Widow Rockfish

Widow Rockfish (Sebastes entomelas) is a schooling member of the Scorpaenidae family found along the Pacific coast of North America from Baja California to the Gulf of Alaska. It is a midwater species that forms some of the largest and densest schools among Pacific rockfishes, historically supporting one of the largest groundfish fisheries on the West Coast during the late twentieth century before management measures were introduced to address population declines. Widow Rockfish are named for the somewhat mysterious, transient nature of their large schools, which can appear and disappear from an area over relatively short timescales.

Widow Rockfish are best identified by their bronze coloring, large eyes, and schooling, open-water habits.

• Coloration: bronze to grayish-brown with a coppery sheen
• Eyes: notably large relative to head size
• Mouth: small compared to many other rockfish
• Marking: faint dusky blotch near the base of the pectoral fin
• Size: typically 35-50 cm as adults

They resemble Yellowtail Rockfish but lack the yellow fin tint and have a smaller mouth and more coppery overall tone, useful clues when separating mixed rockfish schools.

Widow Rockfish occur along the eastern Pacific from Baja California to the Gulf of Alaska, typically in open water over the outer continental shelf and slope at depths from about 50 to 400 meters. Unlike many rockfish that stay close to rocky structure, Widow Rockfish spend most of their time well above the seafloor in the water column, often over relatively featureless bottom rather than high-relief reefs. They tend to aggregate at specific depth layers where zooplankton and small prey concentrate, and their schools can shift location seasonally in response to prey availability.

Widow Rockfish are strongly schooling, forming some of the densest aggregations of any Pacific rockfish, sometimes numbering in the thousands. They feed primarily on euphausiids (krill) and other zooplankton, filtering through the water column in coordinated groups rather than hunting individually near structure. Reproduction follows the standard rockfish pattern of internal fertilization and live birth, with females releasing larvae into open water, typically in winter. Their dense schooling behavior made them highly vulnerable to large-scale fishing pressure in the past, and their populations are now managed with catch limits informed by regular stock assessments.