ارزیابی نرخ هم‌آوری در ماهیان Alburnus sellal و A. atropatenae و ارتباط آن با طول، وزن و سن ماهی در حوضه‌های تیگره و دریاچة ارومیه ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشکدة آبزی‌پروری آب‌های داخلی، موسسة تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندرانزلی، ایران.

2 گروه شیلات، دانشکدة منابع طبیعی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران.

3 گروه زیست‌شناسی دریا، دانشکدة علوم، دانشگاه گیلان، رشت، ایران.

10.22059/jfisheries.2026.409897.1476

چکیده

Alburnus sellal و A. atropatenae متعلق به خانوادة کپورماهیان سرمخروطی (Leuciscidae) هستند که در ایران به ­ترتیب در جنوب غرب و حوضه دریاچة ارومیه پراکنش داشته و از لحاظ اکولوژیک و صید تفریحی اهمیت دارند. هدف اصلی این پژوهش، بررسی ارتباط هم‌آوری با طول، وزن و سن این ماهیان در رودخانه ­های گاماسیاب، قلعه‌چای و مهابادچای بود. بدین‌منظور نمونه‌برداری ماهی در سال ­های 1387 و 1390 با استفاده از تور پرتابی و الکتروشوکر صورت گرفت. نتایج بررسی بروی 47 نمونه ماهی مادة A. sellal و 37 نمونه ماهی مادة A. atropatenae نشان داد که هم‌آوری مطلق کل (مجموع تخمک ­های کوچک، متوسط و بزرگ در تخمدان) در ماهی A. sellal 13021-1160 (3037/3±5577/7) و در ماهی A. atropatenae 6588-1205 (3113/2±1252) عدد تخمک است. هم‌آوری نسبی کل در گونة A. sellal 507-125 (263/3±86/1) و در گونة A. atropatenae 297-144 (197/8±41/1) عدد در هر گرم وزن بدن محاسبه گردید. میزان همبستگی (r2) بین هم‌آوری مطلق کل و وزن بدن، طول کل و سن در گونة A. sellal به‌ترتیب 0/59، 0/67 و 0/45 و در گونة  atropatenae A. 0/69، 0/72 و 0/47 تعیین شد. میانگین هم‌آوری مطلق کل برحسب سن، وزن بدن و طول کل ماده­ ها در هر 2 گونه با افزایش سن افزایش معنی­دار نشان داد (0/05˂P). همچنین میانگین قطر تخمک­ های بزرگ در تخمدان­ ماهیان آمادة تخمریزی گونه ­های A. sellal و A. atropatenae به ­ترتیب 0/17±315/35 و 0/06±1/40 میلی‌متر تعیین شد. در یک نتیجه­ گیری می­ توان گفت که این 2 گونه ماهی جزء ماهیان تخمریز متناوب‌اند (batch spawner) و در فصل تولیدمثل، 3-2 بار تخمریزی دارند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Assessment of fecundity rates in Alburnus sellal and A. atropatenae and their relationships with length, weight and age in Tigris and Urmia Lake basins of Iran

نویسندگان [English]

  • Keyvan Abbasi Ranjbar 1
  • Zaniar Ghafouri 2
  • Yaseman Sayyadoghli 3
1 Inland Waters Aquaculture Research Center, Iranian Fisheries Sciences Research Institute, Agricultural Research, Education and Extension Organization, Bandar Anzali, Iran.
2 Department of Fisheries, Faculty of Natural Resources, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.
3 Department of Marine Biology, Faculty of Science, University of Guilan, Rasht, Iran.
چکیده [English]

Alburnus sellal and A. atropatenae belong to Leuciscidae family, and are found in southwestern and Urmia Lake basins of Iran, respectively. These fish have ecological and sport fishing values as well. The main purpose of this study was to investigate the relationship between the fecundity with length, weight and age in Gamasiab, Ghaleh-Chai and Mahabad-Chai Rivers. For this purpose, fish sampling was performed in 2008 and 2011 using electrofishing device and Cast-net. The results of the investigation on 47 spicemens of female A. sellal and 37 spicemens of A. atropatenae showed the total absolute fecundity (sum of large, medium and small eggs) in the A. sellal, is 1160-13021 (5571.7±3037.3, average±S.D) and for A. atropatenae, 1205-6588 (3113.2±1252). The total relative fecundity was estimated 125-507 (263.3±86.1) in A. sellal and 144-297 (197.8±41.1) in A. atropatenae per gram of body weight. The correlation (r2) between total absolute fecundity and body weight, total length and age were determined 0.59, 0.67 and 0.45, respectively for A. sellal and 0.69, 0.72 and 0.47 respectively, for A. atropatenae. The average total absolute fecundity increased in relation to age, weight and length of females with significant difference (P<0.05). Also, the mean egg diameter of large batches in the ovaries of readily spawning specimens was determined 0 1.35±0.17 and 1.04±0.06 mm for A. sellal and A. atropatenae, respectively. In conclusion, it can be said that these two fish species are batch spawners and spawn 2-3 times during the breeding season.

کلیدواژه‌ها [English]

  • Freshwater fishes
  • Iran
  • River
  • Reproduction
  • Spawning
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