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Production and yield of stocked rainbow trout salmo gairdneri in the sundtjerna lakes heidal norway summer 1980



Production and yield of stocked rainbow trout salmo gairdneri in the sundtjerna lakes heidal norway summer 1980



Fauna (Oslo) 35(3): 114-120



In shallow lakes O2 depletion in winter can make fish survival impossible. A method to crop the food production in such lakes is the stocking of rainbow trout of age-group I with a size of 50-100 g. In 1 season rainbow trout can reach sizes of 300-500 g. depending on stocking densities and the environmental conditions. Nordre Sundtjerna was stocked at 24 fish/ha with rainbow trout of mean size 53 g. Sondre Sundtjern was stocked with only 7 fish/ha to estimate the growth potential. A descent of 9 fish from the upper N. Sundtjern to the lower S. Sundtjern was computed under the assumption that the instantaneous natural mortality rate, M, was 0.194 for both lakes. Specific growth rates obtained for the resulting mean biomasses for the 2 lakes showed a good relationship to other results and a model given specific growth rate (G) as a function of the logarithm of the mean biomass (.hivin.B) gave the relationship G = 2.97 - 0.176 in .hivin.B. The production and the potential yield increased with stocking density and the carrying capacity should be interpreted as the maximum weight of biomass which will support with an established minimum rate of growth. The economic return declined with increased stocking density.

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