What are the external parts of the fish?

Common external anatomical features of fish include: dorsal fin, anal fin, caudal fin, pectoral fins, ventral fins, gills, lateral line, nares, mouth, scales, and body shape. All fish have external appendages called fins.

What are the external parts of a fish and their function?

External Fish Anatomy

  • Fins. Fins are appendages used by the fish to maintain position, move, steer and stop. …
  • Scales. Scales in most bony fish — most freshwater fish other than gar that have ganoid scales, and catfish which have no scales — are either ctenoid or cycloid. …
  • Gills. …
  • Eyes. …
  • Nares. …
  • Mouth. …
  • Lateral Line. …
  • Vent.

What are the internal and external parts of a fish?

Internal Fish Anatomy

  • Spine: The primary structural framework upon which the fish’s body is built; connects to the skull at the front of the fish and to the tail at the rear. …
  • Spinal Cord: …
  • Brain: …
  • Lateral Line: …
  • Swim (or Air) Bladder: …
  • Gills: …
  • Kidney: …
  • Stomach and Intestines:
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What is the outside of a fish called?

Dorsal – The upper side of a plant, animal or fish. Lateral – From side to side, as in left to right. Caudal – At or near the back of the body. Pelvic – A body area located at the lower end of the body.

What are the parts of fish?

Parts of A Fish

  • Scales.
  • Eyes.
  • Nostril.
  • Mouth.
  • Gill.
  • Dorsal fins.
  • Lateral line.
  • Caudal fin.


What is the function of pelvic fin in fish?

Pelvic fins, located on the bottom of the fish in front of the anal fin, help balance the fish, keep it level, and prevent it from rolling from side to side.

What is the function of scales in fish?

Scales provide protection from the environment and from predators. Fish scales are formed of bone from the deeper, or dermal, skin layer. The elasmobranchs (e.g., sharks) have placoid scales, which are bony, spiny projections with an enamel-like covering.

How many parts are there in fish?

The body of a fish is divided into a head, trunk and tail, although the divisions between the three are not always externally visible. The skeleton, which forms the support structure inside the fish, is either made of cartilage (cartilaginous fish) or bone (bony fish).

What are the different types of fins on fish?

Most fish have two kinds of fins: median and paired. Median fins are single fins that run down the midline of the body. The dorsal fin is a median fin located on the dorsal side of the fish. The anal fin and caudal fin are also median fins.

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Which kind of fish has no internal bone structure?

Shell fish is a type of fish that has external shell, but has no internal bone structure (invertebrates).

What are the 3 classifications of fish?

All the species of the fish found in the world are classified into the following three groups. They are:

  • Agnatha – jawless fish.
  • Chrondrichthyes – cartilaginous fish.
  • Osteichthyes – bony fish. Ray finned group. Lobe finned group.

Do fishes sleep?

While fish do not sleep in the same way that land mammals sleep, most fish do rest. Research shows that fish may reduce their activity and metabolism while remaining alert to danger. Some fish float in place, some wedge themselves into a secure spot in the mud or coral, and some even locate a suitable nest.

What body part does a fish swim with?

Fish swim by flexing their bodies and tail back and forth. Fish stretch or expand their muscles on one side of their body, while relaxing the muscles on the other side. This motion moves them forward through the water. Fish use their back fin, called the caudal fin, to help push them through the water.

What are the main features of a fish?

5 Characteristics That All Fish Have in Common

  • All Fish Are Cold-Blooded. All fish are cold-blooded, which is also called ectothermic. …
  • Water Habitat. Another shared characteristic amongst all fish is that they live in water. …
  • Gills to Breathe. …
  • Swim Bladders. …
  • Fins for Movement.


Do fish have feelings?

Animal Magnetism

Because fishes lack faces like ours, we assume that their mask-like features mean they do not experience feelings. And because fish cannot cry out, we interpret their silence as meaning they do not perceive pain—even as their gasping mouths and flopping fins on a ship’s deck indicate otherwise.

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Do fishes pee?

Fish have kidneys which produce urine containing ammonium, phosphorus, urea, and nitrous waste. The expelled urine encourages plant growth on coral reefs; downstream benefits also include increased fertilization of algae and seagrass, which in turn provides food for the fish.

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