Listing
Jan 11, 1991
Jan 11, 1991 Listing (Not Substantial)
ETWP; Notice of 90-Day Finding on Petition to List the Pacific Fisher as Endangered; 56 FR 1159 1161
- Publication type: 90 day petition finding
Item 1
FWS Focus
Overview
Characteristics
Overview
The fishers of the Southern Sierra Nevada Distinct Population Segment are medium-sized mammals that are classified in the same family as weasels, mink, martens and otters. These fishers have a light brown to black fur coat, with white patches on its chest. They have a broad head, pointy snout, bushy tail and small ears. Males are larger than females. They are most often found in forested areas, with a large tree canopy cover that contain a mix of conifer and California black oak trees. They are mostly found on federal lands managed by the U.S. Forest Service and National Park Service.
They face several threats, including wildfire, climate change climate change
Climate change includes both global warming driven by human-induced emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. Though there have been previous periods of climatic change, since the mid-20th century humans have had an unprecedented impact on Earth's climate system and caused change on a global scale.
Learn more about climate change , tree mortality, predation, toxicants, collisions with vehicles and potential effects associated with small population size. The Southern Sierra Nevada Distinct Population Segment of fisher was listed as endangered in 2020.
Scientific Name
Pekania pennanti
Common Name
Fisher
FWS Category
Mammals
Identification Numbers
Characteristics
Characteristic category
Food
Characteristics
Food
Fishers are opportunistic hunters and primarily eat squirrels, mice and birds. New research shows the fishers also eat fungi.
Characteristic category
Life Cycle
Characteristics
Life Span
Fishers live to be about 10 years of age.
Reproduction
The breeding period for the Southern Sierra Nevada Distinct Population Segment of fisher begins in late February and lasts through April. Females give birth about one year later in dens. While fishers tend to stay in a single den, some females may use five or more den sites throughout a season. Once weaned, the kits stay with the female, utilizing multiple structures within the female’s home range, until juveniles disperse in the fall or winter following their birth. Kits become independent of their mother and develop their own home ranges by 1 year of age and leave their home dens around March. Males disperse further than females.
Characteristic category
Physical Characteristics
Characteristics
Color & Pattern
These fishers have a light brown to black fur coat, with white patches on its chest. They have a broad head, pointy snout, bushy tail and small ears.
Size & Shape
The fishers of the Southern Sierra Nevada Distinct Population Segment are medium-sized mammals that are classified in the same family as weasels, mink, martens and otters. Males are larger than females.
Characteristic category
Habitat
Characteristics
Habitat
They are most often found in forested areas with a large tree canopy cover that contain a mix of conifer and California black oak trees. They are mostly found on federal lands managed by the U.S. Forest Service and National Park Service. The species has been sighted in Mariposa, Madera, Fresno, Tulare and Kern counties, California.
Throughout their range, fishers use tree cavities for denning, and they select denning and resting sites in forests that have high canopy cover, a lot of snags and downed wood.
Geography
Characteristics
Range
These fishers are found in low- to mid-elevation forests from the Tuolumne River in Yosemite National Park, south to the Greenhorn Mountains within Sequoia National Forest. The species has been sighted in Mariposa, Madera, Fresno, Tulare and Kern counties, California.
Timeline
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