The Columbia River Gillnetter is the pilot of the Lower Columbia River commercial fishing industry, keeping fishermen and the public in touch with today's important issues.
The Columbia River Gillnetter is the pilot of the Lower Columbia River commercial fishing industry, keeping fishermen and the public in touch with today's important issues.
Grain is produced on upwards of 100,000 acres in the Klamath Basin including nearly 50,000 acres within the Klamath Reclamation Project. Susceptibility to late spring frosts has historically limited winter cereal production and spring cereals have accounted for the majority of production. Klamath Basin Research & Extension Center (KBREC) cereal...
Concerns were raised about loss of soil from wind erosion with the announcement in early 2010 that most Klamath Reclamation Project water users would receive a delayed and reduced rate of irrigation water during the 2010 growing season, with some areas potentially receiving no irrigation water for the entire season....
Euphorbia lagascae (Euphorbiaceae- ‘spurge family’) has been recognized as one of the more promising potential new industrial crops for the drier regions in the temperate zone
(Roseberg, 1996). In the late 1950s and early 1960s the USDA analyzed many plant species in search of novel chemical compounds. They first recognized...
Non-market valuation research has produced value estimates for over forty threatened and endangered (T&E) species, including mammals, fish, birds, and crustaceans. Increasingly Stated Preference Choice Experiments (SPCE) are utilized for valuation, as the format offers flexibility for policy analysis and may reduce certain types of response biases as compared to...
Incorporating catch or harvest rate information in repeated-choice recreation fishing demand models is challenging, since multiple sources of information may be available and detail on how harvest rates change within a season is often lacking. This paper develops a framework for evaluating which source(s) of information should be used to...
Results from vegetation management trials involving horticultural crops conducted during the past year are compiled and reported by faculty members of the Oregon Agricultural Experiment Station, the Oregon State Extension Service, and colleagues who cooperated from adjacent states along with local enterprises. This work was conducted throughout Oregon and involved...
This white paper gives an overview of the software applications used by university presses to publish digital monographs. In addition, we will look at routes taken by university presses to move from all print to some e-publishing and list the supplemental online content that is typically offered for a fee.
We introduce a model for the surplus of nonprofit organizations (NPO). We assume two types of spending schemes for an NPO. Type I is a constant spending rate and Type II is a variable rate above and below a cut-off reserve level. Under steady state, we compute and compare the...
Epidermal RNA samples from FVB/N mice treated with PAH standards and
environmental PAH mixtures were harvested and purified using Trizol extraction and
RNeasy mini prep kit purification. Epidermal RNA integrity was low (RIN mean 3.5),
indicating significant RNA degradation and the need to modify handling, collection, and
processing of skin...
It has been claimed that stimuli signaling threat are processed rapidly and
draw our attention (e.g., Fox, Russo, & Dutton, 2002). Similarly, it has been
argued that expressions of fear have a strong pull on our attention because
they signal threat (e.g., Phelps, Ling, & Carrasco, 2006; Vuilleumier &
Schwartz,...
We study the stability properties of, and the phase error present in, several higher order (in space) staggered finite difference schemes for Maxwell's equations coupled with a Debye or Lorentz polarization model. We present a novel expansion of the symbol of finite difference approximations, of arbitrary (even) order, of the...
In an effort to foster a collaborative approach to advancing the ocean energy industry, OWET convened the OWET 2010 Developersʼ Summit on September 27 and 28, 2010 in Portland, Oregon. The purpose of the Summit was to create an open dialogue among developers, utilities, and regulatory and policy leaders to...
Changes in ownership of limited entry permits by “local” residents of the region where a fishery occurs
may have significant economic and social implications for fishery-dependent regions. This paper
examines changes in local permit ownership in Alaska salmon fisheries, for which a long-term decline in
rural local permit ownership is...
One component of the Bering Sea Integrated Ecosystem Research Project
(BSIERP) is a spatial economic model that predicts changes in fishing
activity in the Bering Sea pollock fishery that may result from climate
change. Models such as the one employed here have been used in the
Bering Sea and elsewhere...
Based on the evoked set analysis, a group of factors driving knowledge and preferences about fish farmed species are investigated with three different samples. Samples were collected in Spain, into a nationwide study about knowledge and assessments about aquaculture, funded by the General Secretary of Marine Fisheries of the Spanish...
This paper discusses the use of resource assessment surveys as the basis for effective fisheries management drawing on the resource assessment survey of the Arabian Sea coast of Oman. This survey, completed in 2009, has been undertaken in the context of the primary aim of the Oman Ministry of Fisheries...
Vietnam is the peninsular country and lying in the area of monsoon tropical climate therefore has very diversify and abundant and valuable fish resources. Since long time ago the fisheries resources in natural water bodies (as in dams, rivers, lake, canals, sea) have been concerned as common property (and is...
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...
The coastal fishery in French Guyana is a challenging case study for the implementation of the ecosystem based fishery management. Although the current situation of this small scale fishery could be considered as satisfactory, the viability of the fishery can be questioned. Indeed according to demographic scenarios, the growth of...
Species within marine ecosystems are known to be interconnected. This is
a result of many factors including predation and competition for resources.
Despite this, many fisheries are still managed using a single species
framework. This paper uses cointegration analysis to quantify the
relationship between different fish species. Cointegration is a...
Tuna fisheries around the world are governed by Regional Fishery Management Organizations (RFMOs), whose membership includes both harvesting nations and nations in whose waters the targeted fish populations reside. The outcomes of the policies established by an RFMO will depend on subsequent interactions among the fleets, the fishing sites and...
Economists have long promoted fishery rationalization programs, but ITQs may fail to address the
ecological consequences of fishing. Of particular concern is that economic incentives to harvest larger
fish (due to size-dependent pricing or quota-induced discarding) can destabilize fish populations or lead to
evolutionary changes. A substantial theoretical literature in...
The credit crunch has had a dramatic effect within the seafood industry. Recent years saw a buoyant UK economy with increasing sales of chilled seafood material and a growing interest in sustainability. Credit tightening and declining consumer confidence has placed pressures on these trends. This is unlikely to be reversed...
This study estimates the demand for saltwater recreational angling trips
within the Southern California Commercial Passenger Fishing Vessel
(CPFV) fishery. The CPFV fishery provides a variety of trip types to
support recreational anglers targeting several species including, tuna,
rockfish, yellowtail, and shark. Trips vary by fishing location, by length of...
Many of the coastal counties in Florida have active artificial reef
deployment and monitoring programs. These reef systems have been
shown to be an important destination for the marine recreational boating
industry, as well as for the for-hire commercial sector (i.e., six-pack charter
vessels, guide boats, party/head boats, and dive...
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 past twenty years has seen the offshore outsourcing of post-harvest
fish processing gain unprecedented momentum. The growth in offshore
processing is a further stage in an increasingly globalised fisheries value
chain. Raw material is head and gutted, then frozen, and transported to
processing sites in Asia (especially China). The...
The spatial, multi-species nature of coral reef fisheries makes them notoriously difficult to manage. We
have developed a simulation modeling approach to examine the effect of management options on the
recreationally important tourist destination of Ningaloo Reef in Western Australia where a recreational
fishery targets Spangled Emperor (Lethrinus nebulosus). The...
This paper is based on a review and assessment of lessons from three
projects on fisheries co-management in Bangladesh: i) Community-based
fisheries management (CBFM), ii) Management of aquatic ecosystems
through community husbandry (MACH), and iii) Fourth Fisheries Project
(FFP). These co-management initiatives established 191 Community Based
Organizations (CBOs) in 179...
Due in part to limitations in data and models, fishery managers have been
hindered in their efforts to simultaneously address economic and ecological
effects of management measures. In the US, this promotes violation of
National Standard 8 of the Magnuson Stevens Fishery Conservation and
Management Act, which mandates that conservation...
The paper develops a model of recreational fisher behaviour in which
fishers maximize their individual utility by adjusting fishing time, trips,
catch and size of fish caught. It investigates the optimal behaviour or an
individual fisher with and without constraints such as bag limits. The
model is used to assess...
When we observe activities in french Guyana, we look some particular behaviours without references on modern or traditional economic sectors. It's informal behaviours creating disequilibrium. Fishering sector is a good example. We propose an examination as from two perspectives: in one side a productive logic, in the other side a...
This study analyzes supply and demand system for the mussels in the EU
markets. The results show that farmed and wild quantity of two main
species of mussels, Mytilus edulis and Mytilus galloprovincialis, have
declined in recent years due to limits of seed and space. However, a
demand system analysis...
Inspired by the export boom developing countries got involved in multiple
export earning activities. However shrimp exports have become quite
lucrative activities for many developing countries including Bangladesh.
Shrimp occupies a good chunk of our export income. In calculating the
return from shrimp exports the usual practice is the nominal...
In the economic literature on fisheries management complete information
is normally assumed. In reality fishermen have more information than the
regulatory authority. In the present paper a principal-agent approach is
applied to analyse management with a tax on fishing days under
asymmetric information about the skill of fishermen (productivity) and...
Many renewable resources, such as fish stocks, water or environmental
quality, are shared between different countries. The management of such
resources then relies on international agreements. We develop a model of a
shared renewable resource for which there is an international agreement
that determines each country's share of total extractions....
The economy of Bangladesh has benefited enormously from the rapid
development of the aquaculture production, in particular from shrimp
cultivation. In 2007-08 Bangladesh earned US$ 445.41 million from
shrimp export, which is about 4.25% of the value of total national export.
There are over 600,000 people employed directly in shrimp...
Pacific sardine (Sardinops sagax), which is a transboundary resource
targeted by Mexican, U.S. and Canadian fisheries, has exhibited extreme
decadal variability in its abundance and geographic distribution
corresponding to water temperature regime shifts within the California
Current Ecosystem. Our study develops a three-agent bioeconomic
framework that incorporates environmental effects on...
Stock assessment techniques currently used in the United States are extremely costly to implement, involve significant data requirements, and are inaccessible to all but a few stock assessment scientists. A systematic decrease in fishery yields and the designation of several species as overfished on the west coast of the United...
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...
While environmental stressors such as hypoxia (low dissolved oxygen) are perceived as a threat to the productivity
of coastal ecosystems, policy makers have little information about the economic consequences for fisheries. Prior
studies based on data aggregated at relatively large spatial (e.g.,1000s km) and temporal (e.g., annual) scales have
typically...
Conservation goals and resource use can easily conflict when externalities
exist. This is the case in the Baltic Sea with grey seal (Halichoerus grypus)
and Atlantic salmon (Salmo salar). Both of the species have been defined
as critically endangered in the late 20th century but due to conservation
schemes, harvest...
The main objective of this paper is to analyze the economics effects that
the Prestige oil spill over (2003) had on the Basque coastal fishing industry
by means of a two-stage stochastic production frontier approach. The first
stage is based on the econometric specification of a parametric production
frontier based...
Interest in ecosystem-based management or the ecosystem-based approach
to fisheries management has rapidly increased on a global basis. Most
options for ecosystem-based management have emphasized some type of
biological and natural conservation or non-use, and minimal attention has
been given to assessing the social and economic ramifications of
ecosystem-based management....
Economists studying the management of fisheries have universally assumed disturbances affecting harvest costs are unrelated to disturbances affecting biological growth. This paper gives examples of commercially valuable species that are impacted reproductively and behaviorally by a single environmental variable (e.g., temperature), leading to correlated disturbances in current marginal harvest costs...
In 2003, an industry-financed, government-administered buyback of trawl
fishing permits and vessels took place on the US West Coast, resulting in
the retirement of about one-third of the limited-entry trawl fleet. The lack
of cost data in this fishery precludes an analysis of how the buyback has
affected profitability, but...
The paper will report on the development of a new set of wealth-based
Fishery Performance Indicators (FPI) for evaluating and comparing the
worlds fisheries management systems. A wealth-based fishery management
system is one that is ecologically sustainable, socially acceptable, and
generates sustainable resource rents or profits. The Fishery Performance
Indicators...
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...
This paper develops a theoretical framework to assess resources management procedures from a sustainability
perspective, when resource dynamics is marked by uncertainty. Using stochastic viability, management procedures
are ranked according to their probability to achieve economic and ecological constraints over time. This framework
is applied to a fishery case-study, facing...
ITQ introduction has had several effects on fisheries in terms of, for
example, changes in the composition of the fishing fleet and fishing
efficiency gains. After ITQ introduction in the Tasmanian rock lobster
industry in 1998, an increasing number of fishers have become dependent
on quota leasing to catch fish...
The lessons learned from a review of thirteen bio-economic models are presented. We describe and analyze
how these models equal/ compare and differ in terms of the classification, their biological and economic
modules, the integration between modules, the indicators they provide and indicator use. We pay particular
attention to the...
Recent work in the domain of fisheries ecology has shown that major
changes occur in fish communities exploited by commercial fisheries.
Selective fishing pressure on the more highly valued components of fish
communities is amongst the key factors proposed to explain these changes.
Under de facto open access conditions, it...
A generalization of the harvesting functions and the stock updating functions in age-structured bioeconomic models is outlined. Using this generalization everything from completely uniformly distributed fish to extreme schooling is taken care of. The classical Beverton-Holt model comes out as a special case of the generalized model. Both the theoretical...
While right-based managements have often been encouraged as effective
management tools, few studies presented an empirical analysis on the
effects of those systems. This paper focuses on a special form of Territorial
Use Rights Fisheries called an income pooling system, and examines the
effects of the system empirically. Income pooling...
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...
Upon request by the European Inland Fisheries Advisory Commission
(EIFAC), group of prominent economists and other social scientist were
assembled to create a set of guidelines for assessing socio-economic
benefits of the European inland recreational fisheries. A wide range of
international interest groups and academics were included in this process...
Fishers from coastal communities have been facing hazards of different
nature. Those stressors plus high fishing pressure have contributed to
resources deterioration, which in turn affects peoples livelihood, creating a
vicious circle. In order to understand this vicious circle and to explore how
this could be turned around, in this...
Eritreas Coastal Marine and Island area covers more than 121,000km2, include over 350 offshore islands and 1,350km of coastline (18% of the Red Sea continental coastline) not including the islands. The total coastal mainland population is 73,000, and only ten out of all the islands are inhabited with a total...
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...
Growth overfishing squanders large parts of the potential rents in fisheries. Many of today’s fisheries are
characterized by a severely truncated age-distribution, which in addition may have irreversible ecological
consequences. Nevertheless, the implications of age-differentiated harvesting for management have
received surprisingly little attention in the literature. In the present paper,...
Aquaculture is one of the most dynamic food-producing subsectors
worldwide. In the Philippines, shrimp monoculture started in the 1980s,
only to collapse less than a decade later due to disease. More recently,
extensive polyculture of fish, shrimp and mud crabs has developed. The
objective of this paper is to analyze...
The aquaculture sector is uniquely placed to complement production from the stagnating capture fisheries sector and it has advantages in terms of controllable production characteristics. However, aquaculture poses undeniable economic, environmental and social challenges that may be poorly evaluated or inadequately addressed within current policy frameworks. In such cases, the...
Environmental resource values are often obtainable only through stated
preference or hypothetical surveys because other nonmarket valuation
methods only account for part of the resource value or are unsuitable.
Despite the recent popularity and many advances in discrete choice
techniques for nonmarket valuation, the implications of questionnaire
structure, namely framing...
This paper investigates the welfare effects of random closures in a fishery
operating under open access. At each point in time, a fishery is facing the
probability of an extreme event that impairs fishing activities but has no
direct impact on the fish population. Examples include massive blooms of
dinoflagellates...
Tuna farming industry of Japan has achieved complete culture and currently tries to seize the opportunity to materialize the industrial mass production of the artificial seed. Japan was only 3,000 tons (8%) among 37,000 tons of 2007, which was the peak of world production of cultured tuna. However in 2008,...
Existing research on the effectiveness of marine protected areas narrowly focuses on developing sets of management
indicators tied to outcomes described in management plans or on the achievement of a single objective such as an
increase in the size or number of older, more fecund female fish in a protected...
Although diversification of producing activities and migration abilities are often supposed to reduce vulnerabilities of the rural households, it should not be considered as a general rule. In the Central Delta of the Niger River in Mali, fishers are massively involved in rice farming as secondary activity and many of...
The paper reviews the management and bioeconomic modeling of the Southern Bluefin Tuna
stock. It describes two studies using simultaneous, non-cooperative, three player games to predict
revenue and stock outcomes generated by a deterministic, discrete, age-structured model of the
SBT population. Two versions of the model, corresponding to biological and...
This article gives insights on the complex balance between coalitions structure,
resource state or dynamics and agents’ heterogeneity to avoid bio-economic
collapses. A model bringing together coalition games and a viability approach
is proposed to focus on the compatibility between bio-economic constraints and
an exploited common stock dynamics. It is...
Since 1999, the scallop fisheries have been granted access to closed areas on Georges Bank, and the
access programs have been managed through individual vessel quotas for scallops, and a common-pool
total allowable catch (TAC) for yellowtail flounder bycatch. The scallop resource is neither overfished
and nor is overfishing occurring,...
The north coast of Java Sea is home to thousands of small-scale fishers fishing for small pelagic fish. The
small pelagic fisheries have been the main economic and social activities for coastal communities where
other alternatives are limited. The fisheries have been experiencing turbulent states during the last thirty
years...