Journal
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 78, Issue 11, Pages 1586-1596Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfas-2020-0313
Keywords
-
Categories
Funding
- Academy of Finland [286261]
- Finnish Ministry of Agriculture and Forestry
- European Maritime and Fisheries Fund [43521]
- Academy of Finland (AKA) [286261, 286261] Funding Source: Academy of Finland (AKA)
Ask authors/readers for more resources
The study found that adfluvial brown trout's fitness-proxies are affected by predation and natural selection in different fishing environments, with predation mortality being negatively size-dependent and capture probability being positively length- and condition-dependent. Angling behaviors may lead to evolution in behaviors and life histories, offspring of wild fish showed slower growth rates compared to crossbred strains, indicating significant heritable scope for artificial selection on life-history traits.
Wild, adfluvial brown trout (Salmo trutta) are iconic targets in recreational fisheries but also endangered in many native locations. We compared how fishing and natural selection affect the fitness-proxies of brown trout from two pure angling-selected strains and experimental crosses between an adfluvial, hatchery-bred strain and three wild, resident strains. We exposed age 1+ parr to predation risk under controlled conditions where their behaviour was monitored with PIT-telemetry, and stocked age 2+ fish in two natural lakes for experimental fishing. Predation mortality (16% of the fish) was negatively size-dependent, while capture probability, also reflecting survival, in the lakes (38.9% of the fish) was positively length- and condition- dependent. Angling-induced selection against low boldness and slow growth rates relative to gillnet fishing indicated gear-dependent potential for fisheries-induced evolution in behaviours and life-histories. Offspring of wild, resident fish showed slower growth rates than the crossbred strains. Strain effects suggested significant heritable scope for artificial selection on life-history traits and demonstrated that choices of fish supplementation by stocking may override the genetic effects induced by angling.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available