标题：A simple approach for the estimation for food consumption from growth rates at different environmental conditions and its application to juvenile cod (Gadus morhua L.) of a fjordic sea loch on the west coast of Scotland
期刊名称：Informationen aus der Fischereiforschung (Formerly Informationen für die Fischwirtschaft aus der Fischereiforschung)
印刷版ISSN：1860-9902
电子版ISSN：1861-2164
出版年度：2010
卷号：57
出版社：Bundesforschungsanstalt für Fischerei
摘要：Growth and condition of fish are functions of available food and environmental conditions. This led to the idea of using fish as a "consumption sensor" for the measurement of food intake over a defined period of time. A bio-physical model for the estimation of food consumption was developed bas ed on the von Bertalanffy model. Whereas some of the input variables of the model, the initial and final lengths and masses of a fish and the temperature within the time period considered can eas ily be measured, internal characteristics of the species have to be determined indirectly. Three internal parameters are used in the model: the maintenance consumption at 0°C, the temperature dependence of this consumption and the food efficiency, the percentage of the ingested food utilized. Estimates of the parameters for a given species can be determined by feeding experiments. Here, data from published feeding experiments on juvenile cod, G adus morhua L., were used to validate the model. The average of the relative error for the food intake predicted by the model for individual fish was about 24 %, indicat-ing that fish used the food with different efficiencies. However, grouping the fish according to s iz e classes and temperature lowered the relative error of the predicted food intake for the group to typically 5 %. For a group containing all fish of the feeding experiment the relative prediction error was about 2 %.
