Problems with fishers may sometimes arise, but are usually restricted to predatory attacks on domestic birds, rabbits, and free ranging house cats. They reach sexual maturity at one year of age, and females produce their first litter at the age of two.
The young remain with the female until late summer or early fall, at which time they disperse to begin their solitary lives as adults.
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By five months of age, the kits are approximately the same size as the adult female and have begun to learn how to kill their own prey. The female nurses the kits until they reach four months of age. It is believed that the maternal den protects the helpless young from aggressive male fishers and ground predators. Once the kits become mobile, they are moved from the maternal den to one on or below the ground. Maternal dens, typically located in a cavity high in a large tree, are used for the first 8–10 weeks. The young are born helpless, blind, and sparsely furred. Females produce 1 litter each year consisting of 1–4 kits, with an average litter size of 3. The young are born 1–2 months after implantation. The fertilized eggs then implant in the uterine wall and begin normal development. Fishers breed from February to March and exhibit a reproductive strategy called “delayed implantation.” The adult female breeds within days after giving birth, but the fertilized eggs remain dormant in her uterus for the next 10 –11 months.
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