بررسی برخی پارامترهای رشد ماهی تیزه کولی Hemiculter Leucisculus (Basilewsky, 1855) در رودخانه گرگانرود

نوع مقاله : مقاله کامل علمی - پژوهشی

نویسندگان

1 فارغ التحصیل کارشناسی ارشد شیلات

2 گنبد کاووس- خیابان شهید فلاحی-دانشگاه گنبد کاووس

چکیده

گونه تیزه کولی (Hemiculter leucisculus) از خانواده کپور ماهیان (Cyprinidae) و غیربومی ایران بوده و اطلاعات بسیار محدودی در مورد زیست‌شناسی آن وجود دارد. مجموع 91 قطعه ماهی تیزه کولی (H. leucisculus) در رودخانه گرگانرود از فروردین تا تیر ماه 91 توسط دستگاه الکتروشوکر بصورت تصادفی صید و سپس با فرمالین 10 درصد تثبیت گردید. نسبت جنسی نر به ماده در جمعیت مورد مطالعه 53/1 : 1 و نرها غالب بودند. بیشینه طول کل و وزن ماده‌ها 107 میلی‌متر و 17/12 گرم و برای نرها 112 میلی‌متر و 50/12 گرم ثبت گردید. بیشینه ضریب وضعیت برای جنس نر در خرداد ‌ماه (1/2) و برای جنس ماده در تیر‌ ماه (08/1) بدست آمد. بالاترین نرخ رشد لحظه برای هر دو جنس و در سنین جوانی مشاهده شد. از آنجاییکه دوره نمونه بردای 4 ماه بود، به نظر می‌رسد درک دقیق وضعیت تغییرات شاخص‌های بیولوژیکی نیازمند افزایش دوره نمونه‌برداری، افزایش تعداد نمونه‌های مورد مطالعه، صید گونه‌ها در اندازه‌های مختلف و پیگیری تغییرات و نوسانات گروه‌های سنی در طول عمر جمعیت مورد مطالعه می‌باشد. بهرحال اطلاعات ارائه شده می‌تواند برای درک پایه ایی از وضعیت این گونه در یکی از مناطق پراکنشی آن در شمال ایران مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of some Growth parameters of Hemiculter leucisculus (Basilewsky, 1855) in Gorganrood river

نویسندگان [English]

  • ali rezamand 1
  • Rahman patimar 2
چکیده [English]

Hemiculter leucisculus is an exotic Cyprinid species for Iran and little is known about its biology. A total of 91 samples of the species (H. leucisculus) were collected between April and July 2013 using electro-shocker randomly and fixed by 10% formalin. The sex ratio of male to female in the studied population was 1: 1.53 indicating males are dominant. The maximum total length and weight were 107 mm and 12.17g for females, 112 mm and 12.50g for males. The maximum condition factor obesrved for males was in June (2/1) and for females in July (1/08). The highest instantaneous growth rate was observed for both sexes in younger age groups. The sampling period was only 4 months, so it seems that a longer sampling period, larger sample size including all size classes are needed to achieve detailed information on biological parameters. Anyway, the provided data could be used as basic information about one of the populations of the species in northern Iran.

کلیدواژه‌ها [English]

  • H. leucisculus
  • Age and Growth
  • river
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