During ,fuIy and early August of lggT, entanglement of juvenile male northern fur seals (calrorhinus ursinus) in marine debris was studied on st. paur rsland, Araska, in the Bering sea. Estimates of entanglement-caused mortality, incidence ofentanglemenE, and the kinds and sizes of debris were determined for seals in 94 roundups.
The proportion of entangled seals obsen¡ed in 1992 was greater than in 1991 but was comparable Èo that obsen¡ed during the previous several years. The entanglement rate since i-9g7 has remained lower than that obse:r¡ed during 1967-96. The proportion of juvenile males obsen¡ed ent,angled in 1-992 was O.2gZ. Although the proport,ion of entangled animals found in fragnnents of trawl webbing increased over that, obsen¡ed in 1gg1, the frequency of occurrence of Èraw1 webbing among entangling debrís in 1992 was about one-harf that obsen¡ed prior to 1998. The proportion ofseals entangled ín other Èlæes of debris did not change.
The L992 studies confirm earlier esÈimates that the annual sun¡ival of seals entangled in small debris is about one-half that of nonentangled seals. Seals from which debris was removed had significantly higher surr¡ival than those which remainedentangled.
During the 1,992 roundups, 10 entangled male seals too large to be part of the entanglement study were captured and the debris was removed.