Summary
Energy budgets of juvenile pike and perch (weighing approximately 3 g) were determined in experiments lasting up to 4 days, by simultaneously measuring oxygen consumption, food consumption, and growth of individual fish. Although the basic pattern of energy allocation was identical in the two species, perch subjected to constant light (PEL) showed faster growth, higher assimilation and conversion efficiency, and higher oxygen consumption than perch subjected to a short daylength regime (PED). The efficiency with which food energy was converted into body mass was 39±5% in PED but 49±4% in PEL. However, the “work coefficient” (increment of body mass/post-prandial increase of oxygen consumption: mg · μmol O sup−1inf2 ) differed only insignificantly between the two groups of perch, indicating that the metabolic cost of growth was unaffected by the manipulation of experimental conditions. This identifies the higher assimilation efficiency, i.e. the increased flow of food energy into the tissues as being the cause of accelerated growth of perch under the constant-light regime. In both species the maximum feeding-induced metabolic rate was 4 times higher than the lowest preprandial rate. In perch (which were kept on low rations before the experiments) the post-prandial metabolic rate increased steadily from day to day during the 4-day experiments, so that on the last day the rate of oxygen consumption exceeded the rate on the first day by about 41%. This investigation provides further evidence that the allocation of metabolic energy in fish is based on a flexible strategy which responds sensitively to changes in both internal and external conditions.
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Wieser, W., Medgyesy, N. Metabolic rate and cost of growth in juvenile pike (Esox lucius L.) and perch (Perca fluviatilis L.): the use of energy budgets as indicators of environmental change. Oecologia 87, 500–505 (1991). https://doi.org/10.1007/BF00320412
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DOI: https://doi.org/10.1007/BF00320412