How to Grill Fish and Shellfish on a BBQ Grill

Grilling seafood on a BBQ can seem intimidating, but with a few key techniques, you can achieve perfectly cooked, smoky, and flavorful fish and shellfish right in your backyard. Learning how to grill seafood on a bbq is all about managing the delicate nature of the proteins and using the fire to your advantage. This guide will walk you through the essential steps, from prep to plate, so you can serve impressive grilled seafood with confidence.

Preparing Your Grill and Seafood

The foundation of non-stick, successful seafood grilling happens before the food ever touches the grates. Start with a scrupulously clean grill. Any old debris will cause sticking. Heat your grill to a medium-high heat (around 400-450°F) to ensure a good sear. Just before cooking, vigorously scrub the hot grates with a grill brush, then oil them. Dip a folded paper towel in a high-heat oil (like canola or avocado oil), grab it with tongs, and rub it over the grates. This creates a temporary non-stick surface.

For the seafood itself, pat it completely dry with paper towels. Moisture is the enemy of browning and promotes sticking. Then, season it generously. For fish, a simple coating of oil, salt, and pepper is often perfect. Shellfish like shrimp or scallops benefit from a light marinade or dry rub. You can find inspiration for flavorings in our guide to BBQ Sides, Sauces, Dry Rubs and Grilled Vegetables, including how to craft your own dry rub from scratch.

Essential Grilling Techniques for Fish

Fish requires a gentle touch. The two primary methods are direct and indirect grilling.

Direct Grilling for Fillets and Steaks

This method is best for skin-on fillets (like salmon or snapper) or sturdy steaks (like tuna or swordfish). Place the fish skin-side down (if applicable) directly over the heat. The key is to let it cook undisturbed until it releases naturally from the grate. Trying to move it too soon will tear the flesh. For skin-on fish, the skin will crisp up and act as a barrier. Cook until the flesh is mostly opaque, then carefully flip to finish the top side for just a minute or two. For a detailed look at managing heat zones, see our broader BBQ Recipes resource.

Indirect Grilling for Whole Fish

For a whole, dressed fish, use indirect heat. Place the fish on the cooler side of the grill, away from the direct flames or coals. Close the lid to create an oven-like environment that cooks the fish through gently and evenly without burning the exterior. This method is excellent for larger, whole fish like branzino or trout.

Grilling Shellfish on the BBQ

Shellfish are often quicker and more forgiving than fish on the grill.

• Shrimp: Use jumbo or extra-large shrimp (21/25 or 16/20 count). Peel and devein them, leaving the tails on for a handle if you like. Skewer them to prevent them from falling through the grates, or use a grill basket. Grill over direct heat for 2-3 minutes per side until pink and opaque.
• Scallops: Use dry-packed sea scallops. Pat them extremely dry. Grill over high direct heat for 2-3 minutes per side to get a beautiful caramelized crust. They should be just firm to the touch.
• Lobster Tails: Use kitchen shears to cut through the top shell and loosen the meat. Brush with oil or butter and grill flesh-side down first over direct heat, then finish shell-side down. The meat will be opaque and firm when done.
• Clams, Mussels, and Oysters: Place them directly on the hot grate over direct heat. Close the lid. They are done when the shells pop open, which usually takes 5-10 minutes. Discard any that do not open.

How to Know When Seafood Is Done

Overcooking is the most common mistake when learning how to grill seafood on a bbq. Use these visual and tactile cues, backed by a thermometer for certainty.

*As recommended by the USDA. Always let fish rest for a few minutes after grilling; the temperature will continue to rise slightly. For comprehensive guidelines, visit our BBQ Food Safety article.

Flavoring and Serving Grilled Seafood

Seafood’s delicate flavor pairs beautifully with simple enhancements. A squeeze of fresh lemon or lime after grilling is a classic finish. Herb-based sauces like chimichurri or a light vinaigrette are excellent. For a touch of sweetness, a glaze made with a little honey or a brush of homemade barbecue sauce in the last minute of cooking can be wonderful on salmon or shrimp. Serve your grilled seafood with complementary sides from our collection, such as grilled vegetables or make-ahead side dishes for a complete meal. Explore more inspiration in our Other BBQ Recipes category.

FAQ

How do I keep fish from sticking to the grill?

Ensure your grill grates are very clean, very hot, and well-oiled before adding the fish. Pat the fish completely dry and brush it with oil. Place it on the grill and do not move it until it releases naturally, which usually happens once a crust has formed.

Should I grill fish with the skin on or off?

Grilling with the skin on is often easier. The skin acts as a protective barrier between the delicate flesh and the hot grate, reducing sticking and helping the fillet hold together. The skin also becomes deliciously crispy. If you prefer skinless, just be extra vigilant with your grill prep and use a fish basket or a very thin, flexible spatula.

Can I grill frozen seafood?

It’s best to thaw seafood completely in the refrigerator before grilling. Grilling frozen seafood will cause it to steam and release too much water, preventing proper browning and often leading to sticking and uneven cooking. Plan ahead for proper thawing.

What are the best types of fish for grilling?

Look for firm-fleshed or oily fish that can stand up to the heat. Excellent choices include salmon, tuna, swordfish, mahi-mahi, snapper (with skin on), and arctic char. More delicate, flaky fish like sole or tilapia are better cooked in a grill basket or on a cedar plank.

How long does it take to grill shrimp?

Jumbo shrimp (21/25 count) typically take only 2-3 minutes per side over direct medium-high heat. They cook very quickly, so watch them closely. They are done when the flesh turns pink and opaque all the way through and firms up.