36 CFR § 7.41 - Big Bend National Park.
(a)Fishing; closed waters. Special ponds and springs reserved for species of rare fish are closed to fishing and bait collecting. The taking or release of any form of fish life in these ponds or springs is prohibited except by special authorization by the Superintendent. These ponds and springs will be posted as closed to fishing and bait collecting and molestation.
(2) Use of seine. The use of seines and nets is prohibited except minnow seines no greater than 20 feet in length may be used for taking of minnows for bait.