With the development of the ecosystem approach to f
isheries (EAF), fisheries management is
increasingly required to deal with multiple, often
conflicting objectives. In this context, the
stochastic co-viability approach has been proposed
as a useful modeling framework as it allows
for the combined representation of complex fisherie
s dynamics,...
The sustainable management of small-scale fisheries
in coral reef ecosystems constitutes a difficult objective
especially because these fisheries usually face several stringent pressures including demographic growth and climate
changes. The implications are crucial in term of food security as fish represents the major protein source for local
populations in those...
The central objective of fishery management is to ensure the sustainability and profitability of the resource base. The
importance of the fish stock's age-structure is increasingly recognized in economics and ecology. Still, current
policies predominately rely on the aggregate biomass. We carefully calibrate a detailed model on the North-East
Arctic...
Motivated by the evidence that many collapsed stocks have failed to recover despite fishing mortality has been reduced, or even when a moratorium is currently in effect, we develop a spline methodological approach to analyze the stochastic population dynamics of fish stocks at low stock levels. The aim of this...
Cameroon is a country of Central Africa, with 402 km coastline where occur intense industrial and small scale marine, multispecies/gears fishing activities. Fishing accounts for 5.2% of GDP in the primary sector and 1.7% of GDP. The Ministry of Livestock’s, Fisheries and Animal Industries is responsible of the fisheries policy...
Acknowledging that there is stochasticity in the dynamics of a fish stock, one has a situation where the fish stock can collapse even without any fishing pressure. To derive the probability of collapse, we suggest a Monte Carlo approach because it is relatively simple model and can capture complex stock...
This paper reviews New Zealand‚ orange roughly fishery management and applies a bioeconomic model to explain the seamount depletion externality by bottom trawling. The model shows that despite an upper limit on annual harvest, the potential gains in economic rent from trawling on pristine habitat, where catch rates are high,...
Fishery scientists distinguish between recruitment overfishing (i.e. suboptimally low reproduction because the spawning stock is fished down) and growth overfishing (i.e. catching fish at an inefficiently young age). We use an age-structured bio-economic model to study how important the (endogenous) recruitment is compared to the growth of individual fish under...
Globally, alterations of marine food webs due to overfishing of species at high trophic levels are leading to unpredictable changes in coastal ecosystems. In parts of the Western Indian Ocean, increasing abundances of sea urchins (particularly Tripneustes gratilla) have been observed. Sea urchins’ grazing intensity on seagrass beds is generally...
Over the past 30 years, fisheries management on the west coast of the United States has undergone a rapid evolution. Starting with very limited management and stock assessment techniques, the complexity of fishery models and size and breadth of fishery data sets have gradually increased, which has coincided with increasingly...