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Haukioja, E., & Hakala, T. (1979). Asymptotic equations in growth studies – an analysis based on Anodonta piscinalis (Mollusca, Unionidae) (Vol. 16).
Schlüsselwörter: Wachstum, methode, vergleich, statistik, muscheln
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Schnute, J. T., & Richards, L. J. (1990). A Unified Approach to the Analysis of Fish Growth, Maturity, and Survivorship Data (Vol. 47).
Schlüsselwörter: Theorie, wachstum, Reife, methode, mathematik, statistik, fisch
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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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Richards, L. J., Schnute, J. T., Kronlund, A. R., & Beamish, R. J. (1801). Statistical Models for the Analysis of Ageing Error (Vol. 49).
Schlüsselwörter: Fischerei, population, alter, lÄngenfrequenz, statistik, methode, mathematik
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English, K. K., & Bocking, R. C. (1992). A Robust Procedure for Estimating Salmon Escapement based on the Area-Under-the-Curve Method (Vol. 49).
Schlüsselwörter: Fischerei, population, wachstum, methode, mathematik, theorie
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Soriano, M., Moreau, J., Hoenig, J. M., & Pauly, D. (1992). New functions for the analysis of two-phase growth of juvenile and adult fishes, with application to Nile perch (Vol. 121).
Zusammenfassung: Two phases of growth can sometimes be distinguished in long-lived fish species. The first involves the growth of zooplankton-feeding juveniles and young adults. The second consists of accelerated growth of large, piscivorous adults. We present modified versions of the von Bertalanffy growth equation that account for this feature and fit them to length-at-age data on Nile perch Lates niloticus (Centropomidae) from Lake Chad (north and south) in north-central Africa, and from Lake Nasser in Egypt. The growth parameters estimated for the new equations allow one to make preliminary estimates of the energy gains by Nile perch associated with transition from zooplanktivory to piscivory.
Schlüsselwörter: Fischerei, wachstum, theorie, modell
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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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Ricker, W. E. (1992). Back-Calculation of Fish Lengths Based on Proportionality between Scale and Length Increments (Vol. 49).
Schlüsselwörter: Fischerei, statistik, methode, wachstum
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