The energy budget of the brown trout population of ovre Heimdalsvatn

  title={The energy budget of the brown trout population of ovre Heimdalsvatn},
  author={L. Lien},
  • 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
Energetics and survival of virgin and repeat spawning brown trout (Salmo trutta)
Smaller virgin spawners of a stunted population of brown trout (Salmo trutta) had higher specific energy content than repeat spawners, indicating that once maturation has started, the trout does notExpand
A Bioenergetic Analysis of Factors Limiting Brown Trout Growth in an Ozark Tailwater River
Temperatures and availability of prey were less than required for maximal trout growth, however, prey availability limited trout growth directly, but sub-optimal temperatures probably buffered the effect of this reduced energy consumption by reducing metabolic energy expenditures. Expand
Cannibalism governing mortality of juvenile brown trout, Salmo trutta, in a regulated stream
It is concluded that cannibalism appears to be an important cause of small-fish mortality in this stream, regulating the abundance and size distribution of small trout. Expand
Energy allocation in polymorphic Brown Trout
On average, the energetic investment in gonads relative to soma of first-time spawners in the year of maturation was estimated at 11% in males and 67% in females, but not in males, gonadal energy increased linearly with increasing somatic energy of the fish. Expand
Energetic cost of spawning in male and female Atlantic salmon (Salmo salar L.)
During spawning the energy loss of male soma was higher (35.57%) than that of females (25.00%). Expand
Secondary sexual characters, energy use, senescence, and the cost of reproduction in sockeye salmon
Compared to populations with long freshwater migrations, Bristol Bay sockeye salmon stored less fat before entering fresh water and used lessfat before death, and most development of secondary sexual characters occurred late in maturation, perhaps to forestall deterioration of muscle tissue. Expand
The lake ecosystem of Ovre Heimdalsvatn
On account of the long period of ice cover and the rapid rise in temperature after ice break, many organisms (both planktonic and benthic) showed synchronous development. Expand
Biology of the minnow Phoxinus phoxinus and its interactions with brown trout Salmo trutta in Ovre Heimdalsvatn, Norway
In Ovre Heimdalsvatn, an intensively studied lake, the minnow population has increased rapidly during the last decade and several aspects were found to be different from other studies, e.g. higher age of sexual maturation, lower growth rate, no feeding on plants, and low infection of parasites. Expand
Impacts of reduced Lepidurus arcticus availability on brown trout life history traits in a mountain reservoir
The present findings provide strong evidence that this vulnerable crustacean species can affect the abundance, viability and life history traits of valued resident salmonid populations in oligotrophic alpine lakes and reservoirs exposed to climate- and hydropower-driven changes in water levels and temperature. Expand
Emergence of amphibiotic insects from a floodplain lake in the Usman Forest in the Central Russian forest steppe
  • A. Silina
  • Biology
  • Contemporary Problems of Ecology
  • 2016
In this article the emergence of insects from a floodplain lake of the small Usman River in the Usman Forest (Voronezh oblast) is analyzed. The abundance and frequency of occurrence of 103 speciesExpand


Energy Losses in the Waste Products of Brown Trout (Salmo trutta L.)
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
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
Rates of gastric evacuation in brown trout, Salmo trutta L.
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
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
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
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
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
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