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Trent, L., Palko, B. J., & Trimble, A. (1987). Improved Method of Measuring Length of Large Samples of Fish (Vol. 49).
Zusammenfassung: A new method to record fish lengths is described. Its advantages include quick recording of large numbers of fish by one person, accurate measurements by inexperienced personnel, easy transmission of data, low expense, usability under harsh field conditions, and easy transportability.
Schlüsselwörter: Methode, fischerei
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Deutsches Institut für, N. (1987). DIN 38410 Teil 1 und Teil 2 – Biologisch-ökologische Gewässeruntersuchungen (Gruppe M).
Schlüsselwörter: Saprobie, theorie, methode, norm
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Bayley, P. B., & Illyes, R. F. (1988). Measuring Fish and Recording Data in the Field and Laboratory: A Microcomputer Application (Vol. 13).
Schlüsselwörter: Hardware, methode, theorie, fischerei
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Armstrong, M. C., Nagtegaal, D. A., & Boutillier, J. A. (1989). Microcomputer-Based Measuring Device for Collecting Biological Data (Vol. 51).
Schlüsselwörter: Hardware, theorie, methode, fischerei
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Shoesmith, E. (1990). A comparison of methods for estimating mean fecundity (Vol. 36).
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.
Schlüsselwörter: LÄngenfrequenz, normalverteilung, methode, theorie, mathematik, vergleich, statistik
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Gayanilo, F. C., Soriano, M., & Pauly, D. (1988). A Draft Gruide to the Compleat ELEFAN (Vol. 62).
Schlüsselwörter: Fischerei, statistik, software, dokumentation, methode
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Misra, R. K. (1980). Statistical Comparisons of Several Growth Curves of the von Bertalanffy Type (Vol. 37).
Schlüsselwörter: Wachstum, theorie, vergleich, mathematik, statistik, modell
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Kaufmann, K. W. (1981). Fitting and Using Growth Curves (Vol. 49).
Schlüsselwörter: Wachstum, methode, vergleich, statistik, modell
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Cryer, M., Peirson, G., & Townsend, C. R. (1986). Reciprocal interactions between roach, Rutilus rutilus, and zooplankton in a small lake: Prey dynamics and fish growth and recruitment (Vol. 31).
Schlüsselwörter: Population, wachstum, methode, nahrung, interaktion
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Akamine, T. (1986). Expansion of growth curves using a periodic function and BASIC programs by Marquardt's method.
Zusammenfassung: 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.
Schlüsselwörter: Wachstum, modell, methode, listing, basic, fischerei, statistik, algorithmus
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