Bluefin tuna power across the Atlantic much more often than scientists had expected, a find that could make life messy for fishing-rights negotiators.
The greater mobility of bluefins is just one insight to come from a new generation of fish-tagging experiments, explains Barbara A. Block of Stanford University. Scientists used to rely on tags that merely identify the animal. Now, electronic tags can report much about what a fish does between tagging and recapture. In the Aug. 17 Science, Block and her colleagues release results for Atlantic bluefins wearing two new models.