SynopsisBrown trout (Salmo trutta) were more efficient than Arizona trout (Salmo apache) in eating brine shrimp at starlight fL) light levels. Arizona trout required light levels 2 moonlight (10-VL) to feed. In bright light (50 fL), brown trout utilized cover to a much greater extent in both field and laboratory. Our study indicates that factors other than competition for food or habitat are probably causing the displacement of Arizona trout by brown trout when browns are stocked into the native habitat of Arizona trout.
Single refrigeration units have been used to chill water in separate tanks simultaneously by using a flow-through system between tanks. This method is satisfactory when an experiment does not require that the waters in the tanks be discontinuous. However, many aquatic behavioral experiments are replicated in separate tanks that require discontinuous waters to prevent an exchange of dissolved substances. These experiments require cooling units for each tank.
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