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Deep Demersal Fish Assemblage Structure in the Porcupine Seabight (Eastern North Atlantic): Results of Single Warp Trawling at Lower Slope to Abyssal Soundings

Published online by Cambridge University Press:  11 May 2009

N. R. Merrett ,
R. L. Haedrich ,
J. D. M. Gordon  and
M. Stehmann
N. R. Merrett
Affiliation:
Port Erin Marine Laboratory (University of Liverpool), Port Erin, Isle of Man
R. L. Haedrich
Affiliation:
Ocean Sciences Centre, MemorialUniversity of Newfoundland, St. John's, Newfoundland, A1B X9, Canada
J. D. M. Gordon
Affiliation:
Dunstaffnage Marine Laboratory, PO Box 3, Oban, Argyll, PA AD
M. Stehmann
Affiliation:
Ichthyologie, Institut fur Seefischerei, c/o Zoological Museum, Martin-Luther-King-Platz 3, D-2000 Hamburg 13, Germany
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Extract

The dynamics of clearance, segregation and elimination of a marine bacterium, Moraxella sp., by the shore crab, Carcinus maenas (L.) has been studied utilizing fluorescent and radiolabelling techniques. In addition to the gills, the hepatopancreas was a major site of bacterial accumulation with sequestration occurring within haemocyte clumps and groups of stationary cells in this organ. The heart, excretory organ and subcuticular tissues also incorporated bacteria, but to a lesser extent. By the first day post-injection, many of the segregated micro-organisms had been removed from the organs. This latter process was not due to the exodus of laden haemocytes or of intact cell clumps from the host but seemed to result from lytic action by the host blood cells. Little material arising from such bacterial/haemocytic interaction was, however, immediately excreted, and much was relocated in the general body tissues as well as the gill nephrocytes.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 71 , Issue 2 , May 1991 , pp. 359 - 373
Copyright
Copyright © Marine Biological Association of the United Kingdom 1991

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