Can we fish there, and are they big fish?

I googled it and yes you can fish at Breckenridge Park.

Yes and yes

Yes and yes.....Woodlawn, Brackenridge and Wheeler Parks and the Earl Scott Pond are stocked approximately once a year with channel catfish that average 9-inches in length. Additionally, Brackenridge is stocked twice each winter with trout that average approximately 8-10 inches. A valid fishing license with a freshwater stamp endorsement is required to take fish or other aquatic life from the public waters of Texas. Recreational fishing licenses and stamp endorsements can be purchased at local sporting goods stores, gun shops, department stores, discount stores, bait and tackle shops, grocery stores or at the local Texas Parks and Wildlife Office, 858 W. Rhapsody.

I see a lot of people fishing...so I think you can...!!

There are big fishes but you are not allowed to fish

Yes you can and yes there are.

No