Anyone know anything bout yellowtail and worms

[Ro12]

Ended up on a private boat this morn
Went out to Catalina and caught a yellow
We cleaned it up at my friends house
There was a bunch of worm lookin things in it
Up by the heart area
Didn't think to take a pic of it
Woulda been smart to take one
Then you guys could see what I'm talking about
So I point it out to my friend
He doesn't know if it's normal or not
But he says it's cool as long as we freeze it
He says he's gonna just freeze it and sashimi his fillet
Says if it is worms then that'll kill em
I'm a little unsure
Wanted to sashimi it till I saw what I saw
Looked like half of its guts were worm like
Anyways don't feel like sashimi anymore
Is this normal
Is it safe to eat if I throw it on the grill
Or is that just what their guts look like
Only other yellows I've caught have been on charters
They gutted em for me
And I never payed any attention to the guts
So I got my fillet on ice in the fridge
Not sure what to do with it
Don't wanna feed it to my family till I get some info
Thanks everyone