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The digestive gland of the Southern Dumpling Squid (Euprymna tasmanica): structure and function

Citation

Swift, KR and Johnston, DJ and Moltschaniwskyj, NA, The digestive gland of the Southern Dumpling Squid (Euprymna tasmanica): structure and function, Journal of Experimental Marine Biology and Ecology, 315, (2) pp. 177-186. ISSN 0022-0981 (2005) [Refereed Article]

DOI: doi:10.1016/j.jembe.2004.09.017

Abstract

The cephalopod digestive gland plays an important role in the efficient assimilation of nutrients and therefore the fast growth of the animal. The histological and enzymatic structure of Euprymna tasmanica was studied and used in this experiment to determine the dynamics of the gland in response to feeding. The major roles of the digestive gland were secretion of digestive enzymes in spherical inclusions (boules) and excretion of metabolic wastes in brown body vacuoles. High levels of trypsin, chymotrypsin and α-amylase, low levels of α-glucosidase and negligible carboxypeptidase activity were produced by the gland. There was no evidence of secretion of digestive enzymes in other organs of the digestive tract. Within 60 min of a feeding event, the gland produced increasing numbers of boules to replace those lost from the stomach during the feeding event. Initially, small boules were seen in the digestive cells, they increased in size until they are released into the lumen of the gland where they are transported to the stomach. There was no evidence of an increase in activity of digestive enzymes following a feeding event, despite structural changes in the gland. However, there was large variation among individuals in the level of digestive enzyme activity. A negative correlation between boule and brown body vacuole density suggested that the large variation in enzyme activity may be due to the digestive gland alternating between enzyme production and excretion. © 2004 Published by Elsevier B.V.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Swift, KR (Mrs Kate Swift)
Author:Johnston, DJ (Dr Danielle Johnston)
Author:Moltschaniwskyj, NA (Associate Professor Natalie Moltschaniwskyj)
ID Code:32828
Year Published:2005
Web of Science® Times Cited:12
Deposited By:TAFI - Aquaculture
Deposited On:2005-08-01
Last Modified:2006-04-01
Downloads:0

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