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Effect of Feeding on the Structure of the Digestive Gland of the Tropical Sepioid Idiosepius Pygmaeus

Published online by Cambridge University Press:  11 May 2009

Jayson M. Semmens ,
N.A. Moltschaniwskyj  and
C.G. Alexander
Jayson M. Semmens
Affiliation:
Department of Marine Biology, James CookUniversity of North Queensland, Townsville, Queensland 4811, Australia
N.A. Moltschaniwskyj
Affiliation:
Department of Marine Biology, James CookUniversity of North Queensland, Townsville, Queensland 4811, Australia
C.G. Alexander
Affiliation:
Department of Marine Biology, James CookUniversity of North Queensland, Townsville, Queensland 4811, Australia
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Extract

The digestive gland of the tropical sepioid Idiosepius pygmaeus (Steenstrup) (Cephalopoda: Idiosepiidae) is characterized by a single cell type which secretes proteinaceous spherical bodies, the secretory spheres. Changes in the structure of the gland with feeding were investigated through a field sampling programme and a laboratory feeding experiment. Specimens were collected in the field on three consecutive days. There was a significant increase in the number of spheres during the day. A laboratory-based night trial showed that numbers of secretory spheres remained high during the night. After feeding there was a rapid and marked increase in the number of secretory spheres, suggesting that upon registering a stimulus the digestive gland secretes large amounts of enzymes. The process is rapid with an increase in the number of spheres occurred one hour after feeding. A second peak occurred 16 hours after feeding, suggesting that there may be two phases to the digestive cycle. This study examined natural and experimental patterns in the digestive gland and estimated the time involved in the digestive activity of I. pygmaeus.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 75 , Issue 4 , November 1995 , pp. 885 - 897
Copyright
Copyright © Marine Biological Association of the United Kingdom 1995

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