Vol. 10, Special Issue 10 (2021)

Author(s):
Asifa Wali, Tasaduq H Shah, FA Bhat, MH Balkhi, Bilal Ahmad Bhat, Tariq Ahmad Bhat and Ishrat Mohd

Abstract:
Oncorhynchus mykiss, introduced in Kashmir more than a century ago, has established itself in almost all cold-water streams of the valley. For the study about 200 samples of O. mykiss was collected from the national trout fish farm Kokernag and different morphometric parameters related to the alimentary canal was analyzed. The highest gut weight (64.27g), intestinal length (335mm) and liver weight (16.81g) was observed in brood stage of the fish. The highest intestinal coefficient (1.2) and Zihler’s index (5.56) was found in fry stage whereas gut length (310mm) and relative gut length (1.2) was found to be highest in table size of fish. The digestive somatic index (0.24), hepatosomatic index (4.14%) and gastrosomatic index (24.13%) was seen highest for the fingerling stage. These indices helped to provide a technical knowhow of the digestive physiology of the species and knowledge regarding alimentary canal morphology is increasingly important for fish digestive functioning and for improving protocols for the fish nutrition.