Aydın GİRGİN, Mustafa SARIEYYÜPOĞLU, Sibel KÖPRÜCÜ ŞİMŞEK

Histological study in the digestive tract on larval development of rainbow trout (Oncorhynchus mykiss, Walbaum, 1792)

Bu araştırmada yumurtadan yeni çıkan alabalık larvalarının gelişimleri incelendi. Yumurtadan çıktıktan birkaç saat sonra larvada sindirim sistemi, anüse bağlanır ve 2. günde ağızları açılıp, özofagus farklılaşmaya başlar. Mukoza kıvrımı çok sayıda kübik epitelyum ve kadeh hücrelerini içerir. Kadeh hücreleri Alcian mavisi ile pozitiflik, P.A.S. ile negatiflik gösterir. Özofagusun duvarı sirküler bir kas tabakası ile ince bir tunika serozadan oluşur. 10. günde iç kısımda ikinci bir ince longitudinal kas tabakası görülür. Yumurtadan çıktıktan 2 gün sonra larvada mide, özofagusun devamı şeklindedir. Goblet hücreleri gözlenememiştir. Mide duvarı sirküler bir kas tabakası ile ince bir tunika serozadan oluşur. Mide bezlerinin ilk belirtisi 22. günde gözlenmiştir.Yumurtadan çıktıktan sonraki 2. günde epitel hücrelerin bazofilik granüler sitoplazması ile apikal mikrovilluslar, P.A.S. ile hafif derecede boyanmıştır. İlk goblet hücreleri 3. günde görülmüştür. Karaciğer sinusoidleri 3. veya 4. günlerde görülür. Glikojen yoğunluğundan hücreler P.A.S. pozitiflik göstermiştir.

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