تعیین الگوی بهره‌برداری ماهی کلمه خزری، (Rutilus caspicus Yakovlev, 1870) در بخش جنوب شرقی دریای خزر (محدوده سواحل استان گلستان)

نوع مقاله: مقاله علمی - پژوهشی

نویسنده

دانشگاه گرگان

چکیده

ماهی کلمه خزر (Rutilus caspicus Yakovlev, 1870) یکی از گونه‌های با ارزش تجاری دریای خزر بوده که میزان صید آن نوسانات زیادی را طی دهه‌های گذشته داشته و در سال‌های اخیر ذخایر این ماهی تحت بهره-برداری بی رویه قرار گرفته است. داده‌های حاصل از زیست‌سنجی 246 نمونه از تورهای پره شرکت‌های تعاونی مستقر در سواحل جنوب شرقی دریای خزر در فصل صید 94-1393 مورد تجزیه و تحلیل قرار گرفت. نتایج نشان داد ماهیان صید شده در دامنه طولی 2/31- 5/14 سانتی‌متر بودند. الگوی رشد ماهی نر ایزومتریک و ماهی ماده آلومتریک منفی بود. در بررسی پارامترهای پویایی‌شناسی، طول بی‌نهایت (∞L) معادل 8/41 سانتی‌متر، 12/0=K، 239/1 =Z، 324/0 =M، 916/0= Fو 74/0= E برآورد شد. میزان بیوماس ماهی کلمه در سال 1393 به‌ترتیب معادل 417 کیلوگرم، میزان MSY معادل 215 کیلوگرم برآورد گردید، درحالیکه کل میزان صید مجاز معادل 28 کیلوگرم بود. به نظر می‌رسد مابقی صید در سبد صید غیرقانونی بوده ‌است. بر اساس نتایج بدست آمده، صید ماهیان کلمه از وضعیت مناسبی برخوردار نیست.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Determination of exploitation model for Rutilus caspicus in south east of Caspian Sea (Golestan Province)

چکیده [English]

Rutilus caspius is one of the most important and commericial species in southeast of Caspian Sea that its catch had high fluctant in past decads for overfishing. In this study, data obtained from 246 specimens caught from coastal sein cooperative companies (they are located in the southeast coast of the Caspian Sea) during the fishing season 2014-2015 were analyzed. Results showed individuals ranging from 14.5 to 31.2 cm total length. Growth model were isometric and negative alometric in male and female, respectively. The growth parameters of L∞, K, Z, M, F and E and were computed 41.8 cm, 0.12 year-1, 1.239, 0.324, 0.916 year-1 and 0.74, respectively. Fish biomass, Maximum sustainable yield (MSY) were equal to 417 Kg and 215 Kg, while the raion of catch was 28 Kg. It seems, the rest of it was in forbidden catch. Totally, catch situation of Caspian roach is not
suitable.

کلیدواژه‌ها [English]

  • Key words: Rutilus caspius
  • Caspian Sea coastal sein cooperative companies
  • population dynamics
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