Stoiber, W. (1991). Differenzierung der Rumpfmuskulatur larvaler Cypriniden: Feinstruktur und Morphometrie. Salzburg: Universität.
Schlüsselwörter: Fisch, Wachstum, Cypriniden, Jungfische, Larve
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Suter, W. (1991). Der Einfluß fischfressender Vogelarten auf Süßwasserfischbestände – eine Übersicht (Vol. 132).
Schlüsselwörter: Fisch, Vögel, Gefährdung
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Gisler, B. (1991). Vergleich des Freßverhaltens von Bachforellen (Salmo trutta fario L.) mit der Makroinvertebratendrift. Zürich: Eidgenössische technische Hochschule.
Schlüsselwörter: Fisch, Salmo, Nahrung, Verhalten
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Sparre, P. (1991). Introduction to multispecies virtual population analysis (Vol. 193).
Schlüsselwörter: Fischerei, methode, vpa, statistik, Grundlage
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Bax, N. J., Mehl, S., Godo, O. R., & Sunnana, K. (1991). Transparent multispecies analysis: an exploration of fisheries ans survey data off the Norwegian coast and Barents Sea (Vol. 193).
Schlüsselwörter: Fischerei, population, modell, Ökosystem, interaktion, statistik
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Mohn, R. (1991). Length-Based Virtual Population Analysis; A Review and Swordfish Example.
Zusammenfassung: Length-based population analyses have had a fairly long but not too successful history. These methods are required over a range of situations from when aging is impossible to when it is difficult or prohibitively expensive. There have been 3 sorts of approaches: 1) modal analysis to convert length frequencies to ages 2) age-length key enhancement and 3) imbedded growth models. The last group is what is generally known as length-based methods and the focus of this review. At the 1991 ICES Methods Working Group, 5 techniques were compared and these results are summarized. Two of these techniques, cohort slicing and length-based ADAPT, are applied to swordfish (Xiphias gladius ) data. The imbedded growth model for the former technique is the mean size at age while the latter uses the distribution of size at age. A new method is also presented which begins with cohort slicing then estimates numbers at age and enhances an inferred age-length key at each step of an iterative process.
Schlüsselwörter: Fischerei, population, cpue, lÄngenfrequenz, wachstum, modell, statistik
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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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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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Murphy, B. R., Willis, D. W., & Springer, T. A. (1991). The Relative Weight Index in Fisheries Management: Status and Needs (Vol. 16).
Schlüsselwörter: Fischerei, statistik, wachstum, modell
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Conrad, V. (1991). Versuche zur Wiedereinbürgerung der Meerforelle in Rheinland-Pfalz (Vol. 4).
Schlüsselwörter: Fisch, Meerforelle, Wiedereinbürgerung, Salmo trutta
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