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This isn't an official term. It's just one that seemed to appear on various message boards a couple of years ago. Basically, it means a tropical storm or hurricane that's neat to admire from a distance, track, etc., but that gets curved out to sea by a trough, low pressure area, etc. without ever being a threat to land. Danielle will almost certainly qualify as a "fish" because of a low that's dropping south in the mid-Atlantic, eroding the subtropical ridge that steers storms to the W or WNW and curving it harmlessly out to sea.