ecas
The name of a large flat fish beginning with "P" is a "Plaice."
The fish you are referring to is likely a "sole." Soles are large, flat fish with a distinctive body shape and are commonly found in both freshwater and saltwater environments.
halibut
Halibut ...
Rays
The flat fish you are referring to is called a "ray." This term is often associated with several species of flat fish, including skates and rays within the order Rajiformes. These fish are characterized by their flattened bodies and wing-like pectoral fins, allowing them to glide along the ocean floor.
Turbot
if this is to solve a clue from the guardian crossword the first letter is E and the fith is B
a fish that lives in a flat
Skate. It's like a ray.
it could be either a mantaray or a stingray.
flat fish flounder (also a fish) flying gurnard (large, unusual fish found along the Eastern coast of North America)