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The biology of Cucumaria elongata (Echinodermata: Holothuroidea)

Published online by Cambridge University Press:  11 May 2009

John D. Fish
John D. Fish*
Affiliation:
Dove Marine Laboratory, University of Newcastle-Upon-Tyne
*
*Present address: Department of Zoology, University College of Wales, Aberystwyth, Wales.
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Extract

A population of Cucumaria elongata (Düb & Kor.), found in muddy sand off the Northumberland coast, has been sampled from 1961 to 1964. Densities of more than 20 per m were common.

Cucumaria is a suspension feeder, and uses its tentacles to trap suspended paniculate matter. In the absence of mucous glands or cilia on the tentacles, suspended matter is held fast in a covering of mucus which is produced by glands in the pharynx and oesophagus. Each time the tentacles are introduced into the pharangeal lumen in the course of feeding, they pick up a fresh complement of mucus.

The feeding behaviour is seasonal. During the early part of October the animals stop feeding, and remain dormant until late April/early May of the following year.

The results of monthly experiments to determine the oxygen consumption, percentage of total lipid and the volume/dry-weight ratio, have led to the conclusion that during the winter months Cucumaria hibernates.

The effect of temperature on the feeding behaviour is discussed.

Regular quantitative sampling has shown that Cucumaria is slow growing, and over the area surveyed, four different age-groups were found. These have been designated groups I, A, B and C. Group I was estimated to be 2 years old; group A, 6 six years; group B, 8 years; and group C, 10 years old.

Although active sperm and apparently mature eggs were found in specimens collected as far back as 1962, there is no evidence to suggest that any of the age-groups has reproduced.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 47 , Issue 1 , February 1967 , pp. 129 - 144
Copyright
Copyright © Marine Biological Association of the United Kingdom 1967

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