Buying seafood from a market is a high-stakes purchase—one bad batch ruins dinner and wastes money. Learning what to check before you hand over cash separates smart shoppers from those stuck with mushy fish and sulfurous shrimp. Here's exactly what to inspect at the counter.
Eyes and Gills Tell the Real Story
The quickest freshness check happens with your eyes. Fresh whole fish have clear, bulging eyes that look wet and bright, not sunken or cloudy. If the eyes are dull gray or have a milky film, the fish has been sitting for days.
Lift the gill cover gently and look inside. Healthy gills should be bright red or pink, never brown, gray, or slimy. A brown or faded gill means the fish is past its prime. Don't be shy about asking the fishmonger to show you the gills—any reputable market will open one up without hesitation.
The Smell Test Works (And It's Not Rude)
Fresh fish smells like the ocean: briny, clean, almost pleasant. If your nose picks up ammonia, sulfur, or a strong "fishy" funk, walk away immediately. That smell means bacterial growth has already started.
Shellfish like mussels, clams, and oysters should smell salty-fresh. If they reek, they're dead or dying inside their shells. A good seafood counter has minimal odor overall—the smell should be fresh and mild, not overwhelming.
The Flesh and Texture Matter Most
Press your finger gently on the fish flesh. It should spring back immediately, leaving no indentation. If your fingerprint stays visible for more than a second, the proteins have broken down and freshness is gone.
Look at the flesh color. Most fish flesh should be translucent or have vibrant color specific to that species. Dull, gray, or brown-tinged flesh indicates age. For white fish like cod or flounder, the flesh should be opaque white or pale, not yellowed or brown-edged.
Scales should be shiny and tightly attached. If they flake off easily or look dull and dry, the fish is old. Ask the fishmonger to show you a cross-section if you're buying a large piece—the flesh should look moist, not dry or separated from the bone.
Timing and Temperature Checks
Ask when the fish arrived. A good seafood market receives deliveries multiple times per week—ideally 3-4 times. Fish caught 24-48 hours before purchase is excellent. Anything older than 3-4 days starts showing quality decline, even if stored properly.
Check the display case temperature. It should be at or below 32°F (0°C) for whole fish and fillets. If the ice is melting noticeably or the case feels warm to the touch, the cold chain has been broken. Ice pooling at the bottom is normal; fish lying in meltwater is not.
Shellfish-Specific Red Flags
Oysters, clams, and mussels must have tightly closed shells. Open shells that don't snap shut when tapped are dead—discard them immediately. Shells should feel heavy and full of liquid inside, never light or hollow.
Shrimp should have translucent, firm flesh with a slight curve. Mushy texture or a straight appearance means they've thawed and refrozen. The tail should be firmly attached, never loose or missing. If shrimp smell ammonia-like, they're bacterial colonies with legs.
Lobster and crabs must be alive or very recently deceased. Live crabs move their legs and claws with purpose. Dead crustaceans should have been frozen solid immediately after death—never buy a thawed, previously dead crab.
What to Ask the Fishmonger
- "When did this arrive?" (Look for "today" or "yesterday," not "earlier this week")
- "Can I smell it?" (Yes, this is normal)
- "How should I cook this by?" (They'll give you a home-storage timeline: typically 1-2 days for most fish)
Platforms like Mercoly help you find and compare trusted butchers and seafood markets in your area, making it easier to locate reliable vendors with consistent quality standards.
Frequently Asked Questions
Q: How long can I safely store fresh fish at home? Most fresh fish should be used within 1-2 days of purchase when stored at 32°F (0°C). Shelf life depends on the species—lean fish like cod last longer than fatty fish like salmon.
Q: Is frozen seafood really worse than fresh? No. Flash-frozen fish caught on the boat and frozen within hours is often fresher than "fresh" fish sitting in a market case for days. The key is that it was frozen immediately after harvest, not thawed and refrozen at retail.
Q: What's the best day to buy seafood? Buy right after market deliveries arrive—typically Tuesday through Thursday for most shops. Call ahead and ask when they receive shipments to time your visit perfectly.
Start using these checks today: clear eyes, red gills, oceanic smell, and springy flesh separate excellent seafood from mediocre buys.