There are two key spawning locations for the Bluefin. In North America, bluefin spawn mostly in the Gulf of Mexico and along the Florida straits. In the east, the tuna spawn in the Mediterranean Sea. While this species lives all over the Atlantic, it has been found that only 10% of Bluefin make their way from one spawning site to the other over their life time. The fish in the Gulf of Mexico reach maturity at around 12 years old and average over 600 pounds. The fish in the Mediterranean usually reach maturity around 4 or 5 years old and tend to be much smaller. The diets and conditions of the Bluefin have a huge impact on their habits and size, but it is the same fish no matter what side of the ocean it grows up on.
Yes at least in the Atlantic Ocean, technically there are 3 locations, including one more in the Pacific. Although the bluefin tuna is found throughout the Atlantic and Pacific in subtropical and temperate ocean waters, it spawns in only two places. The bluefin tuna is oviparous, meaning it lays eggs which then hatch. In the Atlantic they are found in only two areas the Mediterranean (June and August) and the Gulf of Mexico (April-June). In the Pacific spawning occurs near the Philippines. Spawning has not been observed so not much is known about it.
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