عادات غذایی قزل‌آلای رنگین‌کمان (Oncorhynchus mykiss) در رودخانه بهشت‌آباد چهارمحال و بختیاری

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته گروه شیلات، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان،

2 دانشیار گروه شیلات، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان،

3 دانشیار گروه شیلات، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان

چکیده

ویژگی‌های تغذیه‌ای ماهی قزل‌آلای رنگین‌کمان با جمع‌آوری 355 نمونه از رودخانه مورد بررسی قرار گرفت. دامنه طول کل ماده‌ها  1/17-2/40 SD) 54 /4±05/26)و نرها 5/15 تا 3/40 (93/5±9/24) سانتی‌متر بود. از کل معده‌ها، 39 معده خالی بود (۱۱%) و در فصول مختلف اختلاف معنی‌داری نداشتند. این ماهی، 45 آرایه غذایی از 10 رده را مورد مصرف قرار داد. گروه‌های شناسایی شده شامل کرم‌های حلقوی و پهن، بندپایان، نرمتنان، مرجان‌های آب شیرین و ماهیان استخوانی بود. سخت‌پوستان، حشرات، شکم‌پایان و ماهی‌ّهای استخوانیدر تمامی ماه‌های سال توسط این گونه مورد مصرف قرار گرفت. ترکیب جیره غذایی نر و ماده تفاوت مشخصی را نشان نداد و رده‌ّهای غذایی عمده توسط هر دو جنس مصرف شدند، ولی با اندازه ماهی دارای تفاوت معنی‌داری بود و میانگین اندازه طعمه با افزایش ماهی افزایش یافت. در مجموع، ماهی قزل‌آلای رنگین‌کمان دامنه وسیعی از مواد غذایی جانوری را مصرف می‌کند و یک گونه گوشتخوار به شمار می‌رود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Feeding habits of Rainbow Trout (Oncorhynchus mykiss) in Beheshtabad River of Chaharmahal & Bakhtiari Province

نویسندگان [English]

  • Mosayeb Aalipour 1
  • Yazdan Keivany 2
  • Eisa Ebrahimi 3

1 Isfahan University of Technology

2 Associate Professor, Department of Natural Resources (Fisheries Division), Isfahan University of Technology, Isfahan

3 Associate Professor, Department of Natural Resources (Fisheries Division), Isfahan University of Technology

چکیده [English]

in the inland waters of Iran and little is known about this species in Iranian waters. In this study, some biological characteristics of rainbow trout (Oncorhynchus mykiss) as an exotic fish were examined in 355 specimens collected monthly from Beheshtabad River of Chaharmahal & Bakhtiari Province during April 2013 to March 2014. Total length of females and males ranged from 17.1 to 40.2 cm (26.05±4.54SD) and from 15.5 to 40.3 cm (24.9±5.93), respectively. Among all the examined stomachs, 39 were empty (Vacuity index, Vi= 11%). This variation was not significantly diffrent (P˃0.05) over the year and the maximum number of empty stomachs was recorded during the spring and the minimum during the autumn. The diet of the rainbow trout was composed of 45 different prey taxa, belonging to 10 main classes. The most important prey items were Annelida (Oligochaeta and Hirudinea), Platyhelminthes (Turbellaria), Arthropoda (Crustacea, Insecta and Archanida), Mollusca (Gastropoda and Lamellibranchiata), Coelenterata (Cnidaria) and Teleostei. Hirudinea, Crustacea, Insecta, Gastropoda, Teleostei and Lamellibranchiata were the most important prey items in all seasons. Crustacea, Insecta, Gastropoda and Teleostei were the most important prey items in all months. Sex did not appear to have any significant effects on the diet composition and on the main prey items consumed by the fish. Fish size showed significant effects on diet composition and the average size of prey increased with fish size. The rainbow trout could be considered a carnivorous fish, feeding on a wide range of prey items.

کلیدواژه‌ها [English]

  • Diet
  • Feeding
  • Salmonidae
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