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BEAM3 (Cochet and Gilly, 1990) is a stochastic model that can handle up to four species (or two species by two sexes) and many fleets operating sequentially or simultaneously. The recruitment can be considered constant or variable. The model aims at determining the optimum size, in the long term, of the level of fishing capacity corresponding to the management goals if one accepts a given level of risk. It calculates the probability density functions of the outputs and their distribution among fleets and allows for the determination of the probabilities of occurrence of undesirable economic results. This model was tested on the French Guyana fisheries (2nd FAO/WECAF Workshop on Biological and Economic Modelling of the Shrimp Resources on the Guyana Brazil Shelf, Cayenne, French Guyana, May 1988)

Key Features

  1. Creation or modification of parameter file.
  2. Simulation
  3. Graphical presentation

System Requirements:
The software has been compiled using Microsoft Quick Basic and can run on any PC or PC compatible computer that has at least 640 KB RAM and ODS version 2.11 or later.

The running time of a simulation depends on the number of fleets and species being considered and the type of the processor, e.g., 180286 or 180386. For example, with 4 species, 25 size classes asnd 3 fleets, each iteration lasts 1 second with an AT180286 microcomputer or 15 seconds with an XT18086 PC.

Printing on a graphics printer can be done through a hard copy, if GRAPHICS utility has been defined.

Statistics and Information Branch (FIAS)

Fisheries and Aquaculture Department
Food and Agriculture Organization of the United Nations
Viale delle Terme di Caracalla

Email: Fish-Statistics-Inquiries

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