The UN Law of the Sea of 1982 assigned rights and responsibilities to the
fishery resources within 200 nautical miles of the coast (i.e.,the Exclusive
Economic Zones: EEZs) to the adjacent maritime countries. A key
responsibility is the requirement that these countries manage their marine
living resources sustainably through time...
The Mexican Oyster fishery in the Gulf of Mexico annually produces only
50,000 MT, 95% of Mexico oyster production. Oyster production has
fallen drastically in most coastal lagoons, this decline has been attributed to
factors as overfishing, mismanagement of natural oyster beds,
environmental degradation and lagoons pollution. This work proposes...
If the study of the fisheries dynamics increasingly seeks to take into
account the evolution of fishing fleets, the main mechanisms which govern
their evolution at the local, national or international levels, are often not
studied at all, or only partially studied. This applies in particular to vessel
entry and...
Australia’s western rock lobster fishery is its most valuable and hence from a biological perspective most tightly managed major commercial fishery, yet it has been beset by problems of miniscule recruitment over the past 3 years. This coming year 2010-11 is little better. It was the joint first Marine Stewardship...
This paper examines the viability of the management of a transboundary resource, the Bay of Biscay anchovy (Engraulis encrasicolus L.). A deterministic model is used to simulate the anchovy dynamics, with the fish stock consisting of two age groups, “young" and “old", while recruitment follows a Beverton Holt pattern. Two...
Understanding the complexities of ecosystems is difficult enough, but when the human dimension is added to the inherent uncertainty and risk in fisheries management, the actual versus expected results move from the counter-intuitive to the paradoxical. Without an adequate understanding of the interrelationships between ecosystem components, including the human dimension,...
Considerable attention has been applied to the development of models explaining how fish stocks change over space
and time, from relatively simple stock-recruitment relationships to ecosystem models with a complex food web
structure. However, in many case studies fishing effort is assumed to be exogenous and even in dynamic models...
A major simplification in bioeconomic models is that the model parameters
and functional forms are assumed known. In fisheries, the failure to capture
model uncertainty can easily cause overconfidence in model outputs and
resultant policy recommendations. Although fisheries modelers regularly
assume rather complete knowledge of the systems they study, in...
Fisheries economics theory suggests that weak fishery management
institutions, such as an open access regime, provide the motivation for
fishers to act as if they have infinite discount rates. This theory has serious
implications for the management of small-scale reef based fisheries in
developing countries, many of which are open...
Many of Australias most valuable fisheries are not appreciated as such and
so have miniscule management budgets. This situation is considered to be
common elsewhere too.
The paper argues this situation needs to be addressed from both scientific
and community perspectives, but is ultimately doomed to fail unless the
political...
The motivation of this paper is to detail the application of Markov chains in
simulating fleet dynamics in Australia's Northern Prawn Fishery (NPF).
The Markov chains are enhanced through the use of the multinomial logit
(MNL) and Seemingly Unrelated Regressions (SUR) models to explain
transition probabilities. The terms MNL Markov...
The push for ecosystem based management has opened up not only for including more of the natural
systems when managing fish resources, but also a broader perspective on the human systems, and the
diverse activities in the sea. This is reflected for instance in the EU Maritime Policy where fisheries...
Technological switching and re-switching has been the subject of debates within economics. Under
assumptions of malleable capital in economies with multiple sectors, the wage-rent envelope can show
multiple re-switching. The interest of technological change and switching behavior for fisheries
economists and managers stems from the fact that the control of...
Lobster (Homarus americanus) ranks first in Canada’s fisheries, but Quebec lobster represents only 6% of eastern Canada landings. During the peak of the fishing season in Quebec as elsewhere, supply is at its maximum and price is the lowest. For this reason, there has been considerable interest in Quebec in...
We define the notion of sustainable yields for ecosystem, with particular
emphasis on long-run consistency between ecological and economic conflicting
objectives. We provide a way to compute sustainable yields by means of
a viability analysis of generic ecosystem models with harvesting. We apply
our approach to a Lotka–Volterra model of...
In Africa, the artisanal fishing plays a crucial role in the economy and
nutrition of populations. She participates in the equilibrium of the balance
of payments, and generates significant jobs. On the coast of Senegal in
particular, artisanal fisheries ranked first in economic activities. It carries
more than 1.8% of...
According to international law, straddling fish stocks should be managed
co-operatively through Regional Fisheries Management Organizations
(RFMOs). This paper analyzes the stability and success of these
organizations through a game in partition function form based on the
classical Gordon-Schaefer bio-economic model. Results show that the
larger the number of fishing...
An international symposium devoted to Research and small-scale fisheries (Durand, Lemoalle, Weber,
1991) in Montpellier (France) in 1989 came from increasing evidence that “the complexity of small scale
fisheries calls for applying knowledge from many fields in combined studies that can take advantage of a
whole range of information”. Has...
This paper investigates interactions between recreational and commercial fisheries. It introduces the idea of a protected area for recreational fisheries, as a way to reduce conflicts between the two sectors and to preserve the natural resource. It is demonstrated that without a protected area for recreational fisheries, open access may...