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Autor Juell, J. E.; Westerberg, H.   
  Titel An ultrasonic telemetric system for automatic positioning of individual fish used to track Atlantic salmon (Salmo salar L.) in a sea cage Typ Zeitschrift, Artikel
  Jahr 1993 Publikation Aquacult. Eng Kurztitel der Zeitschrift  
  Band 12 Ausgabe 1 Seiten 1-18  
  Schlüsselwörter telemetrie, fische, methode, technik  
  Zusammenfassung (down) 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.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Geprüft nein  
  Rufnummer 478 Signatur 2279  
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Autor Mertz, G.; Myers, R. A.   
  Titel Estimating the predictability of recruitment Typ Zeitschrift, Artikel
  Jahr 1995 Publikation Fish. Bull Kurztitel der Zeitschrift  
  Band 93 Ausgabe 4 Seiten 657-665  
  Schlüsselwörter recruitment-; mortality-; developmental-stages; fishery-biology; fishery-management; environmental-factors; stock-assessment; Pisces-; population-dynamics; models-  
  Zusammenfassung (down) A simple analytical technique is developed for estimating the predictability of recruitment, that is, correlations between recruitment and stage-specific mortalities or abundances. The method requires the input of estimates of the variability of stage-specific mortalities, which may be calculated from mean stage-specific mortalities by applying a published regression. It is shown that modification of this regression to compensate for sampling error in field measurements of abundance significantly reduces the estimated standard deviation of log-recruitment, which is an important factor in the predictability calculations. It is concluded that the prospects for predicting recruitment from egg or larval surveys or from environmental variables are quite poor for fish stocks showing the typical distribution of mortality across stages.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Zu bestellen Geprüft  
  Rufnummer Signatur 1090  
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Autor Francis, R. I. C. C.   
  Titel Back-calculation of fish length: A critical review Typ Zeitschrift, Artikel
  Jahr 1990 Publikation J. Fish Biol Kurztitel der Zeitschrift  
  Band 36 Ausgabe 6 Seiten 883-902  
  Schlüsselwörter Fisch, Statistik, Regression, Längen..., Review, Wachstum  
  Zusammenfassung (down) A review is made of the literature on the back-calculation of fish body length from marks on scales or other hard parts (otoliths, vertebrae, fin rays, etc.). Though the technique is widely used it does not appear to be well understood. Regression methods are commonly used, apparently in ignorance of the more realistic proportional methods. It is not generally recognized that there are two equally plausible back-calculation hypotheses which can lead to significantly different back-calculated lengths. The Fraser-Lee equation, the most commonly used back-calculated formula, follows neither of these hypotheses but is based on a misuse of linear regression. It is recommended that back-calculation be restricted to procedures following one of the proportional hypotheses; that the difference between lengths calculated using the two hypotheses is a useful measure of the minimum uncertainty in back-calculation lengths; and that more attention be paid to validating back-calculation hypotheses by comparing observed and back-calculated lengths for individual fish. The pattern of heteroscedasticity in body length-scale radius plots is noted as a useful diagnostic in evaluating back-calculation hypothesis.  
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  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Fish. Res. Cent., Box 297, Wellington, New Zealand Geprüft  
  Rufnummer 530 Signatur 2329  
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Autor Trent, L.; Palko, B. J.; Trimble, A.   
  Titel Improved Method of Measuring Length of Large Samples of Fish Typ Zeitschrift, Artikel
  Jahr 1987 Publikation The Progressive Fish Culturist Kurztitel der Zeitschrift  
  Band 49 Ausgabe 4 Seiten 310-312  
  Schlüsselwörter Methode, fischerei  
  Zusammenfassung (down) 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.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Geprüft  
  Rufnummer 216 Signatur 2104  
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Autor Stamatopoulos, C.; Caddy, J. F.   
  Titel Estimation of von Bertalanffy growth parameters: A versatile linear regression approach Typ Zeitschrift, Artikel
  Jahr 1989 Publikation J. CONS. CIEM. Kurztitel der Zeitschrift  
  Band 45 Ausgabe 2 Seiten  
  Schlüsselwörter Fischerei, statistik, modell, wachstum  
  Zusammenfassung (down) A new linear regression method is presented for fitting the von Bertalanffy growth function to data on size at age, which is also applicable to tag and recapture data. From tests on simulated data the method shows lower error and bias and more flexibility of action than other commonly used methods.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Geprüft  
  Rufnummer 311 Signatur 2179  
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Autor Tipping, J. M.   
  Titel Measuring fish by video image processing Typ Zeitschrift, Artikel
  Jahr 1994 Publikation Prog. Fish Cult Kurztitel der Zeitschrift  
  Band 56 Ausgabe 4 Seiten 299-300  
  Schlüsselwörter hardware, fische, methode  
  Zusammenfassung (down) A microcomputer system that weighs and measures fish and records the data on a computer file was tested at two hatcheries. The device produced fairly accurate lengths and might save labor and reduce transcription errors.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Geprüft nein  
  Rufnummer 466 Signatur 2267  
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Autor Pauly, D.; Prein, M.; Hopkins, K. D.   
  Titel Multiple regression analysis of aquaculture experiments based on the “extended gulland-and-holt plot”: Model derivation, data requirements and recommended procedures Typ Zeitschrift, Artikel
  Jahr 1993 Publikation Iclarm Stud. Rev. Kurztitel der Zeitschrift  
  Band Ausgabe 20 Seiten 13-23  
  Schlüsselwörter fish-culture; freshwater-aquaculture; Oreochromis-; multivariate-analysis  
  Zusammenfassung (down) A method for the multivariate analysis of fish growth in aquaculture is presented. It is derived from a linearized version of the von Bertalanffy growth function (VBGF), which, in its original form, is a bivariate regression termed the Gulland-and-Holt plot. Here, a version in form of a multiple regression equation is presented. The “extended Gulland-and-Holt plot” permits to identify and quantify the key variables controlling fish growth and permits the inclusion of these environmental and treatment variables to explain variance in growth of fish. Von Bertalanffy growth parameters K and L sub( arrow left ) are obtained, which contain the combined environmental effects on fish growth and reflect the range of culture conditions. By computing the index of growth performance ( Phi '), the obtained regression models can be used for growth prediction and decisionmaking in fish farm management and production under a wide range of environmental and management conditions. Recommendations for the design of experiments, preparation of data for analysis and actual analysis procedures are given.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Zu bestellen Geprüft  
  Rufnummer Signatur 1257  
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Autor Levin, J. Z.   
  Titel A rational parametric approach to latitude, longitude, and altitude Typ Zeitschrift, Artikel
  Jahr 1988 Publikation Navigation Wash. Kurztitel der Zeitschrift  
  Band 35 Ausgabe 3 Seiten 361-370  
  Schlüsselwörter mapping-; map-projections; coordinate-systems; cartography-; latitude-; longitude-; height-  
  Zusammenfassung (down) A method for parametrically representing the surface of the earth is described. Latitude and longitude are replaced by parametric pseudolatitude and pseudolongitude. Conversions between Cartesian coordinates in three-space and the parametric form are described. A compact and precise algorithm for cartesian-to parametric form has been developed by way of tested computer procedures.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Geprüft  
  Rufnummer Signatur 1012  
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Autor Ward, G.; Fitzgerald, G. J.   
  Titel Male aggression and female mate choice in the threespine stickleback, Gsterosteus aculeatus L. Typ Zeitschrift, Artikel
  Jahr 1987 Publikation J. Fish. Biol. Kurztitel der Zeitschrift  
  Band Ausgabe 30 Seiten 679-690  
  Schlüsselwörter Sex, Fisch, Verhalten, Saison  
  Zusammenfassung (down) A laboratory study of female G. aculeatus revealed no conclusive evicence of active female mate choice on the basis of male aggression levels. However, highly aggressive males failed in 95% of all choice tests. The less aggressive ´chosen´ males where generally successful again in subsequent trials with the same female, and certain males were consistently successful with different females. Females exhibited an increased readiness to spawn at the end of the reproductive season, although the same males were usually selected again.  
  Adresse  
  Organisation Abschlussarbeit  
  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Geprüft nein  
  Rufnummer 479 Signatur 2280  
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Autor McGarvey, R.   
  Titel An age-structured open-access fishery model Typ Zeitschrift, Artikel
  Jahr 1994 Publikation Can. J. Fish. Aquat. Sci. Kurztitel der Zeitschrift  
  Band 51 Ausgabe 4 Seiten 900-912  
  Schlüsselwörter modell, statistik, population, dynamik, algorithmus  
  Zusammenfassung (down) A dynamic model for open-access fisheries is presented. In addition to density dependence in recruitment and fishing effort changing in proportion to the level of profit fishermen earn which characterizes previous open-access models, it incorporates full age structure for the fish stock, lognormal environmental recruitment variability, and gear selectivity. The predator-prey cycling solution of the original Schaefer dynamic model, and subsequent open-access models, persists for these model extensions. Density dependence in recruitment induces greater global stability. Environmental recruitment variability, common in marine populations, is destabilizing in the neighborhood of the open-access equilibrium. Approximating model steady states of effort and catch by the corresponding averages from data time series underlies a new algorithm of parameter evaluation, applied here to an open-access model of the Georges Bank sea scallop (Placopecten magellanicus) fishery.  
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  Herausgeber Erscheinungsort Editor  
  Sprache Sprache der Zusammenfassung Originaltitel  
  Editor der Reihe Titel der Reihe Kurztitel der Reihe  
  Band der Reihe Ausgabe der Reihe Edition  
  ISSN ISBN Medium  
  Bereich Expedition Konferenz  
  Notizen Geprüft nein  
  Rufnummer 469 Signatur 2270  
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