It's totally possible that it was a small monkfish, but definately more likely an oyster toadfish which could be easily confused with it. Monkfish are caught occasionally in the inlet and inshore so it's feasible that one came into the bay.
Speaking of oyster toadfish, was contacted by a marina in the Delaware Bay region that wants us to do a garbage fish tournament for them this year. They don't get sea robin or many dogs but get a ton of oyster toadfish which are sold to a group of distributors for $3.50 a pound. (that's wholesale). The fish go to asian markets and restaurants but he wasn't sure what they market it as. Apparently they get them in the 3-4 pound range regularly as by catch in pound nets. He says they are delicious.
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Brian