The energy budget of the brown trout population of ovre Heimdalsvatn

@article{Lien1978TheEB,
  title={The energy budget of the brown trout population of ovre Heimdalsvatn},
  author={L. Lien},
  journal={Ecography},
  year={1978},
  volume={1},
  pages={279-300}
}
  • L. Lien
  • Published 1978
  • Biology
  • Ecography
Energy pathways of a natural brown trout Salmo trutta population were constructed. The main subjects taken into account were: the biomass, calorific values and production of the population, natural mortality and annual yield, energy intake, calorific values and composition of the food, efficiency of food absorption, spawning and migration of young trout. The specific energy value of trout increased with increasing weight of the fish. An energy decrease of almost 50% was demonstrated for the… Expand
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The total energy content of the food intake of a fish is either lost in the faeces and the excretory products or used for metabolism, growth and any reproductive products released during the periodExpand
The Energetics of Feeding, Metabolism and Growth of Brown Trout (Salmo trutta L.) in Relation to Body Weight, Water Temperature and Ration Size
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The chief purpose of the present paper is to provide information on feeding and growth in brown trout and to develop equations to estimate the various components of the energy budget. Expand
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Brown trout of similar length and weight were fed a standard meal which contained a known number of food organisms of the same size-group and taxon, and the weight of digestible organic matter in a trout stomach decreased exponentially with time. Expand
The life cycle dynamics and production of zooplankton in Øvre Heimdalsvatn
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The spring spate, June temperatures, food availability and invertebrate predation were found to be the most important regulatory factors for life cycle dynamics and production. Expand
The dynamics and exploitation of the brown trout population of Øvre Heimdalsvatn
The very dense trout population in the lake was substantially reduced by heavy fishing. The resulting changes in growth, age distribution and population density were examined. Fishing efforts with 32Expand
The invertebrate fauna of the streams in Øvre Heimdalen
TLDR
The lotic communities in Ovre Heimdalen were completely dominated by insects, and the species distribution of stoneflies, mayflies, and caddisflies was clearly related to the deciduous vegetation along the streams. Expand
The fauna of the exposed zone of Øvre Heimdalsvatn: Methods, sampling stations and general results
TLDR
Densities of G. lacustris, Ephemeroptera, Tipulidae and Plecoptera showed a positive correlation with detritus, and no significant relationship was found for the other taxa. Expand
ASSIMILATION OF ORGANIC MATTER BY ZOOPLANKTON1
A method for direct measurement of percentage of assimilation of organic matter by zooplankton that does not require the quantitative recovery of feces and can be adapted for use in the field as wellExpand
Calorific, chemical and physical values of potential duck foods
Summary Calorific values of thirty-three species of aquatic invertebrates, representing various life stages, from small prairie wetlands are given. The values for twenty-seven species are new toExpand
Preliminary investigations on the influence of temperature on food assimilation by rainbow trout Salmo gairdneri Richardson
TLDR
The technique and computations used to document differences in rainbow trout ability to assimilate useable energy from food organisms at three different water temperatures are described and possible reasons are discussed. Expand
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