age of fish and total weight and age of fish (p <0.05). Furthermore, a significant relationship was observed between otolith length and weight, fish length and ottolith length, and otolith length and fish weight. The strontium concentration generally increased by the increase distance from the otolith core (age). Sodium and potassium showed differences between the dark and bright regions of otolith between the ages of 4 and 6 years. But calcium and strontium did not show a seasonal difference. Also, the results of this study showed two parameters of otolith length and otolith weight as determinants of the species using otolith can be used. Also, the results of this study showed two parameters of otolith length and weight using as a species characteristic index.