Biologists have criticized traditional biomass models in fishery economics for being oversimplified. Biological stock assessment models are more sophisticated with regard to biological content, but rarely account for economic objectives. Recently, age-structured models of fish stocks have increasingly been used in fisheries economics, but applications have so far mainly been...
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...
Using renewable resources can provide society with (i) resource rent, (ii) consumer surplus and (iii) worker surplus in resource harvesting. In a dynamic analysis we show that privatization increases the present value of consumer surplus and worker surplus if harvesting productivity does not depend on the resource stock. If it...
By 1992, the Canadian cod populations collapsed and
a moratorium on fishing was declared, which
remains in place until today. Ecologists suspect that the marine ecosystem at the Canadian east coast
has
shifted towards a new regime, where cod stocks remain at a low level while other species biomass levels,...
The main instrument used in fishery management is the total allowable catch (TAC). Fishery management often fails because TACs are set too high and do not sufficiently restrict fisheries. The question we address in this paper is why do decision makers choose inefficiently high TACs? Our approach is to model...
Different user groups have different stakes in fisheries. The societal challenge is that, exploiting the same fish stock, or ecologically interacting stocks, recreational and customary fishermen interact with a continuum of commercial fishermen, ranging from very small-scale and part-time artisanal fishermen to large-scale fishing firms. In this paper we develop...
Establishing an effective management of former open access fisheries can
increase resource rents from close to zero to numbers as high as several
hundred Mio $ p.a., as it has been the the case in Iceland's cod fishery.
Whenever the corresponding harvesting rights are given out free of charge
as...
The success of fishery management ultimately depends on the approach of implementation. Past fishery management has relied largely on technical regulations. Examples for such command-and-control measures include detailed gear prescriptions, restrictions on the days-at-sea spent fishing and vessel capacity, and minimum landing sizes. Resource economists have argued in favor of...
Based on fieldwork on the occupational choice and the incomes of fishermen at Chilika lagoon, India, we built an overlapping generations model of a small open economy with access to a renewable common pool resource to show how the share of the workforce in the resource sector, the average income...
To achieve sustainable fisheries, ecosystem-based fisheries management
yields increasing attention. However, so far mainly single-species models
are used to develop management advice, not accounting for species
interaction. In particular many traditional fisheries economic models have
been criticized by biologists, especially if results were gained by rather
simple biomass models. Therefore,...