The present study uses normalized profit function and adaptive expectation approaches to analyze U.S. catfish farm supply. Empirical estimations give short-run supply elasticity of 0.25 and 0.26 and long-run supply elasticity of 0.47 and 2.1 in each of the two approaches, respectively. Technological improvement is attributed for only 9.8% out...
The study examines economic efficiency of aquaculture production in Edo State. The data for the analysis were obtained from the fish farmers through the administration of structured questionnaire, using multistage sampling technique and leading to the selection of 100 respondents. Data were analyzed, using stochastic frontier production function as in...
Fisheries constitute a major productive sector in Latin America and the Caribbean. This sector generates income, provides employment, and makes a significant contribution to food security and the generation of foreign exchange. With most fishery resources fully exploited or depleted, opportunities for fishery development lie primarily in restoring depleted
stocks...
The paper is the first attempt to explore the ecological and economic impacts of genetic interaction between farmed and wild salmon over generations. An age- and stage-structured bioeconomic model is developed. The biological part of the model includes age-specific life history traits such as survival rate, fecundity, spawning success for...
The recovery of fish stocks is in principle an investment decision weighing up short term losses against
future gains. In the Common Fisheries Policy (CFP) of the EU long term management or recovery plans
are a main instrument. One of the basic aims is to move from a short term...
This study explores the optimal harvesting time in a size-heterogeneous population dynamics. The model includes the effect of population density in both the mortality rate and individual growth. An application to specific conditions of shrimp culture in Mexico is presented. The optimal harvesting rule is numerically found for different economic...
Assessing distribution of the expected bio-economic impacts of
management measures between fleet segments is a main issue for decision
making in fisheries management. This requires as a first step a good
description of the system and of the interactions between fleets through
stocks. Making this assessment operational also needs flexible...
The herring stocks in the Northeast Atlantic were nearly fished to
extinction in the 1970s. This collapse is usually attributed to advances in
fishing technology. The impact of productivity shocks depends critically on
how sensitive the fish catch is to the size of the stock. If the catch per unit...
In the globalizing era, world trade of fishery resources has sharply
increased. Because capture fisheries are hard to be managed, growing
opportunity for fishery trade may cause the overexploitation of world
fishery resources. For instance, the theoretical model developed by
Takarada et al (2009, mimeograph) implies that fish stocks may...
Marine scientists and stakeholders are increasingly advocating ecosystembased
fishery management (EBFM). However, the way to operationalize
such EBFM remains controversial. The viability approach can be a relevant
modelling framework for EBFM as it accounts for dynamic complexities,
uncertainties, risks and sustainability objectives balancing ecological,
economic and social dimensions together with...