Intensive whitefish exploitation: effects on population structure of whitefish Coregonus lavaretus L. and brown trout Salmo trutta L. in a mountain reservoir
Main Article Content
Abstract
During the years 1980 - 1986, an intensive whitefish, Coregonus lavaretus, exploitation programme was carried out in the mountain reservoir Goppollen, SE Norway, in an attempt to improve whitefish quality and to reduce interspecific competition between whitefish and brown trout Salmo trutta. For whitefish, individual mean weight increased from 99 g in 1980 to 175 g in 1986, length/weight ratio was improved and empirical growth rate increased. For brown trout, no change in the population structure was observed, indicating that not even intensive whitefish exploitation will create reduced predation pressure on zooplankton, and allow brown trout to utilize planktonic food items in such lakes.
Downloads
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).