(1991). Kreis Herford: Fische der Fließgewässer. Herford: Amt für Landschaftsökologie.
Schlüsselwörter: Fisch, Verbreitung, Vorkommen, Kartierung
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Criddle, K. R. (1991). Modelling dynamic fish populations. Seattle, WA (USA): National Marine Fisheries Serv.
Zusammenfassung: A recently introduced multivariate state-space time-series modeling algorithm, system-theoretic time-series, can be used to create a particularly robust state-space representation. Combining the model approximation methodology with time-series modeling of the residuals in accurate models of short-run dynamics. The approximate structural modeling methodology is illustrated with single species models of yellowfin sole (Limanda aspera ) biomass, and multispecies models of Pacific halibut (Hippoglossus stenolepis ), yellowfin sole, and red king crab (Paralithodes camtschatica ) biomasses in the eastern Bering Sea. A final application of the approximate structural/system-theoretic time-series model includes walleye pollock (Theragra chalcogramma ), Pacific halibut, Pacific cod (Gadus macrocephalus ), yellowfin sole, and red king crab. (Prepared in cooperation with Alaska Univ., Fairbanks.)
Schlüsselwörter: fishery-biology; commercial-species; Limanda-aspera; Hippoglossus-stenolepis; Paralithodes-camtschatica; Theragra-chalcogramma; Gadus-macrocephalus; mathematical-models; biomass-; INE,-USA,-Alaska
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Diercking, R., & Wehrmann, L. (1991). Artenschutzprogramm: Fische und Rundmäuler in Hamburg. Hamburg: Umweltbehörde Hamburg.
Schlüsselwörter: Fisch, Vorkommen, Verbreitung, Kartierung
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Gerster, S. (1991). Hochrhein-Fischfauna im Wandel der Zeit. Interantionale Fischereikommision für den Hochrhein.
Schlüsselwörter: Fisch, Rhein
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Schmid, J. (1991). Einiges über die Äsche (Vol. 1991).
Schlüsselwörter: Fisch, Biologie, Thymallus, Beschreibung
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Jungwirth, M., & Muhar, S. (1991). Gutachten zu möglichen Auswirkungen von Kleinwasser-Kraftanlagen auf Fließgewässer-Ökosysteme.
Schlüsselwörter: Kraftanlagen, schÄden, gutachten, Ökosystem, fischerei
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Lepetit, M., Loranchet, S., Gillet, P., & Marion, J. M. (1991). Un Logiciel De Traitement Des Histogrammes De Structure De Population Par La M+Thode Des Differences Logarithmiques De Bhattachary (Vol. 41).
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.
Schlüsselwörter: Population, statistik, programm, pascal, lÄngenfrequenz, methode
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Sekine, M., Nakanishi, H., Ukita, M., & Murakami, S. (1991). A shallow-sea ecological model using an object-oriented programming language (Vol. 57).
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.
Schlüsselwörter: Ökosystem, modell, oop, methode, theorie
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Hiramatsu, K. (1991). Possible Biases in the VPA Estimates of Population Sizes of the Plus Group (Vol. 39).
Zusammenfassung: Biases in estimating population sizes of the plus group are examined for bluefin tuna (Thunnus ) and swordfish (Xiphias gladius ). It is shown that the VPA estimates used in the 1990 ICCAT assessment are sensitive to the systematic ageing errors. The biases in the estimates of population sizes of the plus group might increase exponentially with tracing back to the earlier year.
Schlüsselwörter: Fischerei, statistik, vpa, population, methode, theorie, mathematik
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McKenna, J. E., & Saila, S. B. (1991). Application of an Objective Method for Detecting Changes in Fish Communities: Samar Sea, Philippines (Vol. 4).
Schlüsselwörter: Fischerei, statistik, Ökosystem, methode, programm, simulation
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