Difference Between Crab and Lobster

People around the world enjoy seafood a lot. Each type of seafood has a different taste and texture. They are rich in nutrients, boost the brain, well for the heart, eases joint pain, increase and maintain good eyesight, gives a flawless skin, etc. and all these are the reason behind their popularity. Fish is the most commonly eaten seafood; every third person has eaten fish at least once in his lifetime.

While fish is common, some other kinds of seafood are enjoyed and liked by many. For Example, Crab, and Lobster, are similar to each other in many ways, but as the name suggests, they are not the same.

Crab vs Lobster 

The main difference between a Crab and a Lobster crab is much larger in physical appearance than a lobster. It also walks differently and has far more species than a lobster. Not only are these, but they are also different in terms of body construction and lifespan. Generally, crabs are much affordable when compared to lobsters.

Crab vs Lobster

The crab has a large body with a short tail, antennae, and claws. They come in different shapes and sizes. There are two types of crabs, true crabs and false crabs. They like to socialize very frequently and are thus known as social creatures that live a lifespan of 4-5 years, but the largest crab can even live up to 100 years.

Lobster is a family member of marine crustaceans. Their body structure is relatively smaller except for its tail, antennae, and claws, which are larger. They don’t live in a group and does not like socially and are a solitary creature. They live a long life of around 100 years and change their color from green or blue into red when cooked.

Comparison Table Between Crab and Lobster 

Parameters of ComparisonCrabLobster
SizeSmaller in sizeLarger in size
ClawsAre smallerAre larger
Number of species6800 species85 species
WalkUsually sidewaysWalk forwards and backward
TailsShort tailsLonger tails

What is Crab?

Crab is a sea animal also eaten as seafood that is enjoyed by many. It is very nutritious as it is high in vitamin B12. There are around 6800 species of Crabs. The largest crab that measures around 12 to 15 feet is known as the Japanese Crab, and the smallest is the pea crab.

Crabs have ten (10) legs, large compound eyes, a hard shell that covers their body and has a narrow body. Normally they live up to 4 years, but some crabs can even live for 100 years. They are omnivores that mean they eat both meat and plant.

Some crabs live in the sea only, even in the ocean, and some particularly live on land. And gender of them can easily be found by looking at their abdomen. And the female crab can even lay around 100 eggs at once. Crabs use their claws and pincers for communication.

The cast is a term used to describe a group of crabs. There are some false crabs (crabs from Anomura) also, such as Hermit and King Crabs, etc. earlier, it was said that they do not suffer pain, but the recent research suggests the opposite t said they also remember their pain.

What is Lobster?

Earlier, lobster was considered as a food or chicken of the poor. Even nowadays, it is served to the prison as it is much cheaper than any other seafood. Naturally, they are not red but only turned when they are cooked. Female lobsters carry the sperm in her and only fertilize her eggs when she wants, and can only do that after she has molted. And they carry their eggs till they are hatched. Their eggs are known as Roe.

They can also turn into cannibals and eat smaller lobsters in times of crisis. They can grow till 4 feet and lives up to 100 years of life. They can be eaten in several ways. And are a great source of protein. If the shell of a lobster is soft, it is considered to be sweet and tender in taste which is also known as shedders, and are caught mostly from July till October.

Their vision is not good, but other senses such as smell and taste are enhanced. There is a limit till only that you can hunt lobsters in a day, but they can also be grown on farms. Their blood is not red but is white.

Last but not least, before the 90s, they were caught by hands only, but after that, the trapping method came into existence.

Main Differences Between Crab and Lobster 

  1. When the sizes of both animals are compared, lobster has a smaller body than a crab which can have a body up to even 12 feet, while mostly lobster grows till 5 feet.
  2. They also have different body structures, such as the eyes of a crab are located on their eyestalks while the eyes of a lobster in located on the base of the antennae. Along with this, crabs have a large carapace covering their body and exoskeleton, which is small in size, whereas lobster has a comparatively larger and longer exoskeleton.
  3. Although crabs have a larger body, their claws are much smaller in size than a lobster’s. Despite a small body, their claws are larger when compared. Not only this, but crabs also have short tails and antennae as compared to the lobsters.
  4. Crabs have more species of about 6800 in number while lobster has species of around 85 in number.
  5. Crabs can walk normally forward and backward, but mostly they walk sideways while lobsters always walk forward and backward only.
  6. Crabs are more social than lobsters which usually live in solitary.
  7. Generally, lobsters live a longer life than a normal crab, but there are some exceptions too.
Difference Between Crab and Lobster


Therefore it is very much clear how both lobster and crab are different from each other. Except for the difference, they are similar as both of them belong to the same class Crustacea under the phylum Arthropoda, and are marine invertebrates and look similar in appearance.

Although seafood has many advantages like any other food, it comes with few disadvantages too, which include it is high in mercury, it is sometimes poisonous, uncooked seafood is dangerous, it sometimes bears unknown threats, and some people tend to be allergic to some plates of seafood.


  1. https://www.jstor.org/stable/20104952
  2. https://cdnsciencepub.com/doi/abs/10.1139/f58-073
  3. https://pubmed.ncbi.nlm.nih.gov/25144082/
  4. https://books.google.com/books?hl=en&lr=&id=FBLTDwAAQBAJ&oi=fnd&pg=PA17&dq=what+is+seafood&ots=zVFdlz9i5i&sig=4WSzCzczSo1DBlfCP3tVzTMxhDw
  5. https://www.sciencedirect.com/science/article/pii/S0308814613000575
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