بررسی تغییرات شیمی بافتی دستگاه گوارش تاس ماهی ایرانی (Acipenser persicus) از مرحله هچ تا زمان رهاسازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران

2 استاد گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران

3 کارشناس مجتمع تکثیر و پرورش ماهیان خاویاری شهید رجایی، ساری

4 دانشیار گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران

چکیده

در این بررسی چگونگی تکامل هیستوشیمی دستگاه گوارش لارو ماهی قره‌برون (Acipenser persicus) از مرحلة یک‌روزگی تا 35‌روزگی (زمان انگشت‌قد) با استفاده از میکروسکوپ نوری انجام گرفت. لولة گوارش لارو تازه‌تفریخ‌شده به صورت لوله‌ای مستقیم و تمایزنیافته است که از دهان به سمت مخرج کشیده شده است. هفت روز پس از تفریخ لولة گوارش کمی تمایز یافته و ترشحات اندکی به علت حضور سلول‌های جامی‌شکل در اپیتلیوم دهان، حلق و مری دیده شد. در این مرحله لایة نازکی از ترکیبات موکوپلی‌ساکاریدی خنثی سطح اپیتلیوم لولة گوارشی را پوشاند. با شروع تغذیة فعال (نه روز پس از تفریخ) دستگاه گوارش مانند بالغان به دهان، حلق، مری، معده (غده‌ای و غیر غده‌ای)، رودة ابتدایی، میانی و انتهایی تمایز یافت. ترکیبات پروتئینی به‌ویژه در چین‌های مخاطی مری و معده دیده شد که با گذشت زمان همراه با افزایش فعالیت آنزیمی معده و روده این حالت ناپدید شد. نتایج این بررسی نشان داد که تکامل آنتوژنی دستگاه گوارش ماهی قره‌برون مشابه با دیگر گونه‌های ماهیان خاویاری است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A histochemical of developing digestive tract of Persian sturgeon (A. persicus) from hatching to fingerling

نویسندگان [English]

  • Maryam Batebi Navaei 1
  • Bagher Mojazi Amiri 2
  • Rajab Mohammad Nazari 3
  • Mohammad Ali Nematolahi 4
  • Mostafa Karaminasab 1
1 MS.c., Department of Fisheries Sciences, University of Tehran, Karaj, Iran
2 Professor, Department of Fisheries Sciences, University of Tehran, Karaj, Iran
3 Shahid Rajai Reproduction Center, Sari, Iran
4 Associate Professor, Department of Fisheries Sciences, University of Tehran, Karaj, Iran
چکیده [English]

Histological development of digestive tract of the Persian sturgeon (Acipenser persicus) from hatching to fingerling size was studied using light microscope. The digestive tract of newly hatched larvae was a simple tube which continued from mouth to anus. In 7 days post hatching, digestive tract became differentiated and secretion was started smoothly, with appearance of goblet cells in epithelium of the mouth, pharynx and esophagus. In this stage, a thin layer of neutral mucopolysacharid component covered the epithelium of digestive tract. Nine days post hatching (exogenous feeding), this canal became differentiated into mouth, pharynx, esophagus, glandular and non-glandular stomach, anterior and posterior parts of the intestine, similar to adults at the onset of exogenous feeding, goblet cells appeared at intermediate and specially posterior part of the intestine and secretion role in this cells started that increased gradually. Present results reveal that the ontogenetic development of the digestive tract of Persian sturgeon is similar to Acipenserid species. However, there exist differences referred to the differentiation time of some digestive structures, such as the differentiation of taste bud, present of mouth and esophagus which affect first feeding time.

کلیدواژه‌ها [English]

  • Acipenser persicus
  • Digestive tract
  • histochemical study
  • Sturgeon

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