Workshop on Lagoon Management, Nador - Morocco, September 30- Cotober 5 1991

MEDRAP II
RAB/89/005-RER/87/009

FIELD DOCUMENT

91/6

WORKSHOP ON LAGOON MANAGEMENT
Nador - Morocco, Sebtember 30 – Octobre 5 1991

Edited by MEDRAP II Regional Center
Tunis - Tunisia

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying or otherwise, without the prior permission of the copyright owner. Application for such permission, with a statement of the purpose and extent of the reproduction, should be addressed to the Director, Publications Division, Food and Agriculture Organisation of the United Nations, Viale delle Terme di Caracalla, 00100 Rome, Italy.

Preparation of this Document

This document is one of a series of documents prepared during the course of the Project identified in the title page. The conclusions and recommendations given were considered appropriate at the time it was prepared. They may be modified in the right of further knowledge gained at subsequent stages of the Project.

The designations employed and the presentation of the material in this document do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organisation of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.

The opinions expressed by the Authors in this document are not necessarily those of FAO or the Governments of the participating countries.

This document was edited by Hassen AKROUT and Mohieddine BELKHIR in collaboration with Othman BÉJI and Neila KAFFEL, the revision was made by Michel LAMBŒUF.

Abstract

The main objectives of the Workshop on Lagoon Management, held in Nador from Septembre 30th to October 5 th, 1991, consisted in the initiation to the modelling concept and the elaboration of a technical document for the lagoon management in the Mediterranean and for the preservation of its environment. Three major components in lagoon ecosystem modelisation were considered for a better management:

- lagoon hydrodynamic modelling

- lagoon bilogical modelling

- lagoon economical modelling

On the matter of hydrodynamic modelling, it was stressed the need to gather data measurements to permit the description of the ecosystem functionning such as hydrodynamic parameters survey, sedimentology and geology monitoring, inlets evaluation and meteorological study.

It was recommended that:

hydrodynamic models should preceed any applications of management schemas including the aquaculture in lagoons.
MEDRAP member countries authorities should protect the ecosystem of lagoons.

Regarding the biological modelling, it was noted that a deep knowledge of the lagoon organisation and its functionning is required to the lagoon exploitation. The analysis of its process, in time and space, should lead to the understanding of the ecosystem and should establish its modelisation such as ecological, analytical and empirical modelisation. Due to its interface sea-land positions, the lagoon systems are subject to marine and continental double influence. The opening on the sea is essential to maintain the lagoon system. It was recommended the ecological equilibrium preservation, the assessment of the ecosystem carrying capacity, the establishment of monitoring and control surveys according to the management required. At a pilot project scale, studies, should be undertaken to develop and integrated research and to lead to modelisation.

The last aspects of modelling was discussed from the bio-economical and socio-economical point of view. The aquaculture activities should consider the external world (the lagoon itself, other human activities on the lagoon and the global socio-economic structure) and the internal-technical and economical world. The legal, economical and commercial and commercial aspects must be studied. It was recommended to the take into account the economic risks which may be harmful.

MEDRAP II was invited to help the countries by conceiving a methodology approach to be used as guidelines in lagoon management, initiating technicians in modelisation and elaborating a software applicable to the hydrodynamic lagoon study and realising a data base in the matter.

Acknowledgements

The Editor would like to thank the Moroccan Authorities, the «MAROST» Company and the National Coordinator, Mr. Mohamed Rami, for the remarkable help and assistance in the organisation of the meeting.

The Editor would also like to thank the participants and the invited experts for their positive contribution to the success of the meeting.

Note from the reviser

The revision and publication of this document could only be done a long time after the closure of the project. This has led to some difficulties in finalising the documents and implementing corrections, because authors and contributors as well as some of the original material or files were no longer available.

Therefore contributions from participants and session papers annexed to most of the documents were left in their original form. No language corrections were introduced, the content was not modified and left under their respective author's responsibility.

Considering the above, we hope that the reader will understand that a standard of publication could not e maintained on a level as high as we would have liked it to be.

United Nations Development Programme

Food and Agriculture Organisation of the United Nations

Hyperlinks to non-FAO Internet sites do not imply any official endorsement of or responsibility for the opinions, ideas, data or products presented at these locations, or guarantee the validity of the information provided. The sole purpose of links to non-FAO sites is to indicate further information available on related topics.

This electronic document has been scanned using optical character recognition (OCR) software. FAO declines all responsibility for any discrepancies that may exist between the present document and its original printed version.

Final Report

Workshop Agenda

List of participants

Communications

- Modélisation: Problématique d'aménagement et de gestion des lagunes on aquaculture
by M. BELKHIR, Tunisie

- Dynamique de marée le golfe Normand-Breton
by A. ORBI & J. C. SALOMON

- Modélisation hydrodynamique et biologique des lagunes: Application au lac de Tunis
by M.MOUSSA

- Ecological Planning : possible method for the choice of aquacultural sites
by E.DUTRIEUX & O.GUÉLORGET, France

- Trophic capacity of the bay of Marennes-Oléron
by C.BACHER, France

- Modélisation de la production de l'huître Crassostrea Gigas du bassin de Marennes-Oléron.
by O.RAILLARD & MENESGUEN, France

- Etude de l'impact du stock d'huîtres et des mollusques compéteurs sur les performances de croissance de crassostrea gigas, à l'aide d'un modèle de croissance
by C.BACHER, France

- Law and economic models for aquaculture (DRAFT)
by J.C.MARTINEZ COLL, Spain