Tagged Tuna Reveal Migration Secrets

High-tech electronic tags are unveiling new insights into the migration and spawning secrets of Atlantic bluefin tuna, according to a pair of new studies. The work could lead to better protections for the commercial species, which many experts say is declining worldwide (see related photos of the demand on tuna fisheries). In one report, appearing in the journal Hydrobiologia, a team of international scientists documented two giant bluefins tagged within minutes of each other off the coast of Ireland. The two fish swam to opposite sides of the Atlantic Oceanu"ending up more than 3,000 miles (5,000 kilometers) apart. One of the fish traveled 3,730 miles (6,000 kilometers) southwest to waters about 186 miles (300 kilometers) northeast of Cuba. The other remained in the eastern Atlantic and moved off the coasts of Portugal...