- Split View
-
Views
-
Cite
Cite
A. L. Jensen, Multiple species fisheries with no ecological interaction: two-species Schaefer model applied to lake trout and lake whitefish, ICES Journal of Marine Science, Volume 48, Issue 2, August 1991, Pages 167–171, https://doi.org/10.1093/icesjms/48.2.167
- Share Icon Share
Abstract
The two-species Schaefer model for species that are captured with the same fishing gear, but which do not interact ecologically, was applied to examine the relation between the maximum sustainable yields for lake trout (Salvelinus namaycush) and lake whitefish (Coregonus clupeaformis) fished together and separately. Lake trout and lake whitefish are two important species in the Laurentian Great Lakes that historically have been Sshed with the same gear. Naturally reproducing lake trout populations have disappeared from most of the Great Lakes, but the lake whitefish supports a large fishery. Application of the logistic surplus production model to lake trout alone does not indicate serious over-exploitation, but applied to lake trout and lake whitefish together indicates that at the total maximum sustainable yield of the two species together, the lake trout is seriously over-exploited and abundance is low. A fishery can be optimized for only one species at a time, and, if several non-interacting species are exploited, some will be over-exploited and some will be under-utilized. One species among several in a multiple species fishery can, in theory, be fished to extinction at the total maximum sustainable yield of the combined species.