Empty seashells
Empty seashells are legal to collect for personal use. Before you pocket one, check that nothing's living inside (a hermit crab or a mollusk) - if it's occupied, leave it.
Foraging / The beach
Texas has 367 miles of public Gulf beach, and beachcombing here is a joy - especially in winter. What you can take depends on the item - and on whether you're on an open beach or in a national seashore.
Empty seashells are legal to collect for personal use. Before you pocket one, check that nothing's living inside (a hermit crab or a mollusk) - if it's occupied, leave it.
Live shells are different. To take a living shellfish (like a live lightning whelk - the state shell), you need a fishing license with a saltwater endorsement, and there are daily limits (no more than 15 live snails, and no more than 2 lightning whelks). When in doubt, take only empties.
At Padre Island National Seashore, you may keep up to a 1-gallon container of empty shells and sea beans per person; commercial collecting is banned.
Don't take live sand dollars or starfish. A live sand dollar is dark and fuzzy; a dead one is the bleached white 'skeleton' - that one's fine.
Sea turtles and their eggs are federally protected - never touch or disturb them (see the Wildlife hub).
On open Gulf beaches, shark teeth, sea beans (drift seeds that float in from the tropics), driftwood, sea glass, and the treasures tangled in sargassum seaweed are generally yours to take. The best hunting is right after a winter 'norther' at low tide, when waves push deep-water finds onto the sand.
Padre Island catch: One catch: at Padre Island National Seashore, only empty shells and sea beans may be collected - not shark teeth, driftwood, or sea glass. The park's rules are stricter than open beaches.
Dunes: Leave the dunes alone - don't dig sand from or trample protected dunes.
Official sources
Open Gulf beaches are managed by the Texas General Land Office; Padre Island National Seashore by the NPS (with stricter rules); live-shell licensing by TPWD.
Caution: Rules differ between open beaches and national parks, and live-shell limits change. Check the rules for the specific beach, and never take a live animal without the right license.