Fisher
(Martes pennanti)
Webpage Author: Michael Sedon
The fisher one of the largest
members of the weasel family disappeared from
Fishers in the state of
Fishers are
similar to the much smaller weasels. They have a long body with short legs.
Adults range in length from about 2.5 to 4 feet. Males weigh about 7 to 13
pounds, females about 3 to 5.5 pounds. The fisher has a broad and flat
head with a sharp
pronounced muzzle. The eyes on a fisher face forward and the ears are
rounded (Pack and Cromer 1981). The fur on the fisher ranges from 1 inch
to 2.75 inches long and the color ranges from light brown to dark brown.
It also has a large bushy tail. Fishers have five toes on all four feet
with retractable claws like a cat. They can also rotate their hind paws almost
180 degrees allowing them to come down trees head first like a squirrel and
grasp limbs (Wallace 1985). Fishers are predators with a diverse diet that
includes birds, porcupines, snowshoe hare, squirrels, mice, shrews, voles,
reptiles, insects, deer carrion, vegetation and fruit. The breeding season for
fisher begins in February and ends in the middle of April. Litter sizes
can range anywhere from 1 to 4 but have been known to get as high as 5 or 6
(Powell 1993).
The primary threat is the
loss and fragmentation of fisher habitat, which is due to timber harvest,
roads, urban development, recreation, and stand-replacing fire (Berg
1982). Other factors cited include poaching and incidental capture and
injury, predation, mortality by vehicle collision, limited population size, and
isolation of populations (Halfpenny 1995).
Habitat Requirements:
The requirements for habitat for the fisher are
continuous forested areas, since they very rarely ever travel into unforested areas (Hagmeier 1956). It has long
been thought that coniferous forests were needed for the survival of fishers
but it seems that, in
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Mustelidae
Genus: Martes
Species: pennanti
Common Names: fisher, tree
fox, and black cats
Berg, W. E. 1982. Reintroduction of fisher, pine marten and river otter.
Pages 159–173 in G. C. Sanderson,
editor.
Hagmeier, E. M. 1956. Distribution of marten and fisher in
Halfpenny, J. C., R. W.
Thompson, S. C. Morse, T. Holden, and P. Rezendes. 1995. Snow tracking. Pages
91–163 in
W. J.
Zielinski and T. E. Kucera,
eds. American marten, fisher, lynx, and wolverine: survey methods for their
detection.
http://www.pgc.state.pa.us/pgc/cwp/browse.asp?a=498&bc=0&c=70024
http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Martes_pennanti.html