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Verweise |
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Autor |
Coppola, S. R.; Fischer, W.; Garibaldi, L.; Scialabba, N.; Carpenter, K. E. |
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Titel |
Global species database for fishery purposes. User's manual |
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1994 |
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fishery-data; data-collections; fishery-resources; commercial-species; information-retrieval; manuals-; FAO-; books-, Speciesdab- |
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Zusammenfassung  |
The SPECIESDAB manual describes the use of software created to assist in the retrieval of information relevant to species of interest to fisheries. Data on scientific and vernacular nomenclature, biology, fishing gears, and geographical distribution are included for species that belong to certain marine resource groups. This information is derived from the FAO Fisheries Department species identification and data programme publications and the software is designed to permit continual updating as new publications on other resource groups appear. To date, some 25 major resource groups are covered. Among these are shrimps, lobsters, cephalopods, sharks, marine turtles, and 20 families of bony fishes, which together form a significant component of world fisheries. The program uses a menu system to provide users easy access to the information contained in SPECIESDAB. The manual includes extensive examples of how to use the software. On-line help is also available. Extensive query and reporting capabilities are provided to access data on valid scientific names, synonyms, national and local names, official FAO trilingual names, size, habitat, behaviour, kinds of gear utilized in the fishery, and level of interest to fisheries. Geographical information may be obtained by species, by country, or by fishing area. Data may be extracted for either a single resource group or for all resource groups in combination. Furthermore, the user interested in using only the data of species occurring in a particular geographical area can create, with the Regional option, a sub-database including only the species found in the countries selected. This option can be useful for regional bodies and working groups. SPECIESDAB includes a bibliographic reference system, which may be updated by the user as well as utilities for exporting data. |
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316 |
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Lepetit, M.; Loranchet, S.; Gillet, P.; Marion, J. M. |
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Titel |
Un Logiciel De Traitement Des Histogrammes De Structure De Population Par La M+Thode Des Differences Logarithmiques De Bhattachary |
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Jahr |
1991 |
Publikation |
Vie Milieu |
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41 |
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2/3 |
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127-131 |
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Population, statistik, programm, pascal, lÄngenfrequenz, methode |
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Zusammenfassung |
The software “BHATTA”, achieved in Turbo Pascal on IBM PC makes possible histogram analysis for population structure. The base of the study is an analysis of population dynamics from histograms of size frequency. The program “BHATTA”, made from the method of logarithmic differences of Bhattacharya, cuts the histograms in order to display Gaussian components and to estimate the parameters: number (size of sample), mean and standard deviation for each generation or cohort to determine growth curves for each cohort. |
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400 |
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2204 |
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Sekine, M.; Nakanishi, H.; Ukita, M.; Murakami, S. |
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Titel |
A shallow-sea ecological model using an object-oriented programming language |
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Jahr |
1991 |
Publikation |
ECOL. MODEL. |
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57 |
Ausgabe |
3-4 |
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Ökosystem, modell, oop, methode, theorie |
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Zusammenfassung |
The purpose of this study is to construct a model that can predict the impact on fisheries caused by coastal development activities. To accomplish this, many species of fish must be incorporated in the model, because each type of fish has a different value as a fishery resource and a different behavior for the same impact. In addition the effect of fish swimming must be considered because even when the total resource amount of fish does not change, fish may still disappear from the object area. These factors make the model structure complicated. Meanwhile, a new concept called “object oriented programming” (OOP) is attracting the attention of modellers. In this paper, we have constructed a model called the “shallow-sea ecological model” (SSEM), by using Smalltalk, which is representative of the OOP language. This showed that the fishing ground environment are expressed very flexibly and plainly by Smalltalk. |
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nein |
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405 |
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2209 |
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Autor |
Sparre, P. J. |
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Titel |
The data requirements for basic fisheries bio-economics |
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1994 |
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fishery-economics; stock-assessment; economic-feasibility |
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The paper discusses the links between fish stock assessment and economics of fisheries, as perceived by a fisheries biologist. It focuses on the type and format of data required from the biological side as well as the economic side, to merge the biological and the economic methodologies into a bio-economic methodology. The biological methodology in question derives from the analytical approach, which operates with cohorts and size distributions of several stocks exploited by several fleets fishing on several fishing grounds. The economic methodology comprises costs and earnings analysis of the harvesting and the processing sectors, and computations of indicators for the economic performance of the sub-sectors. The paper is based on applications of bio-economics to tropical fisheries (targeting at shrimps). The methodology has been applied during a series of workshops and seminars organized by the Fisheries Department of FA0. The paper addresses both biologists and economists. |
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1593 |
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Gerdeaux, D. |
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Titel |
(Review of methods of estimating population size based on removal data computer program of size estimation with the Carle and Strub method) |
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Zeitschrift, Artikel |
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Jahr |
1987 |
Publikation |
Bull. Fr. Peche Piscic |
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304 |
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13-21 |
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Population, statistik, methode, listing, basic, vergleich, modell, fisch |
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Zusammenfassung |
The paper describes methods of estimating population size based on survey removal data. The Zippin maximum likelihood model is presented with the possibility with microcomputer. The Carle and Strub method is considered most convenient and a microcomputer program is published. |
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Rufnummer |
195 |
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2084 |
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Krivan, V.; Seda, J. |
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Titel |
Application of a guaranteed regression model to trophic interaction in an aquatic system |
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Jahr |
1989 |
Publikation |
ECOL. MODEL. |
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49 |
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1-2 |
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Ökosystem, modell, interaktion, trend, fisch, statistik |
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The method of guaranteed estimation is used to estimate the unknown parameters of two nonlinear regression models. The first describes the relations between the body size structure of zooplankton and the biomass of planktivorous fish. The second estimates time-lag between the dynamics of cladoceran egg production and dynamics of phytoplankton. |
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422 |
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2226 |
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Eckmann, Reiner; Gaedke, Ursula; Wetzlar, Hans Johst |
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Titel |
Effects of Climatic and Density-Dependent Factors on Year-Class Strength of Coregonus lavaretus in Lake Constance |
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Zeitschrift, Artikel |
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1988 |
Publikation |
Can. J. Fish. Aquat. Sci. |
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45 |
Ausgabe |
6 |
Seiten |
1088-1093 |
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Fischerei, zeitreihe, modell, statistik |
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Zusammenfassung |
The influences of density-dependent and density-independent factors on year-class strength (YCS) of Corogonus lavaretus in Lake Constance were studied by multiple linear regression analyses for the period from 1962 to 1982. Meteorological conditions that lead to early thermal stratification of the lake in April are of prime importance for YCS and account for 41% of the total YCS variance. Zooplankton concentration during spring has no significant influence on YCS. The extensive stocking program on the lake (50-200 million larvae stocked per year) significantly supports YCS, but this relationship becomes apparent only after the influence of meteorological conditions are removed from the data. |
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419 |
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2223 |
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Akamine, T. |
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Titel |
Expansion of growth curves using a periodic function and BASIC programs by Marquardt's method |
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1986 |
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Bull. Japan Sea Reg. Fish. Res. Lab. Nissuiken Hokoku |
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36 |
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77-107 |
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Wachstum, modell, methode, listing, basic, fischerei, statistik, algorithmus |
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The growth curves of von Bertalanffy, logistic and Gompertz models were expanded using a periodic function, f (t + 1) = f (t). Each model was expanded into l = l infinity (1-exph sub(1)), l = l infinity /(1 + exph sub(1)) and l = l infinity exp(-exph sub(1)) where h sub(1) = -K(F(t)-F(t sub(0))), F' = f, f = (1 + a)/2 + (1-a)/2 multiplied by cos 2 pi (t-t sub(1)) : a less than or equal to f less than or equal to 1. BASIC programs for each model were written by Marquardt's method. The following subjects were also considered : an expansion into another type, a parameter-error analysis, a comparison with the original model and with Walford's graphical method, and a calculation to determine the extreme points of the growth rate. This expansion of the growth curves is useful and the programs are easily applied to other curves. |
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207 |
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2095 |
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Autor |
Landrum, J. L. |
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Titel |
Simplification methods for the World Vector Shoreline |
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1989 |
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mapping-; computer-programmes; data-processing; vectors-; automated-cartography; algorithms- |
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Zusammenfassung |
The fractal nature of the coastline makes it desirable to sample the World Vector Shoreline (WVS) data base in a manner related to the map scale at which it will be displayed. A survey of US Navy users has determined that several resolutions of the WVS are required. This report shows the relationship among vector data-base resolution, display device resolution, and map scale, then presents three simplification algorithms. These algorithms provide means of reducing the data-base resolution to that which is appropriate for a particular map scale and display device resolution. The discussion is supplemented with a series of maps illustrating the output of the simplification algorithms at several map scales. |
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Naval Ocean Research and Development Activity, NSTL Station, MS (USA) |
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REP.-U.S.-NAV.-OCEAN-RES.-DEV.-ACTIVITY. 1989. 22 pp |
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955 |
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Autor |
Ragen, T. J. |
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Titel |
The estimation of theoretical population levels for natural populations |
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1991 |
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environmental-conditions; biological-production; marine-mammals; marine-fish; population-dynamics; size-distribution; computer-programs; simulations-; frequency-analysis; migratory-species; Callorhinus-ursinus; Atractoscion-nobilis; Seriola-lalandei; Stereolepis-gigas; INE,-USA,-California; ISW,-USA,-Alaska,-St.-Paul-Island, carrying-capacity |
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The focus of this dissertation was the estimation of theoretical reference levels such as K, the environmental carrying capacity, and MNPL, the maximum net productivity level, for three fishes off Southern California and for the northern fur seal (Callorhinus ursinus) population of St. Paul Island, Alaska. The estimation techniques were based on computer modeling of historical population trends. The assessment of these theoretical reference levels for nature populations is fundamentally important to the development and testing of concepts in theoretical ecology and population dynamics. In the first study, maximum-likelihood estimates of pre-exploitation biomass were made for the white seabass (Atractoscion nobilis) and the yellowtail (Seriola lalandei) by assuming that development of corresponding commercial fisheries led to a shift in size distributions of these fishes, as indicated by records of the Avalon Tuna Club, Santa Catalina Island, California. Pre-exploitation biomass for Southern California populations of both these fishes was estimated to be about 20,000 tons. The pre-exploitation biomass of the giant sea bass (Stereolepis gigas) was estimated to be 1300 tons. Due to insufficient natural history information, this estimate was based on commercial catch records only. In the second study, estimates of theoretical reference levels for the northern fur seal population of St. Paul Island were based on computer simulations of pup production from 1912 to 1970, repetitive simulations were used to construct frequency distributions of estimates for MNPL, K, the number of pups born at MNPL and K, and the ratio MNPL/K. These distributions serve as a measure of the confidence that can be placed in single estimates of reference levels, and thereby provide a general context within which these reference levels can be evaluated. The final study of this dissertation investigated the pelagic migration of northern fur seal pups. Results indicated that initial migration paths for these pups are more widely dispersed than previously assumed. This information contributes to the understanding of northern fur seal life histories. A fuller understanding of life history information will eventually facilitate more accurate modeling of northern fur seal population dynamics. (DBO) |
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1311 |
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