Roc - be proactive with "candling" those fillets, If you're eatin' it raw. I have found seal worms in bass fillets, at least twice that I can recall.
I do inspect post skinning and individually as I cut up the individual pieces for sashimi. For the record, I have found a grand total of 1 seal worm in a single striped bass fillet from a fish from the Piscataqua River on the NH/ME border 12 years ago, and not a one in the fish I've been catching here for the past 11 seasons. When I fished LI in late 60s-early 80s, I never did see one.
The cod I fillet keep me in good practice regarding seal worm detection; most cod have at least 1/2 dozen in them, especially when caught inshore. I've even just tossed entire fish out when the count in a single fillet exceeds 15 or so. Regardless, Cod Sushi or Sashimi are never menu items at Chez Roccus...