FISH ATLASGLOBAL FISH ENCYCLOPEDIA

FISH SPECIES

Flat-bodied Fish

Compare fish with laterally compressed, dorsoventrally depressed or asymmetrical body plans across habitats.

FISH ATLAS / FIELD GUIDEFlat FishIN THIS CHAPTER01 / Characteristics02 / Lifestyle03 / Species04 / Field notes
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01 / NATURAL HISTORY

Characteristics

Flattened body forms represent two distinct evolutionary paths: laterally compressed forms engineered for agility in narrow vertical spaces, and dorsoventrally depressed or asymmetrical forms specialized for living flush against the ocean floor.

  • 01Laterally compressed maneuvering
  • 02Dorsoventrally flattened resting
  • 03Benthic sediment concealment
Hymenocephalus lethonemus 的物种图片
Flat Fish

02 / LIFESTYLE

Lifestyle

Laterally compressed fishes like butterflyfishes and batfishes orient vertically to dart through intricate reef branches, using broad median fins to execute instantaneous, low-radius pivot turns. In stark contrast, depressed rays and asymmetrical flatfishes bury beneath sediment with only elevated eyes exposed, remaining completely motionless until striking passing prey from underneath.

OBSERVATION INDEX

  1. Zero-radius turns in structural cover
  2. Sediment concealment with raised eyes
  3. Undulatory pectoral propulsion on bottoms

03 / SPECIES

Representative species

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Discover representative species illustrating the ecological diversity, morphologies and adaptations of this group.

04 / FIELD NOTES

A closer look

What is the evolutionary difference between a ray and a flounder?

A ray is a cartilaginous fish flattened from top to bottom (dorsoventrally depressed) with eyes on top and gill slits on the underside; a flounder is a bony fish that lies on its side, whose eye migrates during larval development to make the body asymmetrical.

Why do disk-shaped fish like angelfish and discus have tall bodies?

A laterally compressed disc shape provides high vertical stability and exceptional turning agility, allowing fish to twist into narrow vertical crevices and maneuver between tangled roots or coral branches without losing control.