Safe handling starts the moment the fish is caught

A fish dies quickly once it leaves the water, and the clock on freshness starts immediately. The first rule is simple: keep it cold and keep it clean. A fish that has been handled roughly, left in the sun, or allowed to sit in its own slime will spoil faster and may carry bacteria that heat alone won't kill. The fish you handle safely is the fish that tastes better and is safer to eat.

Start by carrying a cooler with ice or ice packs to the water. As soon as a fish is caught, kill it humanely—a sharp blow to the head or a knife through the brain stem ends suffering and stops the stress hormones that degrade meat quality. Rinse the fish in clean water if you can, then place it on ice immediately. Do not let it sit in a live well or in the sun while you fish.

Key Takeaways

  • Ice a fish within minutes of catching it, and keep it below 40°F until you cook it or freeze it.
  • Clean your hands, knife, and cutting board with soap and hot water before and after handling raw fish to prevent cross-contamination.
  • Gut and scale a fish as soon as possible after killing it, or ask your fishmonger to do it if you are buying whole fish.
  • Store raw fish on the bottom shelf of the refrigerator so drips cannot contaminate other foods, and use it within one to two days.
  • Thaw frozen fish in the refrigerator overnight, never at room temperature, to slow bacterial growth.

Cleaning and gutting fish at home

If you are cleaning your own catch, do it as soon as you get home. Lay the fish on a clean cutting board—one you use only for raw fish, or one you will wash thoroughly afterward. A sharp fillet knife or gutting knife makes the work faster and safer than a dull blade that can slip.

To gut a fish, make a shallow cut from the vent (the small opening near the tail) up to the gills. Do not cut into the organs inside—you want to remove them whole. Reach in and pull out the innards, then rinse the cavity under cold running water. Scrape away any dark membrane along the backbone with the edge of your knife. If you are scaling the fish, do that before gutting: hold it by the tail and scrape a knife or scaler from tail to head, working against the direction the scales lie. Rinse well.

Dispose of the guts and scales in a sealed bag in the trash, or bury them away from your home if you are in a rural area. Do not leave them in the sink or on the counter. Wash your hands, knife, and board with hot soapy water as soon as you finish.

Preventing cross-contamination in your kitchen

Raw fish can carry bacteria like Listeria and Vibrio that do not always show up as obvious spoilage. The safest approach is to treat raw fish the way you would treat raw chicken: assume it can contaminate anything it touches.

Use a cutting board reserved for raw fish, or wash your board thoroughly with hot soapy water before and after use. Wash your knife the same way. If you are preparing other foods—salad, bread, cooked vegetables—do that first, then handle the fish. Never let raw fish drip onto ready-to-eat foods. Store raw fish on the lowest shelf of your refrigerator, below everything else, so any drips stay contained.

Wash your hands with soap and warm water for at least 20 seconds after handling raw fish, and wash them again before touching your face or other foods. If you have a cut on your hand, cover it with a bandage and wear a glove over it while handling fish.

Storage times and temperature

A whole fish on ice will keep for two to three days. A gutted fish keeps slightly longer. Fillets keep for one to two days. These times assume your refrigerator is at 40°F or below; check it with a thermometer if you are not sure.

If you are not cooking the fish within that window, freeze it. Wrap it tightly in plastic wrap or freezer paper to prevent freezer burn, then place it in a freezer bag with the date written on it. Frozen fish will keep for three to four months at 0°F or below. Thaw it in the refrigerator overnight—never at room temperature, which allows bacteria to multiply on the surface while the inside is still frozen.

A fish that smells strongly of ammonia, has gray or dull flesh, or feels slimy even after rinsing should be discarded. Trust your senses: if something seems off, it probably is.

Safe cooking temperatures and techniques

Fish is done when the flesh is opaque and flakes easily with a fork, and the thickest part reaches 145°F on a meat thermometer. This temperature kills the bacteria that cause foodborne illness. Do not rely on color alone—some fish stay translucent even when cooked through.

Cooking methods matter less than reaching that temperature. Baking, poaching, pan-frying, and grilling all work. Avoid leaving cooked fish at room temperature for more than two hours; refrigerate leftovers immediately and use them within three to four days. If you are reheating, bring the fish back to 165°F.

Handling fish at the market or fishmonger

If you are buying fish rather than catching it, the same rules apply once it is in your hands. Ask the fishmonger to gut and scale it if you do not want to do it at home. Keep it on ice in your cooler on the way home, and refrigerate it as soon as you arrive. A whole fish from a good fishmonger will have clear eyes, bright red gills, and firm flesh that springs back when you press it.

If you are buying fillets, they should smell like the ocean, not like fish. A strong "fishy" smell means the fish is old. Ask when it was caught or filleted, and buy from a fishmonger who can tell you. Vacuum-sealed packages should have no liquid pooling inside.

Special care for shellfish

Shellfish—clams, mussels, oysters, and scallops—have their own rules. Live clams, mussels, and oysters should close when tapped; discard any that stay open. Store them in a breathable bag in the coldest part of your refrigerator, not in a sealed container or submerged in water. Use them within two days.

Scallops are usually sold already shucked. They should smell sweet and look moist but not waterlogged. Cook them the day you buy them, or freeze them. Shrimp should be firm and smell like salt water, not ammonia. Frozen shrimp thawed in the refrigerator will keep for one day; do not refreeze it.

Frequently Asked Questions

Can I eat raw fish I caught myself?

Only if you are certain it came from clean, cold water and was handled perfectly from the moment it was caught. Parasites and bacteria in freshwater fish are a real risk. Saltwater fish are safer for raw preparation, but even then, freezing at -4°F for seven days or -31°F for 15 hours kills most parasites. Most home freezers do not reach those temperatures reliably.

What should I do if I think I have food poisoning from fish?

Symptoms like nausea, vomiting, diarrhea, or abdominal cramps usually appear within a few hours of eating contaminated fish. Stay hydrated and rest. If symptoms are severe, you cannot keep fluids down, or they last more than a few days, contact a doctor. Keep the fish packaging or leftovers in case a doctor needs to know what you ate.

Is it safe to eat fish that smells a little strong?

A mild ocean smell is normal. A strong ammonia or sour smell means the fish is spoiled and should be thrown away. When in doubt, discard it. The cost of a fish is far less than the cost of a day spent sick.

How do I know if my refrigerator is cold enough?

Buy an inexpensive refrigerator thermometer and place it on a shelf where you store fish. It should read 40°F or below. If it reads higher, adjust the temperature dial or have the refrigerator serviced. A refrigerator that is too warm will not keep fish safe.

Can I refreeze fish that has thawed?

Only if it thawed in the refrigerator and has been there for less than two days. If it thawed at room temperature or in warm water, do not refreeze it. Cook it immediately or discard it.