Asian-Pacific Aquaculture 2019

June 19 - 21, 2019

Chennai Tamil Nadu - India

POSTPRANDIAL DIGESTIVE PHYSIOLOGICAL CHANGES IN GOLDEN MAHSEER Tor putitora JUVENILES

Prakash Sharma*, Debajit Sarma and M. S. Akhtar
ICAR-Directorate of Coldwater Fisheries Research, Bhimtal-263136, Uttarakhand, India.
E-mail address: prakashsharma1979@gmail.com
 

Postprandial samples of 45 and 90 days post hatching (dph) golden mahseer (Tor putitora) juveniles were taken in triplicates, at 1, 6, 12, 18 and 24 hours of feeding, for identification of potential histological appetite markers such as goblet cell (GC) dynamics (esophagus, fore, mid and hindgut), luminal dynamics, pancreatic zymogen granules (PZGs), and hindgut supra-nuclear vesicles (SNVs). At 6 hours of feeding, numbers of GC in esophagus were found to be drastically lower compared to all other time, and the gradual building up of same was found after 12 hours. Foregut distention was found to be started at 1 hour, peaked at 6, and constriction continued until 24 hours. A gradual progression in density and size of SNVs in hindgut were observed between 6 to 12 hours of feeding; in 18 to 24 hours, they were found to be gradually decreasing. The hindgut-GCs on the other hand, were seen to be frequent at 24 hours. Maximum reduction in PZGs was seen at 6 hours of feeding; and following that, the gradual increase was seen at 12, 18, and 24 hours. Long story short, in November (15-17 ºC, on macerated goat liver diet), digestion in golden mahseer juvenile peaks at around 6 hours of post feeding, absorption of nutrients last from 6 to 12 hours. Based on interplay of these identified appetite markers, it can be concluded that digestion apparatus in golden mahseer juveniles starts to reorganize and get ready for second meal after 6 hours of post feeding.