Effects of Temperature and pH on Digestive Enzyme Activities in Intestine and Hepatopancreas of Blood Parrot (Amphilophus citrinellus × Paraneetroplus synspilus)
The effects of temperature and pH on the activities of protease, amylase and cellulase in intestine and hepatopancreas of blood parrot were studied. The results showed that the digestive enzyme activity of blood parrot increased first and then decreased with the increase of temperature and pH. The optimum temperature of protease was 55˚C, 45˚C, amylase was 35˚C, 25˚C, cellulase was 45˚C. The optimal pH of protease was 8.0, 10.0, amylase was 7.0, and cellulase was 5.0. Under the optimum temperature, the order of the activity of blood parrot protease was intestine > hepatopancreas, the order of the activity of amylase was hepatopancreas > intestine; under the optimum pH, the order of the activity of blood parrot protease was hepatopancreas > intestine, the order of the activity of amylase was intestine > hepatopancreas.