مطالعه الگوی رشد ماهی سفید Rutilus kutum Kamensky, 1901 در رودخانه سفیدرود- استان گیلان

نوع مقاله : مقاله کامل علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری تولید و بهره‌برداری آبزیان، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبدکاووس، گنبدکاووس، ایران.

2 نویسنده مسئول، دانشیار گروه شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبدکاووس، گنبدکاووس، ایران.

3 دانشیار گروه شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبدکاووس، گنبدکاووس، ایران.

4 استادیار گروه شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبدکاووس، گنبدکاووس، ایران

5 دانشیار گروه شیلات، مؤسسه تحقیقات علوم شیلاتی کشور، تهران، ایران.

چکیده

مطالعه پارامترهای رشد و ساختار درون جمعیتی، تفسیر، تجزیه و تحلیل‌ها و پیش‌بینی‌های مرتبط به فراوانی جمعیت‌های یک گونه را ممکن می‌سازد و رودخانه سفید رود به‌عنوان مهم ترین رودخانه شیلاتی کشور در استان گیلان نقش بسیار مهمی را در زادآوری و بازسازی ذخایر ماهی سفید دارد، برای یک بازه زمانی 10 ساله (1388 تا 1398) مورد مطالعه قرار گرفت.
بیشترین میانگین طول کل و وزن کل برای هر دو جنس نر و ماده در سال 1393 بدست آمد که به‌ترتیب برای جنس نر 41/44 سانتی‌متر و 72/943 گرم و برای جنس ماده 49/50 سانتی‌متر و 98/1401 گرم بدست آمد که با سال‌های دیگر اختلاف معناداری داشتند (05/0 > p). نوع الگوی رشد برای جمعیت ماهی سفید در سال‌های 1392، 1393 و 1396 از نوع ایزومتریک، در سال‌های 1389، 1390، 1391، 1394 و 1395 از نوع آلومتریک مثبت و در سال‌های 98-1397 از نوع آلومتریک منفی بدست آمد. بالاترین مقدار ضریب وضعیت در سال 1398 و کمترین مقدار آن نیز در سال 1394 بدست آمد (05/0 < p). نتایج نشان داد در همه سال‌های مورد مطالعه با افزایش سن برای جمعیت طول کل و وزن کل نیز افزایش داشت. طول بی‌نهایت (L∞) در جمعیت‌ها در دوره 10 ساله بین 74/87- 11/73 سانتی‌متر بدست آمد. دامنه آهنگ رشد (K) در این مطالعه برای جمعیت‌ها بین 19/0- 08/0 بدست آمد. شاخص سن صفر (t0) برای جمعیت‌ها بین 46/0- تا 93/0- و شاخص فی مونرو (ф) در جمعیت‌ها بین 18/6 تا 28/7 بدست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of the growth pattern of kutum (Rutilus kutum Kamensky, 1901) in SefidRood River - Gilan Province

نویسندگان [English]

  • Nasser Karami Rad 1
  • Hojatullah Jafarian 2
  • Rahman Patimar 3
  • Mohammad Farhangi 4
  • Hossein Ali Abdulhai 5
1 Ph.D. Student of Aquaculture Production and Exploitation, Faculty of Agriculture and Natural Resources, Gonbadkavos University, Gonbadkavos, Iran.
2 Corresponding Author, Associate Prof., Dept.of Fisheries, Faculty of Agriculture and Natural Resources, Gonbadkavos University, Gonbadkavos, Iran
3 Associate Prof., Dept.of Fisheries, Faculty of Agriculture and Natural Resources, Gonbadkavos University, Gonbadkavos, Iran.
4 Assistant Prof., Dept. of Fisheries, Faculty of Agriculture and Natural Resources, Gonbadkavos University, Gonbadkavos, Iran.
5 Associate Prof., Dept. of Fisheries, National Institute of Fisheries Sciences, Tehran, Iran
چکیده [English]

The kutum of the Caspian Sea has long been familiar with the life of coastal people, so that it has played a significant role in the economy of the coastal cities of the south of the Caspian Sea, and the living resources of the Caspian Sea, especially its economic fish stocks, have been seriously attacked in the past few years due to various crises. The study of growth parameters and intra-population structure makes interpretation, analysis and predictions related to the abundance of populations of a species possible, and Sefidrood River, as the most important fishing river of the country in Gilan province, plays a very important role in reproduction and stock enhancement of kutum. It was studied for a period of 10 years (2010 to 2019).
The highest average total length and total weight for both males and females was obtained in 2014, which was 44.41 cm and 943.72 grams for males, and 50.49 cm and 1401.98 grams for females, respectively. Other years had significant differences (p < 0.05). The type of growth pattern for kutum population was obtained in 2013, 2014 and 2017 from isometric type, in 2010, 2011, 2012, 2015, 2016, positive allometric type and in 2018-2019 from negative allometric type. The highest value of the condition coefficient was obtained in 2019 and the lowest in 2015 (p < 0.05). The results showed that in all the studied years, total length and total weight also increased with increasing age for the population. The infinite length (L∞) in the populations in the 10-year period was between 73.11-87.74 cm. The range of growth rate (K) in this study for populations was between 0.08-0.19. Zero age index (t0) for populations was between -0.46 until -0.93, and Monro's Phi index (ф) was obtained between 6.18 until 7.28 in populations.

کلیدواژه‌ها [English]

  • kutum
  • Growth pattern
  • Sefidrood River

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مجله بهره برداری و پرورش آبزیان
دوره 12، شماره 4
دی 1402
صفحه 185-206

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