The chances of getting a mated pair is not likely. For one, you can't tell male from female.
And, Cranberry is right, to some extent...anything bigger than themselves is "not likely" to be eaten, but you'd be surprised.
Anglers don't have good common sense when it comes to "hey, that fish looks alot bigger than me, I better not eat it!"
Anglers will commonly eat fish, much bigger than they can handle. If things go right, the Angler will expunge then fish. If things don't go right (which happens more often than not), the Angler will die.