Wohlgemuth, E. (1989). Fische und Neunaugen in der Tschechoslowakei (Vol. 1).
Schlüsselwörter: Fisch, Vorkommen, Kartierung
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Wunder, W., Pesch, H. - J., & Henschke, F. (1989). Plekospondylie beim Gangfisch Coregonus macrophtalmus aus dem Bodensee (Vol. 1).
Schlüsselwörter: Fisch, Gangfisch, Felchen, Maräne, Bodensee, Parasit, Coregonus macrophthalmus, Coregonus lavaretus
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Stamatopoulos, C., & Caddy, J. F. (1989). Estimation of von Bertalanffy growth parameters: A versatile linear regression approach (Vol. 45).
Zusammenfassung: A new linear regression method is presented for fitting the von Bertalanffy growth function to data on size at age, which is also applicable to tag and recapture data. From tests on simulated data the method shows lower error and bias and more flexibility of action than other commonly used methods.
Schlüsselwörter: Fischerei, statistik, modell, wachstum
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Yamagishi, H., & Ishioka, K. (1989). Simulation study on the growth variation of fish with special reference to the sexual dimorphism in growth.
Zusammenfassung: With respect to the sexual dimorphism in growth of fish, computer simulation of individual growth variation was made in terms of coefficient of variation (CV) and skewness (sk) of frequency distribution. Normal distributions of initial body length, specific growth rate in exponential growth coefficient in asymptotic growth and asymptotic value (each consisting of 500 monosexual distributions) were supposed. In exponential growth both CV and sk of the bisexual distributions increased more quickly than the two monosexual distributions. In asymptotic growth (Bertalanffy and Logistic) CV of the bisexual distribution was always greater than the monosexual distributions, and sk of the former was greater in positive value and smaller in negative value than those of the latter all the time.
Schlüsselwörter: Sex, wachstum, simulation, methode, theorie, mathematik, statistik
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Halsband, E. (1989). Nur durch elektrischen Impulsstrom ist das Scheuchen und Leiten von Fischen wirksam möglich (Vol. 39).
Schlüsselwörter: Fisch, Elektrofischerei, Aufstiegshilfe
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Lemann, J. (1989). Die Multi-Threaded/Multi-Server-Architektur.
Schlüsselwörter: Datenbank, theorie
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(1989). Vergleichstest.
Schlüsselwörter: Hard-test, theorie
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Düsing, R. (1989). Geistiges Eigentum.
Schlüsselwörter: Theorie, recht, software
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Krivan, V., & Seda, J. (1989). Application of a guaranteed regression model to trophic interaction in an aquatic system (Vol. 49).
Zusammenfassung: 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.
Schlüsselwörter: Ökosystem, modell, interaktion, trend, fisch, statistik
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Hanel, L. (1989). Die Beziehung zwischen Körperlänge und -gewicht bei besonders großen Fischen aus tschechoslowakischen Gewässern (Vol. 1).
Schlüsselwörter: Fisch, Länge, Gewicht, Relation
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