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Whose Fish Are They Anyway?

Bluefin tuna abundance in the western Atlantic declined during the late 1970s and 1980s to levels that were a mere 20% of the abundance in the early 1970s. As
 Magnuson
 et al.
 explain in their Perspective, mixing of fish from different regions of the Atlantic at feeding grounds complicates the management and the rebuilding of western Atlantic fish stocks. Attempts to rebuild abundance in the western Atlantic are not independent of fishing activities in the east, where overfishing still occurs. With electronic archival and pop-up tags,
 Block
 et al.
 have tracked bluefin movements across and around the Atlantic and conclude that the degree of mixing at feeding grounds is higher than previously believed, complicating management strategies still further.