Characterizing demography of fisheries bycatch is essential to understanding impacts on populations of long‐lived, low‐fecundity species. Northern Fulmars ( Fulmarus glacialis rogersii) represent >50% of seabird bycatch in U.S. groundfish and halibut fisheries in the North Pacific. Using specimens collected by federal observer programs, we document the sex, age class, and body condition of 1,089 fulmars collected between 2004...