Juell, J. E., & Westerberg, H. (1993). An ultrasonic telemetric system for automatic positioning of individual fish used to track Atlantic salmon (Salmo salar L.) in a sea cage (Vol. 12).
Zusammenfassung: A telemetric system for automatic positioning of individual fish in the vertical or horizontal plane is described. The position of a transmitter in a fish is computed from the difference in arrival time of the ultrasonic signal to a fixed array of hydrophones. Sources of error in positioning are discussed. In a preliminary study, the resolution of the system in time and space was adequate to monitor the behaviour of adult salmon in a sea cage. At moderate stocking density the salmon was swimming continually in counter-clockwise circles and diel rhythms in swimming speed, depth and path-radius were observed. With only 30 fish in the cage this stereotype behaviour broke down. Few or no visits into the feeding area during some feedings indicated a variable feeding motivation.
Schlüsselwörter: telemetrie, fische, methode, technik
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Zink, R. (1989). ANSI, die zweite.
Schlüsselwörter: Tastatur, methode
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Gronek, G. (1995). Ähnlichkeiten gesucht – Fehlertoleranter Suchalgorithmus `Shift-AND`.
Schlüsselwörter: suchen, algorithmus, textverarbeitung, theorie, c, listing
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Stahlberg, S., & Peckmann, P. (1986). Bestimmung der kritischen Strömungsgeschwindigkeit für einheimische Kleinfischarten (Vol. 76).
Schlüsselwörter: Strömungsgeschwindigkeit
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Jungwirth, M., & Winkler, H. (1983). Die Bedeutung der Flussbettstruktur für Fischgemeinschaften (Vol. 35). Österreichische Wasserwirtschaft.
Schlüsselwörter: Struktur, Fisch, Habitat
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Bohle, E., & Lehmann, R. (1989). Zur Bedeutung der Struktur von Fließgewässern für das Fischleben (Vol. 46). Arb. dt. Fischverband.
Schlüsselwörter: Struktur, Fisch
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Hiramatsu, K., Akamine, T., & Kitada, S. (1995). Effectiveness of partial likelyhood of estimating fish mortality rates from tag recoveries and the stock composition in the mixed population based on genetic data.
Zusammenfassung: Because of the simplicity of calculation and the availability of evaluating the precision of the estimates, a partial likelihood approach has been used for estimating fish mortality rates from tag recoveries and the stock composition in the mixed population based on genetic data. We compare the partial likelihood estimator with the full likelihood estimator, and find that under some conditions, both estimators are the same. The above applications meet the conditions and hence the estimates using the partial likelihood are the same as the ones using the full likelihood. In this case, the partial likelihood approach is quite useful.
Schlüsselwörter: stock-assessment; tagging-; genomes-; fishing-mortality; mixing-ratio; mathematical-analysis
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Walters, C. (1995). Estimation of historical stock sizes and recruitment anomalies from relative abundance time series (Vol. 52).
Zusammenfassung: Often only simple relative abundance time series and basic growth and (or) survival estimates are available for assessing impacts of fishing and environmental factors. Assessment then involves fitting production models to the series, while forcing the model with observed catch or effort series. A key uncertainty in this approach is how to deal with recruitment variations due to factors other than stock size. A dynamic programming algorithm can be used to compute maximum likelihood estimates of the recruitment anomaly sequence, given prior knowledge of growth parameters, the natural survival rate, and proportion of the variation in the relative abundance index that is due to abundance measurement errors.
Schlüsselwörter: stock-assessment; approximation-; anomalies-; recruitment-; abundance-; growth-; survival-; algorithms-; fishery-management; marine-fisheries
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Reichholf, J. H. (2001). Früheres Vorkommen des Steinbeißers (Cobitis taenia) im Inselgebiet des Egglfinger Innstausees in Niederbayern (Vol. 8).
Schlüsselwörter: Stillgewässer, Vorkommen, Habitat, Fisch, Steinbeißer, Cobitis taenia, Bayern
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Reichholf, J. H. (2001). Erdkröten (Bufo bufo), Rutten (Lota lota) und Änderungen in der Leitfähigkeit eines kleinen Baches im niederbayerischen Inntal (Vol. 8).
Schlüsselwörter: Stillgewässer, Fließgewässer, Bestandsentwicklung, Gewässerbelastung, Amphibien, Erdkröte, Bufo bufo, Fisch, Trüsche, Quappe, Lota lota, Bayern
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