Posted By: Gulo
Photo Phriday 131 - Fisher - 04/12/24 12:49 PM
I don't have good data on fisher. There were none in Alaska except on the mainland in southeastern, and populations are not legal for trapping in Idaho. These data I gleaned from carcasses that belonged to Idaho Fish and Game from carcasses that were turned in by trappers.
I've caught a few fishers incidentally while wolf trapping. I've never targeted them.
The skulls are easily sexed. Only the males have well-developed sagittal crests. The near one is male; the back one is a female.
Young-of-the-year animals can be determined by the growth plate (the hypophyseal/epiphyseal symphysis). Juvenile on the right, adult with fused bone on the left.
Adults can be sexed easily by size alone. These are femur bones of a female (on top) and a male (bottom). Both are adults.
See the small bump on the far femur and the hole on the near one? This tubercle can be used to determine age also. The far (top) one is an adult and the near femur (bottom) is from a young-of-the-year animal.
Like marten, fisher can be managed by avoiding capture of high numbers of adult females. It is useful to be able to accurately age and sex the harvest for better management. Hope you enjoyed this weeks' Photo Phriday!
I've caught a few fishers incidentally while wolf trapping. I've never targeted them.
The skulls are easily sexed. Only the males have well-developed sagittal crests. The near one is male; the back one is a female.
Young-of-the-year animals can be determined by the growth plate (the hypophyseal/epiphyseal symphysis). Juvenile on the right, adult with fused bone on the left.
Adults can be sexed easily by size alone. These are femur bones of a female (on top) and a male (bottom). Both are adults.
See the small bump on the far femur and the hole on the near one? This tubercle can be used to determine age also. The far (top) one is an adult and the near femur (bottom) is from a young-of-the-year animal.
Like marten, fisher can be managed by avoiding capture of high numbers of adult females. It is useful to be able to accurately age and sex the harvest for better management. Hope you enjoyed this weeks' Photo Phriday!