Influence of insoluble dietary cellulose on digestive enzyme activity, feed digestibility and survival in the red claw crayfish, Cherax quadricarinatus (von Martens)
Pavasovic, Ana, Richardson, Neil A., Mather, Peter B., & Anderson, Alex J. (2006) Influence of insoluble dietary cellulose on digestive enzyme activity, feed digestibility and survival in the red claw crayfish, Cherax quadricarinatus (von Martens). Aquaculture Research, 37(1), pp. 25-32.
Red claw (Cherax quadricarinatus) is a freshwater crayish species with recognized potential for aquaculture. To better understand the digestive processes and nutritional requirements of red claw, we have examined the effects of dietary cellulose on (1) digestive enzyme activity and diet digestibility and (2) survival rate, feed conversion ratio and growth performance. In the first study, a reference diet (RF) and test diets consisting of 70% RF and 30% a-cellulose or Fuller’s earth were prepared. Analysis of digestive enzyme profiles revealed that amylase and cellulase activities in midgut gland (MG) extracts were highest in the red claw fed on a diet containing 30% Fuller's earth and lowest in those fed on a diet containing 30% a-cellulose. Supplementation of the RF diet with either 30% a-cellulose or Fuller’s earth signi¢cantly reduced apparent dry matter ADMD) and apparent protein digestibilities (APD). In the second study, a feeding trial was conducted using diets supplemented with different levels of a-cellulose. A major finding was that dietary cellulose levels above 12% were correlated with signifcant reductions in survival rate, specific growth rate and feeding efficiency. Based on these findings,we suggest that although cellulase enzymes are present in the red claw digestive system there are no apparent nutritive benefits obtained by including insoluble cellulose in diets for this species.
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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal's website (see hypertext link) or contact the author. Author contact details: firstname.lastname@example.org|
|Keywords:||red claw, Cherax, cellulose, digestive enzymes, fibre, nutrition|
|Subjects:||Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > PHYSIOLOGY (060600) > Animal Physiology - Systems (060603)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
Past > Institutes > Institute for Sustainable Resources
|Copyright Owner:||Copyright 2006 Blackwell Publishing|
|Deposited On:||13 Jul 2007|
|Last Modified:||29 Feb 2012 23:28|
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