fish

Fish are aquatic vertebrates belonging to the superclass Petromyzontida and classes Actinopterygii (ray-finned) and Sarcopterygii (lobe-finned), characterized by gills, fins, and streamlined bodies adapted for life in freshwater or marine environments. Fish are found across all continents and oceans, with thousands of edible species ranging from small anchovies to large tuna and salmon. Culinary fish vary widely in flavor, texture, and fat content—from delicate white-fleshed fish like sole and cod to rich, oily varieties like salmon, mackerel, and tuna. The quality and availability of fish are influenced by season, geographic origin, and fishing or farming practices.

Fish is broadly categorized into white fish (lean, mild-flavored; e.g., cod, flounder, halibut) and oily/fatty fish (higher in omega-3 fatty acids; e.g., salmon, sardines, mackerel). Firm-textured fish like tuna and swordfish hold their shape during cooking, while delicate fish like sole and halibut require gentler handling. Freshwater fish include trout, pike, and carp, while saltwater varieties dominate commercial fisheries.

Fish is fundamental to cuisines worldwide, prepared through grilling, poaching, steaming, frying, baking, and curing. Mediterranean cuisine emphasizes whole fish and simple preparations with olive oil and herbs; Japanese cuisine features raw fish in sushi and sashimi, as well as grilled and braised preparations. Northern European traditions include smoking and curing (salmon, herring). Asian cuisines utilize fish sauce as a foundational condiment. Fish pairs well with citrus, herbs (dill, parsley, fennel), and light sauces. Cooking methods should match fish type: delicate white fish benefits from gentle poaching or steaming, while oily fish tolerates bolder flavors and high-heat grilling.