You grow it in a white tank and it stays transparent but when you grow it in a black tank, it turns bluish, not black.
Original in situ ( in its natural place while swimming underwater) documentary photography by nelson gerundo on July 5, 2009 (Sunday) starting at 4:00:04 PM in Batangas, the Philippines, of two 35g indoor clear water RAS reared Penaeus vannamei from a white-painted RAS tank (ABOVE) and a black-painted RAS Tank (BELOW) in the Philippines.
Not for sale ... it's free 🙂
FYI
Nelson