There are indications that the larvae of P. swirei .
At least some other hadal fish spend time in the open water at relatively shallow depths , less than 1,000 m ( 3,300 ft ) .
There are indications that the larvae of P. swirei and at least some other hadal fish spend time in the open water at relatively shallow depths , less than 1,000 m ( 3,300 ft ) .