Intensive whitefish exploitation: effects on population structure of whitefish Coregonus lavaretus L. and brown trout Salmo trutta L. in a mountain reservoir
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 wh...
| Published in: | Fauna Norvegica |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Norwegian University of Science and Technology
1989-12-01
|
| Subjects: | |
| Online Access: | https://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/6073 |
| Summary: | 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.
|
|---|---|
| ISSN: | 1502-4873 1891-5396 |