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Verweise |
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Autor |
Shoesmith, E. |
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Titel  |
A comparison of methods for estimating mean fecundity |
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Zeitschrift, Artikel |
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Jahr |
1990 |
Publikation |
J. FISH BIOL. |
Kurztitel der Zeitschrift |
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36 |
Ausgabe |
1 |
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Schlüsselwörter |
LÄngenfrequenz, normalverteilung, methode, theorie, mathematik, vergleich, statistik |
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Zusammenfassung |
This paper is concerned with certain computational aspects of estimating the mean fecundity of a single age-class of a population of fish. Four computational methods for estimating mean fecundity are compared by Monte Carlo simulation. One of the four methods is the simple expedient of estimating fecundity at sample mean length, a method known to be downwardly biased. The Monte Carlo study shows that the other three methods reduce bias and provide worthwhile efficiency gains. For small samples, the most efficient of the four methods is a “bias adjustment”, proposed here, that uses easily calculated sample statistics. For large samples, a numerical integration method has the highest efficiency. The fourth method, a “direct summation” procedure which can be done easily in many statistical or spreadsheet programs, performs well for all sample sizes. |
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Rufnummer |
212 |
Signatur |
2100 |
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Autor |
Salojärvi, K.; Auvinen, H. |
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Titel |
A computer program for classifying sympatric whitefish (Coregonus lavaretus) stocks |
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Zeitschrift, Artikel |
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Jahr |
1980 |
Publikation |
Finnish Fisheries Research |
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3 |
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Seiten |
23-28 |
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Schlüsselwörter |
Fischerei, statistik, lÄngenfrequenz, wachstum, methode |
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Zusammenfassung |
A classification system for whitefish (Coregonus lavaretus L. s.l.) stocks was developed. The classification program is based on frequency distributions of gillrakers and length distributions in different age-groups. The system is based on time sharing, interactive use of a UNIVAC-1108 computer with a terminal. |
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Rufnummer |
285 |
Signatur |
2163 |
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Autor |
Gayanilo, F. C.; Soriano, M.; Pauly, D. |
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Titel |
A Draft Gruide to the Compleat ELEFAN |
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Zeitschrift, Artikel |
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Jahr |
1988 |
Publikation |
International Center for Living Aquatic Resources Management |
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62 |
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Fischerei, statistik, software, dokumentation, methode |
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Rufnummer |
211 |
Signatur |
2099 |
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Autor |
Hewett, S. W.; Johnson, B. L. |
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Titel |
A Generalized Bioenergetics Model of Fish Growth for Microcomputers |
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Zeitschrift, Artikel |
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Jahr |
1800 |
Publikation |
Communications Office, UW Sea Grat Institute |
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Band |
53705 |
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Seiten |
53705 |
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Schlüsselwörter |
Bioenergetik, modell, theorie, dokumentation |
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Rufnummer |
280 |
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2158 |
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Autor |
Sparre, P. |
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Titel |
A method for the estimation of growth, mortality and gear selection/recruitment parameters from length-frequency samples weighted by catch per effort |
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Buch, Kapitel |
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Jahr |
1987 |
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13 |
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Seiten |
75-102 |
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Schlüsselwörter |
stock-assessment; recruitment-; size-distribution; length-; mathematical-models, marine-fisheries |
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Zusammenfassung |
This paper describes a method and a FORTRAN program for the estimation of von Bertalanffy growth parameters, total mortality rates and gear selection/recruitment parameters from a time series of length-frequency samples weighted by catch per effort (e.g., numbers caught per hour by length class each quarter of the year). The length frequencies are separated into normally distributed components each of which represents a cohort. This method is constructed to allow for continuous, seasonally variable recruitment all year-round and is intended to be used especially for tropical and other fish stocks displaying an appropriate recruitment pattern. |
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MAZZARA-DEL-VALLO,-ITALY |
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Pauly, D.; Morgan, G. R. |
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nein |
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1592 |
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Autor |
Pauly, D. |
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Titel |
A Preliminary Compilation of Fish Length Growth Parameters |
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Jahr |
1978 |
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107 |
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Schlüsselwörter |
Fisch, Fischerei, Statistik, Methode, Länge, Gewicht |
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Institut für Meereskunde, Christian-Albrechts-Universität |
Erscheinungsort |
Kiel |
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55 |
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55 |
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nein |
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Rufnummer |
606 |
Signatur |
2400 |
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Autor |
Levin, J. Z. |
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Titel |
A rational parametric approach to latitude, longitude, and altitude |
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Zeitschrift, Artikel |
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Jahr |
1988 |
Publikation |
Navigation Wash. |
Kurztitel der Zeitschrift |
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Band |
35 |
Ausgabe |
3 |
Seiten |
361-370 |
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Schlüsselwörter |
mapping-; map-projections; coordinate-systems; cartography-; latitude-; longitude-; height- |
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Zusammenfassung |
A method for parametrically representing the surface of the earth is described. Latitude and longitude are replaced by parametric pseudolatitude and pseudolongitude. Conversions between Cartesian coordinates in three-space and the parametric form are described. A compact and precise algorithm for cartesian-to parametric form has been developed by way of tested computer procedures. |
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1012 |
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Whitmarsh, D.; Voit, E. O.; Balthis, W. L.; Holser, R. A. |
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Titel |
A spreadsheet model of renewable resource exploitation – Hierarchical Monte Carlo modeling with S-distributions: Concepts and illustrative analysis of mercury contamination in king mackerel |
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Jahr |
1991 |
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Schlüsselwörter |
Renewable-resources; Mathematical-models; Natural-resources; Economics-; Dynamic-analysis, Environmental-economics, Monte-Carlo-method; simulation-; numerical-analysis; mercury-; bioaccumulation-; fish-; quantitative-analysis; statistical-models; data-processing; pollution-effects; mathematical-models; scomberomorus-cavalla, S-distributions |
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Zusammenfassung |
Increasing numbers of students now study natural resource and environmental economics at undergraduate level, and this interest in the subject has been matched by a corresponding expansion in the number of textbooks and other learning material available for use. Unfortunately one very important aspect of natural resource economics which is often not adequately dealt with in the undergraduate literature concerns the question of dynamics: how rapidly will a resource become exploited, and what time path will it follow? These issues are particularly relevant to the management of renewable resources such as fish stocks whose survival depends on factors such as the rate of entry and exit by the exploiting firms, and the ability of the resource to recover from the effects of intense harvesting. The fault of most textbooks stems not from a failure to cover the question of dynamics, but rather that the treatment is often too advanced or mathematical for the majority of students. Computers can make a useful contribution to our understanding of the dynamics of natural resource exploitation, and in this example the case of marine commercial fishery exploited under 'open-access' conditions is considered. The quantitative assessment of environmental contaminants is a complex process. It involves nonlinear models and the characterization of variables, factors, and parameters that are distributed and dependent each other. Assessments based on point estimates are easy to perform, but since they are unreliable, Monte Carlo simulations have become a standard procedure. Simulations pose two challenges: They require the numerical characterization of parameter distributions and they do not account for dependencies between parameters. This paper offers strategies for dealing with both challenges. The first part discusses the characterization of data with the S-distribution. This distribution offers several advantages, which include simplicity of numerical analysis, flexibility in shape, and easy computation of quantiles. The second part outlines how the S-distribution can be used for hierarchical Monte Carlo simulations. In these simulations the selection of parameter values occurs sequentially, and each choice depends on the parameter values selected before. The method is illustrated with preliminary simulation analyses that are concerned with mercury contamination in king mackerel (Scomberomorus cavalla). It is demonstrated that the results of such hierarchical simulations are generally different from those of traditional Monte Carlo simulations. |
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Zu bestellen |
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1809 |
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Autor |
Gaschütz, G.; Pauly, D.; David, N. |
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Titel |
A versatile BASIC program for fitting weight and seasonally oscillating length growth data |
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Zeitschrift, Artikel |
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Jahr |
1980 |
Publikation |
COPENHAGEN-DENMARK-ICES |
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23 |
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Statistik, wachstum, methode, formeln, theorie, basic, listing |
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SO: 1980. 23 pp |
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278 |
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2156 |
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Autor |
Millar, R. B. |
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Titel |
A versatile computer program for mixed stock fishery composition estimation |
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1990 |
Publikation |
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32 |
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Schlüsselwörter |
check-lists; approximation-; computer-programmes; stock-assessment |
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Zusammenfassung |
This technical report describes a FORTRAN program (HISEA.FOR) to be used in the study of mixed stock fishery composition estimation. Program HISEA is a versatile research tool capable of performing analyses. The simplest use of HISEA is to perform a composition analysis. The program can then be run in bootstrap mode to provide a non-parametric estimate of the reliability of the estimated compositions. In simulation mode, HISEA can quantify the effect of changing sample sizes; of adding or removing variables; and of adding or removing stocks. Simulation also identifies potential problems (such as high bias and variance in the composition estimators) that may arise due to different stocks being too alike. |
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Department of Fisheries and Oceans, St. John's, Nfld. (Canada) |
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1753 |
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1753 |
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1112 |
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