By John McDevitt

PHILADELPHIA (CBS) - Many fishing along area rivers say they do it for the sport. They catch the fish, maybe take a video or picture, then throw it back.

One of them, Al Smith, who is from North Philadelphia, proudly showed off a recent catch he documented on video using his smartphone.

“A flat head cat fish,” said Smith.

And how big is that?

“Oh, I don’t know, about 20 pounds, something like that. So that [is] the type of size of fish that is in the water.”

Others actually eat the fish they catch, like Michael Casurra.

“I have caught catfish in the Delaware. I have eaten those before,” said Casurra.

The Pennsylvania Fish and Boat Commission has a consumption advisory table that has the water body listed, the area under advisory, the species & and how much can be consumed per month due to possible contaminants such as PCB or Mercury.

For more information visit: fish.state.pa.us/fishpub or fish.state.pa.us.