Keywords: Steelhead; Oncorhyncus mykiss; Willapa Bay, Washington; Columbia River, Oregon; Cape Meares, Oregon; otoliths; offshore; otolith analysis; ocean residence; adipose clip; freshwater residence; life history
Keywords: Chinook Salmon; Oncorhynchus tshawytsha; genetics; Sacramento River, California; San Joaquin River, California; CRY; BMAL; stock assessment; Fall run; Central Valley, California; Winter run; microsatellite
Keywords: tree ring chronology; climate; forest development; dendrochronology; otolith time series; Sebastes diploproa; Sebastes pinniger; Douglas Fir; Pseudotsuga menziesii
Abstract: In this project, our goal is to design a flipping algorithm for computing the Voronoi diagram of simple polygons. As preparation towards designing a flipping algorithm, we re-implemented the ear cutting algorithm of using a standard geometric library COAL. This new Implementation is compatible with COAL, We have designed...
With the rapid development of Internet technology and popularity of Web solutions, the Internet has become a major means for collecting information. The Weatherlnfo system is conceived and developed to provide weather data for end users in tabular and graphic formats over the Internet. In order to make data retrieval...
Spreadsheet programming is ubiquitous in businesses today. Spreadsheets are frequently created by end users with little or no programming experience. Unfortunately spreadsheets often contain errors. For example, 54 field audits of spreadsheets showed that 91 % of the spreadsheets contained errors [ 15]. Our research is aimed at bringing the...
We developed a tool that migrates the database schema and the data from one database to another. As DBMSs store the same data by using slightly different data types, one cannot simply copy all the tables and data from the source DBMS to the target DBMS. When our tool, db2db,...
Motivated by a real-world problem, we study a novel setting for budgeted optimization where the goal is to optimize an unknown function f(x) given a budget. In our setting, it is not practical to request samples of f(x) at precise input values due to the formidable cost of experimental setup...
A plant community classification was developed describing the comprehensive variation of oak vegetation currently occupying the Willamette Valley Ecoregion of western Oregon. Multivariate statistical analyses were used to classify field collected floristic and habitat data. Field sampling targeted minimally managed, homogenous vegetation stands with a significant oak component occupying at...
Cet article s'intéresse au système de commercialisation des produits halieutiques en Guinée, La commercialisation des produits halieutiques fait actuellement l'objet d'une attention toute particulière des autorités guinéennes dans le cadre de la politique de développement du secteur des pèches. Le souci du gouvernement de disposer d'éléments d'analyse permettant de mener...
There is great concern at present that fish stocks are being depleted by over-fishing. Part of the problem of over-fishing is caused by the common property nature of the fishery resources. In particular, high seas fishery resources, such as highly migratory fish stocks (HMFS) and straddling fish stocks, suffer from...
The arrival in the 1980s of cultured shrimp has induced large changes on the World shrimp market. In this new environment, the French Guyana fishery production now competes strongly with some of these farm-produced shrimp. Consequently, this fishery has experienced serious export problems during the last decade. This paper is...
Certaines populations marines, de par leur capacité à réaliser des déplacements de grande envergure, marquent leur distribution spatiale d'une forte variabilité; Celle ci s'inscrit souvent dans un cycle saisonnier avec une reproductibilité interannuelle. Ces déplacements sont liés soit à une migration saisonnière entre plusieurs aires, soit à une concentration saisonnière...
Although widely accepted, management systems that directly restrict catch or effort are neither efficient nor desirable for many fisheries, and have failed to conserve fishery stocks in many cases. Fisheries scientists have suggested that closing part of the fishery with marine reserves may sustain or increase harvest. These marine reserves...
In considering fisheries regulation in the next decade, I make a concluding point that may become a major theme. This is that individual permanent catch quotas of a regulator-determined TAC are only a stage in the development of management from licensing to private rights (Scott 1989). The condition of open...
The main research question in this paper is: What impacts do the perceived structural changes in (1) consumer demand for fresh quality and (2) mobility (trade) barriers in distribution have on the market and trade patterns for fresh packed consumer fish products? A representative sample of UK and French seafood...
Japan is both the largest producer and consumer of tuna in the world. However, Taiwan has been a major exporter to Japan of Thunnus albacares and Thunnus obesus recently. For example, the market shares of Taiwan's supply are 20% for T. albacares, and 44% for T. obesus in 1992. Hence,...
Japan is the number 1 country in the world in terms of tuna harvest[1]. For example, it started from about 294,961 tons in 1975, then reached its peak at 371,103 tons in 1985. Although the harvest declined since 1985, it bounced back for the recent years and reached 343,611 tons...
A serious impediment blocks advancement of individual transferable quota (ITQ) policy in the United States, particularly in North Pacific fisheries being considered for ITQ management. The traditional ITQ design, that allocates rights to only the harvesting sector, unintentionally expropriates wealth/property interests from the co-dependent-processing sector. This regulatory expropriation is a...
As a Member State of the European Community (EC), the United Kingdom's marine capture fisheries must be managed within the framework of the Community's common fisheries policy (see Box 1). Since 1983 this has included a system of annual total allowable catches (TACs) for most commercially important stocks within the...
An ITQ scheme has been shown to create a quota induced incentive for discarding of fish in excess of what is socially optimal. This finding is corroborated by empirical evidence in several ITQ managed fisheries. The incentive for discarding, over and above those expected in an unmanaged or input controlled...
Catering establishments in Finland are very heterogeneous (restaurants, hotels, personnel canteens, hospitals, schools etc.). These kitchens annually prepare over 600 million meals with the total number of kitchens at over 20,000. The objective of this study was to estimate quantity and frequency of fish consumption within the Finnish catering market....
La pêche côtière au Maroc a connu un essor remarquable ces dernières décennies, poussant là où les ports se créent et se développent sur la côte atlantique. D'abord concentrée a proximité du port de SAF où les débarquements ne dépassaient pas 60.000 tonnes dans les années quarante, l'activité de la...
This paper describes a desk study of small pelagic utilization in Asia. Drawing on regional data and country case studies - it seeks to chart significant trends in the sector and identify issues for further research. Possible responses to under-utilization include increasing fishing intensity, exploitation of under/unexploited stocks reduction in...
This paper relates fish market and product development to consumer habits, perceptions, income, and other socio-economic factors through descriptive statistics and logic model analysis. The study collects and analyzes information needed for guiding public and private decisions in domestic fish market development. A 1994 survey interviewed a sample of 130...
The United Kingdom is the world's second largest producer of farmed Atlantic salmon. It also represents one of the larger markets for the product. During the 1980s, there was rapid growth in the industry stimulated by high market prices and major technological advances. While there was a substantial increase in...
En dépit de sa production halieutique qui occupe la première place dans le monde arabe et africain, le Maroc connaît une consommation de poisson de 7.5 Kg/personne/an, largement inférieure à la moyenne mondiale qui est voisine de 13 Kg/personne/an. Cette consommation est inégalement répartie. Généralement moyenne à forte, en bordure...
La filière des produits aquatiques en France subit des mutations importantes, sous la triple poussée d'une contrainte croissante sur la ressource, de l’internationalisation des marchés, et de la modernisation de la distribution. Son évolution présente des similitudes avec celles de certaines filières des produits animaux à moments donnés de leur...
Dans un marché de libre concurrence, certains paramètres tels que la saison de pêche et la taille des produits halieutiques ont une très grande importance sur la fixation des prix et la volonté à payer du consommateur. Afin de valider ces données, des échantillons de palourdes de l'Atlantique (Spisula solidissima),...
The aim of this paper is to specify the arising preferences within a theory of demand for seafood products through a socio-economic quantitative analysis. The relevance of standard economic variables is discussed by introducing additional socio-demographical variables in a multivariate statistical analysis. The position of seafood among other food products...
La lagune de Nador se caractérise par un écosystème semi-fermé, en communication avec la mer par une étroite passe. Cet écosystème est sous l'influence de plusieurs facteurs externes tels que l'ensoleillement, l'apport en eau douce, les eaux de ruissellement, le lessivage des champs agricoles et les eaux usées urbaines. L'influence...
Gear technologists have, in recent years, developed rigid sorting grids, Sort-X, in bottom trawls, to improve the size selectivity of this type of gear. Experiments with the Sort-X system in the aft sections of trawls were carried out aboard Norwegian and Russian trawlers along the coast of Northern Norway and...
The development of several sub-fields of general economics, including those of bounded rationality, institutional economics and the evolutionary economics, has expanded the scope and intensity of the dialogue both within economics, as well as between economists and other scientists. One of the more important preoccupations of early evolutionary economics was...
Le projet «système d’information géographique pour les pêcheries en Afrique de l’Ouest » a pour objectif de promouvoir l’utilisation des systèmes d’information géographique comme outil d’aide à la décision en matière d’aménagement des pêcheries. Un rappel préliminaire des critères caractérisant un produit d’aide à la décision (accessibilité technique, disponibilité en...
A partir des pêches plane ioniques effectuées dans les eaux côtières du littoral atlantique de la région d'EI Jadida de Décembre 1994 à Décembre 1995. nous avons étudié le cycle annuel des espèces de Copépodes libres de la région. Ces derniers constituent le groupe le plus important de poilu de...
The artisanal fishery in Senegal is characterized by composite biological, technological economical dynamics in interaction. A computer model of the exploitation is presented to study the relationships existing between resources, production, trading, consumption (dynamic approach). The model is developed using a systemic approach. The computer transcription utilizes multi-agent formalism (artificial...
Des comptes d'exploitation par type d'exploitation de la flottille aux céphalopodes sont utilisés dans la modélisation bio-économique qui met a notre disposition des éléments d’appréciations plus centres sur des variables économiques. Ces éléments servent a des taux d'exploitation optimaux selon les critères juges pertinents par 1'adniinistration (revenus. Emploi, etc.) et...
The last three years RIVO-DLO and LEI-DLO have developed a bio-economic simulation model for the Dutch beam trawl fishery. At the VII th IIFET conference in Taipei (1994, Taiwan) some preliminary results were presented and at the 4th EAFE bio-economic modeling workshop in Edinburgh (1995, United Kingdom) the final model...
Structural time series methods are applied to modeling endogenous fishing effort in the German North Sea shrimp fishery. The effects on fishing effort of shrimp price, catch per unit effort and environmental variation are examined. Preliminary results suggest that fishing firms do not respond much to price changes but they...
Applied research is often motivated by the economic benefits it will give rise to. These benefits are due to either improved production techniques or new products. The realisation of these objectives depends much on the assessment of different research alternatives and allocation of resources between them. Also within aquaculture research...
The natural market selection of the Italian aquaculture farms, mainly happened in the years' 90, need to determine and check their strength and weakness points: this will be capable either to modulate the managerial strategies in function of market trend and set up entry barriers. The study has been carried...
In developed country markets, the consideration of consumer wants has not been prominent hitherto in aquaculture production decisions. Like capture fisheries aquaculture has been product driven. This supply-side focus reflects an emphasis upon technical solutions to the production and capacity problems of high unit value (HUV) species culture. Whilst this...
In this paper, we study the short run price dynamics of imported fresh, farmed Atlantic and Pacific salmon on US regional markets. An Error Correction framework is used to specify a short run model. The results show a substitute relationship among the different salmon species in that an adjustment process...
L'exploitation des coquillages dans la lagune de Moulay Bousseiham, avec essentiellement sur la palourde européenne {Ruditapes decussatus), est une activité artisanale et manuelle pratiquée de deux façons: la pêche "à vue" (ou la pêche "à pied") est la plus courante, elle est pratiquée par un grand nombre de riverains de...
Sustainable aquaculture can be achieved when risk and uncertainly are incorporated in the analysis of the activity. This paper presents a precautionary approach to the feasibility analysis of a project for a commercial hatchery, applying decision theory. Two production scenarios were assessed, continuous and periodic, the later a combination of...