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Submitted on: 28 December 1998.
Revised on: 28 March 1999.
Accepted on: 14 April 1999.
___________________AQUATIC LIVING RESOURCES---EDP SCIENCES S A
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Submitted on: 30 August 1998.
Revised on: 01 October 1998.
Accepted on: 22 November 1998.
___________________AQUATIC LIVING RESOURCES---EDP SCIENCES S A