sign in
2018Volume 76
2017Volume 75
2016Volume 74
2015Volume 73
2014Volume 72
2013Volume 71
2012Volume 70
2011Volume 69
2010Volume 68
2009Volume 67
2008Volume 66
2007Volume 65
2006Volume 64
2005Volume 63
2004Volume 62
2003Volume 61
2002Volume 60
2001Volume 59
2000Volume 58
1999Volume 57
1998Volume 56
1997Volume 55
1996Volume 54
1995Volume 53
1994Volume 52
Download file(Article is in Project-Id-Version: Croatian Journual of Fisheries
POT-Creation-Date: 20.04.2014.
PO-Revision-Date:
Last-Translator: Marina Piria
THE EFFECT OF SEASONAL TEMPERATURE ON ENDOGENOUS GUT ENZYME ACTIVITY IN FOUR AIR-BREATHING FISH SPECIESKeywords:
air-breathing fishtemperatureenzyme activity
Volume: 76
Issue: 2
Pages: 60 - 65
The digestion process in fish is a complex phenomenon and is accomplished with the help of both endogenous and exogenous enzymes. A wide range of enzymes have been reported in fish and their secretion and concentrations highly depend on feeding habits, gut structure and environmental conditions. In this present investigation, we have demonstrated the activity of two endogenous enzymes (protease and amylase) in four economically important air-breathing fish species (Clarias batrachus, Channa punctatus, Anabas testudineus and Heteropneustes fossilis) at different seasonal temperatures. Our results demonstrated that protease activity was higher in all fish during the month of May, followed by September and December. It was also detected that enzyme activity was higher in the hindgut region (HG) compared to the foregut (FG), which suggests that HG is more active in digestion compared to FG. The optimization of feeding efficiency in aquaculture industries is very important, as the cost of feed is high and its availability is also limited. The information presented may be of importance when developing optimized diets and feeding regimes for the species considered.