flatfish

Imagine a fish that decided gravity was optional and simply lay down on the seafloor. That's essentially what happens here. These unusual fish, like flounder, halibut, and sole, are known for their very flat bodies and their ability to blend in with the sand or gravel where they live. They are not born this way. They start life looking like ordinary fish, but as they grow, they begin resting on one side, and both eyes end up on that same side. This helps them hide well and wait for prey. If you've ever eaten halibut or sole at a restaurant, you've likely tasted one.

Flatfish are a unique group of fish with bodies that are very thin from side to side, which gives them their flattened look. As adults, they spend most of their lives lying on one side of their body on the seafloor. This adaptation helps them stay nearly invisible against sand, gravel, or mud. Common examples include flounder, halibut, sole, turbot, and plaice.

What makes flatfish truly remarkable is their uneven body plan. Young flatfish begin life looking like typical fish, swimming upright with one eye on each side of the head. As they mature, one eye moves to the other side. This change allows them to lie flat on the seafloor with both eyes facing upward, helping them spot prey and avoid predators. Many species can even change their skin color and pattern to match their surroundings, which makes their camouflage even more effective.

The term "flatfish" is the common name for a group of fish in the scientific order Pleuronectiformes. These fish are found in oceans around the world, from shallow coastal estuaries to deep offshore waters.

From a food perspective, these fish are valued for their delicate flavor and firm, white flesh. They are often pan-fried, baked, or grilled so their natural taste can stand out. So, the next time you see a fillet of sole or halibut, you can picture the unusual sea creature behind it: a fish shaped by life on the ocean floor.