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Fish vs. Prawn — What's the Difference?

By Maham Liaqat & Fiza Rafique — Updated on March 20, 2024
Fish are diverse aquatic vertebrates with gills and fins, inhabiting a wide range of water bodies, while prawns are crustaceans with exoskeletons and ten legs, commonly found in fresh and salt waters.
Fish vs. Prawn — What's the Difference?

Difference Between Fish and Prawn

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Key Differences

Fish are a vast and diverse group of aquatic animals, characterized by their vertebrate structure, gills for breathing, and fins for movement. They range from tiny species like the Paedocypris to massive ones like the whale shark. Prawns, on the other hand, belong to the crustacean family, distinguished by their hard exoskeleton, segmented body, and ten legs, and are usually smaller in size compared to most fish.
While fish primarily rely on their fins for locomotion and have a streamlined body to navigate through water, prawns move by flexing their abdomen and tail, often using their legs for walking on the seabed. This difference in mobility highlights the distinct evolutionary paths these two groups have taken.
Fish are found in a variety of water environments, from deep oceans to shallow streams, adapting to a wide range of conditions. Prawns, however, are more commonly found in calmer waters such as lagoons, lakes, and rivers, where they can hide and seek food on the bottom.
The respiratory systems also differ significantly; fish use gills to extract oxygen from water, whereas prawns breathe through feather-like gills located beneath their carapace. This anatomical distinction underscores the different adaptations to aquatic life between the two.
Fish reproduction varies widely, with some laying eggs and others bearing live young, showcasing a vast array of reproductive strategies. Prawns typically lay eggs, which hatch into larvae that undergo several developmental stages before reaching adulthood, reflecting a more uniform reproductive process.
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Comparison Chart

Classification

Vertebrates
Crustaceans

Body Structure

Streamlined body with fins
Segmented body with exoskeleton and ten legs

Habitat

Diverse: oceans, rivers, lakes, streams
Mainly calm waters: lagoons, lakes, rivers

Locomotion

Fins for swimming
Abdomen and tail flexing, legs for walking

Respiration

Gills
Feather-like gills under carapace

Reproduction

Varied: egg-laying and live-bearing
Mainly egg-laying with larval development stages

Compare with Definitions

Fish

Aquatic vertebrates with gills and fins.
The clownfish is known for its vibrant colors.

Prawn

A type of small to medium-sized shellfish.
Prawns are a popular choice for seafood dishes.

Fish

A member of a diverse group of organisms.
Salmon migrate upstream to spawn.

Prawn

Used in cuisines worldwide.
Prawn curry is a flavorful dish enjoyed in many countries.

Fish

Used for food by humans and other animals.
Grilled fish is a healthy dinner option.

Prawn

Characterized by a segmented body and exoskeleton.
The prawn molts its exoskeleton as it grows.

Fish

Symbolic in various cultures.
The fish symbolizes abundance in some traditions.

Prawn

Caught both in the wild and farmed.
Prawn farming has become a significant industry.

Fish

A target in recreational and commercial fishing.
He caught a large bass fish yesterday.

Prawn

Often confused with shrimp in some regions.
In some places, 'prawn' and 'shrimp' are used interchangeably.

Fish

Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups.

Prawn

Prawn is a common name for small aquatic crustaceans with an exoskeleton and ten legs (which is a member of the order decapoda), some of which can be eaten.The term "prawn" is used particularly in the United Kingdom, Ireland, and Commonwealth nations, for large swimming crustaceans or shrimp, especially those with commercial significance in the fishing industry. Shrimp that are present in this category often belong to the suborder Dendrobranchiata.

Fish

A person who is strange in a specified way
He is generally thought to be a bit of a cold fish

Prawn

Any of various shrimps, especially one that is large or inhabits fresh water.

Fish

A flat plate that is fixed on a beam or across a joint in order to give additional strength.

Prawn

The flesh of a prawn, used as food.

Fish

Catch or try to catch fish, typically by using a net or hook and line
He was fishing for pike
I've told the girls we've gone fishing

Prawn

To fish for prawns.

Fish

Search by groping or feeling for something concealed
He fished for his registration certificate and held it up to the policeman's torch

Prawn

A crustacean of the suborder Dendrobranchiata.

Fish

Mend or strengthen with a fish.

Prawn

(Commonwealth) A crustacean, sometimes confused with shrimp.

Fish

Join (rails in a railway track) with a fishplate.

Prawn

Synonym of butterface: A woman with an attractive body but an unattractive face.
She's a prawn!

Fish

Any of various jawless aquatic craniates, including the lampreys and hagfishes.

Prawn

A fool, an idiot.

Fish

The flesh of such animals used as food.

Prawn

Alternative form of porn.

Fish

(Informal) A person, especially one considered deficient in something
A poor fish.

Prawn

(intransitive) To fish for prawns.

Fish

To catch or try to catch fish.

Prawn

Any one of numerous species of large shrimplike Crustacea having slender legs and long antennæ. They mostly belong to the genera Pandalus, Palæmon, Palæmonetes, and Peneus, and are much used as food. The common English prawn is Palæmon serratus.

Fish

To look for something by feeling one's way; grope
Fished in both pockets for a coin.

Prawn

Any of various edible decapod crustaceans

Fish

To seek something in a sly or indirect way
Fish for compliments.

Prawn

Shrimp-like decapod crustacean having two pairs of pincers; most are edible

Fish

To catch or try to catch (fish).

Prawn

Fish for prawns

Fish

To catch or try to catch fish in
Fish mountain streams.

Fish

To catch or pull as if fishing
Deftly fished the corn out of the boiling water.

Fish

Any animal (or any vertebrate) that lives exclusively in water.

Fish

(Newfoundland) Cod; codfish.

Fish

(uncountable) The flesh of the fish used as food.
The seafood pasta had lots of fish but not enough pasta.
Though Lena is a vegetarian, she doesn't have any problem with eating fish.

Fish

(uncountable) A card game in which the object is to obtain cards in pairs or sets of four (depending on the variation), by asking the other players for cards of a particular rank.

Fish

A woman.

Fish

An easy victim for swindling.

Fish

A bad poker player. Compare shark (a good poker player).

Fish

A makeshift overlapping longitudinal brace, originally shaped roughly like a fish, used to temporarily repair or extend a spar or mast of a ship.

Fish

(nautical) A purchase used to fish the anchor.

Fish

A torpedo self-propelled explosive device.

Fish

(zoology) A paraphyletic grouping of the following extant taxonomic groups:

Fish

Class Myxini, the hagfish (no vertebrae)

Fish

Class Petromyzontida, the lampreys (no jaw)

Fish

Within infraphylum Gnathostomata (jawed vertebrates (also including Tetrapoda))

Fish

(cartomancy) The thirty-fourth Lenormand card.

Fish

(prison slang) A new (usually vulnerable) prisoner.

Fish

A male homosexual; a gay man.

Fish

A period of time spent fishing.
The fish at the lake didn't prove successful.

Fish

An instance of seeking something.
Merely two fishes for information told the whole story.

Fish

(obsolete) A counter, used in various games.

Fish

(intransitive) To hunt fish or other aquatic animals in a body of water.
We went fishing for crabs by the pier.
She went to the river to fish for trout.

Fish

(transitive) To search (a body of water) for something other than fish.
They fished the surrounding lakes for the dead body.

Fish

To use as bait when fishing.

Fish

(intransitive) To (attempt to) find or get hold of an object by searching among other objects.
Why are you fishing through my things?
He was fishing for the keys in his pocket.

Fish

To talk to people in an attempt to get them to say something, or seek to obtain something by artifice.
The detective visited the local pubs fishing around for more information.
The actors loitered at the door, fishing for compliments.

Fish

Of a batsman, to attempt to hit a ball outside off stump and miss it.

Fish

To repair (a spar or mast) by fastening a beam or other long object (often called a fish) over the damaged part (see Noun above).

Fish

To hoist the flukes of.

Fish

A counter, used in various games.

Fish

A name loosely applied in popular usage to many animals of diverse characteristics, living in the water.

Fish

An oviparous, vertebrate animal usually having fins and a covering scales or plates. It breathes by means of gills, and lives almost entirely in the water. See Pisces.

Fish

The twelfth sign of the zodiac; Pisces.

Fish

The flesh of fish, used as food.

Fish

A purchase used to fish the anchor.

Fish

To attempt to catch fish; to be employed in taking fish, by any means, as by angling or drawing a net.

Fish

To seek to obtain by artifice, or indirectly to seek to draw forth; as, to fish for compliments.
Any other fishing question.

Fish

To catch; to draw out or up; as, to fish up an anchor.

Fish

To search by raking or sweeping.

Fish

To try with a fishing rod; to catch fish in; as, to fish a stream.

Fish

The flesh of fish used as food;
In Japan most fish is eaten raw
After the scare about foot-and-mouth disease a lot of people started eating fish instead of meat
They have a chef who specializes in fish

Fish

(astrology) a person who is born while the sun is in Pisces

Fish

The twelfth sign of the zodiac; the sun is in this sign from about February 19 to March 20

Fish

Seek indirectly;
Fish for compliments

Fish

Catch or try to catch fish or shellfish;
I like to go fishing on weekends

Common Curiosities

Do prawns swim like fish?

Prawns do swim, but their method of locomotion, involving flexing their abdomen and tail, differs from the fin-based swimming of fish.

What's the difference between prawns and shrimp?

Prawns and shrimp are similar but belong to different suborders and can be differentiated by their gill structure, leg size, and the way their body segments overlap.

Can fish and prawns live in the same environment?

Yes, many fish and prawns coexist in similar aquatic environments, though their specific habitats and behaviors may differ.

How do fish reproduce?

Fish reproduction varies widely, with some species laying eggs and others bearing live young, known as viviparity.

What are the economic benefits of prawn farming?

Prawn farming contributes significantly to the economy by providing a source of income, employment, and meeting the high demand for seafood.

Can prawns be found in freshwater?

Yes, some prawn species thrive in freshwater environments, while others prefer brackish or saltwater habitats.

What do prawns eat?

Prawns are generally omnivorous, feeding on a diet of algae, plankton, and small particles of organic matter.

How do fish and prawns breathe underwater?

Fish breathe through gills that extract oxygen from water, while prawns have feather-like gills beneath their carapace for respiration.

Are all fish edible?

While many fish are edible and nutritious, some are toxic or endangered and should not be consumed.

Are there endangered fish species?

Yes, overfishing, habitat destruction, and pollution have led to the endangerment of many fish species globally.

How do fish sense their environment?

Fish sense their environment through a combination of lateral lines, which detect movement and vibration, and their keen sense of smell and vision.

Is it easy to differentiate between a fish and a prawn?

Yes, their distinct body structures, such as the presence of fins in fish and the segmented exoskeleton in prawns, make them easily distinguishable.

Do prawns have a significant role in the aquatic food chain?

Yes, prawns serve as both predators and prey in aquatic ecosystems, playing a crucial role in maintaining ecological balance.

Can fish and prawns be kept together in an aquarium?

It depends on the species, as some fish might prey on prawns, while others coexist peacefully, requiring careful selection and monitoring.

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Author Spotlight

Written by
Maham Liaqat
Co-written by
Fiza Rafique
Fiza Rafique is a skilled content writer at AskDifference.com, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.

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