In most cases, yes, you can legally keep fish you catch in the United States, but only if you hold the right license and the fish clears every applicable rule for species, size, season, and where you caught it. Those rules are set by your state wildlife agency for inland and nearshore waters, and by NOAA Fisheries once you move into federal ocean waters. Breaking them can mean anything from a small fine to federal charges, so the details below are worth knowing before you drop a line.
Do You Need a License to Keep What You Catch
Nearly every state requires anyone 16 or older to carry a valid fishing license, whether you’re a resident or visiting. States sell annual, single-day, and week-long licenses, and most offer separate freshwater, saltwater, and combination options. You can usually buy one through your state wildlife agency’s website, by phone, or at bait shops and sporting goods stores.
Seniors, disabled veterans, active-duty military, and children under 16 are exempt or pay reduced fees in most states. Nearly every state also designates one or more free fishing days each year, typically on a weekend in early June, when no license is required. All other rules, including catch limits, still apply on those days.
Saltwater and Highly Migratory Species
If you fish in federal ocean waters or target species that move between salt and fresh water, like striped bass or salmon, you may need to register with the National Saltwater Angler Registry run by NOAA Fisheries. Registration costs $12 and is valid for one year. You can skip it if your state saltwater license already covers you or if you’re fishing from a federally licensed charter boat.1NOAA Fisheries. National Saltwater Angler Registry
Targeting tunas, swordfish, billfish, or sharks in the Atlantic requires a separate Atlantic Highly Migratory Species Angling Permit from NOAA, which costs $24. A shark endorsement adds a short identification video and quiz.2NOAA Fisheries. Atlantic Highly Migratory Species Angling Permit (Open Access)
What Makes a Fish Legal to Keep
Having a license is just permission to fish. Whether you can actually put a fish in the cooler depends on bag limits, possession limits, and size.
Bag and Possession Limits
A bag limit (sometimes called a daily limit) is the number of a given species you can harvest in one day. A possession limit is how many you can have at any one time, counting fish in your freezer at home and your cooler in the truck. In many states, the possession limit is double the daily bag, though this varies. Some federal fisheries set the limit per vessel rather than per angler: bluefin tuna, for example, is capped at one fish per vessel per trip regardless of how many anglers are aboard.3NOAA Fisheries. Recreational Atlantic Bluefin Tuna Fishery Statuses and Bag Limits
Size Limits
Size rules come in three forms:
- A minimum length limit means the fish must be at least a certain length. This protects juveniles that haven’t yet spawned.
- A maximum length limit means the fish must be below a certain length. This protects the largest, most productive breeders.
- A slot limit means only fish within a specified size window can be kept. Fish smaller or larger go back.
Measure fish at the water as soon as you land them. Anything outside the legal range goes back immediately. Bluefin tuna, for instance, must measure at least 27 inches curved fork length to keep.3NOAA Fisheries. Recreational Atlantic Bluefin Tuna Fishery Statuses and Bag Limits
When the Season Is Closed or the Species Is Off-Limits
Many species have open and closed seasons that shift during the year. Closed seasons generally line up with spawning. Some are short and predictable; others change annually based on stock assessments. Atlantic cod is only open to recreational harvest from September through October in New England federal waters, while bluefish and Atlantic mackerel remain open year-round.4NOAA Fisheries. Recreational Fishing Regulations by Species
Gear and method rules sit alongside seasons. American lobster can be taken by diving but not by recreational traps. Atlantic herring can be taken recreationally only by hook and line. Some species are catch-and-release only, and a handful cannot be targeted or kept at all: Atlantic salmon and Atlantic sea scallops have no recreational harvest permitted in federal waters.4NOAA Fisheries. Recreational Fishing Regulations by Species
Certain fish are entirely off-limits because they’re listed under the Endangered Species Act. Atlantic salmon in the Gulf of Maine and multiple populations of Atlantic sturgeon carry endangered status, and any incidental catch must be released immediately and unharmed. NOAA maintains a directory of threatened and endangered marine species.5NOAA Fisheries. Species Directory – ESA Threatened and Endangered
Where You Catch It Changes What You Can Keep
Fishing rules are not uniform across a state, let alone across the country. The water you’re standing beside, the distance from shore, and who owns the surrounding land all shape which rules apply.
State Waters Versus Federal Waters
State agencies manage fisheries from shore out to about three nautical miles (nine nautical miles off Texas and the Gulf coast of Florida). Beyond that line, federal regulations take over and extend to 200 nautical miles. NOAA Fisheries runs the federal zone in partnership with regional fishery management councils, and the rules for the same species can differ significantly on either side of that boundary.6NOAA Fisheries. Resources for Recreational Fishing in U.S. Federal Waters
Marine Protected Areas and Wildlife Refuges
Special designations can override general fishing rules entirely. Marine protected areas and national wildlife refuges may restrict gear, species, or access. Most waters within the national marine sanctuary system remain open to recreational fishing, but individual sanctuaries have their own restrictions worth checking.7Office of National Marine Sanctuaries. Recreational Fishing
One upcoming change: starting September 1, 2026, the U.S. Fish and Wildlife Service will enforce a ban on lead fishing tackle at eight designated National Wildlife Refuges along the East Coast. At those refuges, simply having lead sinkers in your tackle box can result in a citation. If you fish any national wildlife refuge, check whether non-lead tackle is required before you go.
Private Property
Public waters are generally open to licensed anglers, but reaching them across private land requires the landowner’s permission. Fishing on a private pond or lake without authorization is trespassing in every state. Even when a navigable river runs through private property, access points and bank-fishing rights vary by state law. Get permission in writing when in doubt.
Taking Fish Home: Crossing State Lines
This is where recreational anglers stumble into federal territory without realizing it. The Lacey Act makes it a federal offense to transport across state lines any fish caught in violation of state law. If you kept a fish that was too small, exceeded your bag limit, or was taken during a closed season, driving it home across a state border turns a state citation into a federal case.8Office of the Law Revision Counsel. 16 USC 3372 – Prohibited Acts
Penalties scale with intent and the value of the fish. Civil penalties reach up to $10,000 per violation. If you knew or should have known the fish was taken illegally, criminal penalties apply: up to $10,000 and one year in prison for negligent violations, and up to $20,000 and five years in prison for knowing violations involving fish worth more than $350. The government can also seize the fish and the equipment used, including your boat and vehicle.9Office of the Law Revision Counsel. 16 USC 3373 – Penalties and Sanctions
If you’re fishing near a state line or taking a road trip, make sure every fish in your possession was legally caught where you got it. Ignorance of the local rules is not a defense.
Reporting Catches for Certain Species
Most recreational fishing requires no paperwork beyond your license. For highly migratory species like bluefin tuna, swordfish, and billfish, though, federal rules require you to report your catch within 24 hours of completing your trip. The requirement applies to anyone holding an HMS Angling or Charter/Headboat permit, and reports can be submitted online, through the HMS Catch Reporting app, or by phone. Dead discards of bluefin tuna must be reported too, not just the fish you keep.10NOAA Fisheries. Atlantic Highly Migratory Species Reporting
What Happens If You Break the Rules
State penalties for fishing without a license or violating catch rules vary widely. They typically range from modest fines (starting around $25 for a first offense in some states) up to $2,000 or more for repeat offenders or serious poaching. Many states also impose restitution based on the replacement value of illegally taken fish, which adds up quickly for trophy species.
Federal penalties under the Lacey Act run much higher. Even a negligent violation can bring up to $10,000 in fines and a year of imprisonment. Knowing violations involving the sale or purchase of illegally taken fish worth more than $350 carry fines up to $20,000 and up to five years in prison.9Office of the Law Revision Counsel. 16 USC 3373 – Penalties and Sanctions
License Revocation Can Follow You
Losing your fishing privileges in one state can follow you across the country. Forty-seven states participate in the Interstate Wildlife Violator Compact, which lets member states recognize and enforce license suspensions issued by other states. A revocation in one compact state can block you from legally fishing in any of the other 46. Each state decides independently whether a particular conviction qualifies for suspension under its own laws, so consequences depend on both where you committed the violation and where you want to fish next. If you’ve had a suspension, contact each state’s wildlife agency directly before buying a license there.
Quick Pre-Trip Check
Before every trip, verify five things: your license covers the water you’re fishing, you know the bag and size limits for every species you might encounter, the season is open for those species, you understand any location-specific restrictions, and you have the right gear. Your state wildlife agency publishes a regulation handbook, usually free online and updated annually, that covers all of it in one place. For federal saltwater species, NOAA’s recreational fishing pages break down the rules by region and species.6NOAA Fisheries. Resources for Recreational Fishing in U.S. Federal Waters