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Boutillier, J., Noakes, D., Heritage, D., & Fulton, J. (1988). Use of multiattribute utility theory for designing invertebrate fisheries sampling programs (Vol. 8).
Zusammenfassung: Multiattribute utility theory (MAUT) and integer programming are employed to examine optimal sampling strategies for commercial invertebrate fisheries in British Columbia, Canada. Attributes considered in the study take into account various biological, economic, social, and political aspects of the fisheries. Twenty-six fishery managers, biologists, and researches from the Department of Fisheries and Oceans participated in ranking and assigning weights to each of the attributes to provide overall utility scores. Integer programming was then employed to generate optimal sampling strategies subject to various cost, personnel, are, and fishery constraints. The results clearly demonstrate the potential usefulness of MAUT analysis for developing strategies to monitor commercial invertebrate fisheries.
Schlüsselwörter: Fischerei, theorie, statistik, methode, multivariat, zusammenfassung
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Brunken, H. (1988). Ausbreitungsdynamik von Noemacheilus barbatulus (L., 1758). Braunschweig: Carolo-Wilhelmina Universität.
Schlüsselwörter: Fisch, Bachschmerle, Noemacheilus barbatulus, Ausbreitung
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Caputi, N. (1988). Factors affecting the time series bias in stock-recruitment relationships and the interaction between time series and measurement error bias (Vol. 45).
Zusammenfassung: The stock-recruitment relationship (SRR) and the recruitment to spawning stock relationship (RSR) of the tiger prawn (Penaeus esculentus ) in Exmouth Gulf, Western Australia, were used to examine the time series bias and measurement error bias by Monte Carlo simulations. Simulating the effect of measurement error as well as the random variation about the SRR and RSR helps to determine the possible combinations of measurement error and random variation which may result in the observed variation about the SRR and RSR. The simulations also indicate that there is an interaction between measurement error and random variation about the SRR/RSR on the bias of the parameters of the SRR.
Schlüsselwörter: Fischerei, statistik, zeitreihe, methode, modell, theorie
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Castro, M., & Erzini, K. (1988). Comparison of two length-frequency based packages for estimating growth and mortality parameters using simulated samples with varying recruitment patterns (Vol. 86).
Zusammenfassung: Length-frequency distributions were simulated for species with recruitment patterns characteristic of many tropical fish: 1) one recruitment peak per year, fast growth and very high mortality, 2) one recruitment peak per year, slow growth and moderate to high mortality 3) two recruitment peaks per year, slow growth and moderate to high mortality, and 4) random recruitment, slow growth and moderate to high mortality. Two microcomputer program packages – one incorporating the ELEFAN I & II programs and the other implementing a form of Modal Progression Analysis – were used to estimate growth and mortality parameters, and these were compared with the initial parameters used to generate the simulated samples. The results, while generally encouraging, suggest that multiple recruitments per year make it difficult to estimate growth and mortality parameters using these two packages.
Schlüsselwörter: Methode, wachstum, mortalitÄt, lÄngenfrequenz, vergleich, statistik, fisch
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Dilewski, G., & Scharf, B. W. (1988). Verbreitung des Graskarpfens (Ctenopharyngodon idella, Val.) und ökologische Auswirkungen in Rheinland-Pfalz (Vol. 63).
Schlüsselwörter: Fisch, Neozoon, Graskarpfen, Ctenopharyngodon idella, Ökologie
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Dönni, W. (1988). Verbuttung der Laube (Alburnus alburnus) und des Brachsen (Abramis brama) im Federsee. Zürich: Universität.
Schlüsselwörter: Fisch, Verbuttung, Alburnus, Abramis, Wachstum, Nahrung
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Eckmann, R., Gaedke, U., & Wetzlar, H. J. (1988). Effects of Climatic and Density-Dependent Factors on Year-Class Strength of Coregonus lavaretus in Lake Constance (Vol. 45).
Zusammenfassung: The influences of density-dependent and density-independent factors on year-class strength (YCS) of Corogonus lavaretus in Lake Constance were studied by multiple linear regression analyses for the period from 1962 to 1982. Meteorological conditions that lead to early thermal stratification of the lake in April are of prime importance for YCS and account for 41% of the total YCS variance. Zooplankton concentration during spring has no significant influence on YCS. The extensive stocking program on the lake (50-200 million larvae stocked per year) significantly supports YCS, but this relationship becomes apparent only after the influence of meteorological conditions are removed from the data.
Schlüsselwörter: Fischerei, zeitreihe, modell, statistik
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Eichert, R., Wetzlar, H. J., & Troschel, J. (1988). Die zehnfüssigen Süßwasserkrebse Mitteleuropas.
Schlüsselwörter: Fischerei, Krebse, bestimmung, methode
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Flüchter, J. (1988). Spontanes Ablaichen von Elritzen im Aquarium (Vol. 38).
Schlüsselwörter: Fisch, Fortpflanzung, Phoxinus, Verhalten, Ontogenie
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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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