A type of large saltwater fish found in tropical and subtropical Atlantic waters, also called the tilefish.
From Spanish blanco 'white' + -illo (diminutive suffix in Spanish). The fish was named for its whitish coloring or belly.
The blanquillo is a deep-sea fish that lives in the twilight zone of the ocean where almost no light penetrates, and it took modern fishing technology to even discover it lived there—it's one of thousands of fish species we've basically ignored until we had ships capable of dragging the ocean floor.
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