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ASC: FLBEIA: A bioeconomic toolbox

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Dorleta Garcia

on 1 April 2014

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Transcript of ASC: FLBEIA: A bioeconomic toolbox

Impact Assessment

Existing bio-oriented models tend to simplify economic part and the other way around.
Biological models built on generally accepted models.
Fleet dynamic models are very case specific, standard models are not available.

"A model is nothing more than the ‘sum’ of its parts,
which can be individually modelled
and then put together ”
The model has been constructed modularly.
The fishery and management systems are defined as the “sum” of “small” processes.
Several models available for each process.
2 kind of processes:
Low level
: Stock recruitment, catch production function…
High level
: Population growth, fleets’ short term dynamics…
There are functions at different levels that assemble the models at lower levels.
A Bio-Economic simulation toolbox.
Oriented to conduct impact assessment of multiannual management plans.
Follows MSE framework.
Multi-stock and multi-fleet.
Built using R-FLR.
What is it?
Value given
Fully coupled: biologic and economic components.
Balance between both components.
Management advice can be given based on:
Real population.
Observed population through the whole management process
How is it built up?
Multi stock.
The stocks can be age structured or aggregated in biomas.
Seasonal cohorts.
At the moment trophic interactions are not implemented but could be included.
Multifleet and multimetier.
Processes modeled:
Catch production (relationship between effort and catch).
Short term dynamics (total effort and its allocation among metiers).
Long term dynamics (entry/exit).
Long term dynamics (T. Creeping)
Room for variables of interest that are not included in biological and fleet objects.
Dynamics can be defined for these variables.
For each stock: Stock data (catch and biological data) and abundance indices.
Observationerror can be introduced in any observable variable.
Stocks and indices can be observed at age or biomass level.
Any assessment model built in R/FLR which input data can be derived from the data simulated in the OM.
Applied stock by stock.
Instead of using an assessment model, biomass and fishing mortality, can be directly ‘observed’ from the population with or without error.
HCRs, temporal clousures, changes in catchability/selectivity….
HCRs are applied stock by stock.
Several HCRs already available.
French Deepwater Mixed Fisheries
Dorleta Garcia, Raúl Prellezo, Sonia Sanchez, Marina Santurtun
Seabream of Gulf of Cadiz
Full transcript