Difference Between Clam and Cockle

In terms of the habitat of each, clams are usually found closer to the sea shore, while cockles are commonly found scattered on the seabed in significant abundance.


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This seminal difference is further exemplified in the other dissimilarities embodied by these two varieties of mollusks.

Clam vs Cockle

The difference between clam and cockle is that the former variety of mollusk is found in both freshwater and saltwater reservoirs, while the latter category of mollusks occurs solely in the briny water bodies around the world.

The natural habitat of these two varieties of bivalve mollusks is quite contrary to each other.

Clam vs Cockle

Clams can thrive in both types of water bodies. However, cockles can only survive in the salty waters of certain reservoirs. They are not found in freshwater reserves.

Comparison Table

Parameters of ComparisonClamCockle
HabitatClams are bivalve mollusks commonly found in both freshwater as well as saltwater reserves.Cockles are bivalve mollusks that naturally grow in the saltwater, briny reserves around the world.
ShapeThe shell of a clam can be oval, rectangular, or elongated.Cockles have distinctive heart-shaped shells that are covered with slightly ribbed patterns.
Extend of categorizationClam is a broader category of classification.Cockle is a narrower category of classification.
Location in the SeaClam can be found closer to the sea shore.Cockles are commonly found closer to the sea bed.
Raw ConsumptionClams can be consumed in their raw state.It is imprudent to consume raw cockles. They should be cooked thoroughly or steamed to obtain the best results.
SizeClams are larger than cockles.Cockles are much smaller than clams.
ExclusivityAll clams are not cockles.All cockles are clams.

What are Clams?

The variety of shellfish sold in the market is truly boundless. Clams are one of the most well-known and beloved shellfish assortment available at most seafood restaurants globally.

These bivalve mollusks occur naturally in the freshwater reserves around the world.

The term ‘clams’ functions as a broader category of classification as it generally includes within its folds all the other varieties of bivalve mollusks.

Clams are available in different shapes and sizes. Their bodies are protected by a strong exoskeleton in the form of a shell. A clam’s shell comprises of two equal sections that are joined together.

The soft body that remains secured inside the shell does not have a mouth or a head.

However, these mollusks do have an internal renal system, circulatory system, a mouth, and a heart. Clams use siphons to breathe and are commonly found in the sandy or muddy regions of the reservoir.

They can be consumed in their raw state, however, they taste best when baked or boiled.


What are Cockles?

Cockles are generally identified as a distant relative of the clam familial order. They are found in the briny waters around the world. The cockle category of bivalve mollusks is much smaller than clams.

They are generally located closer to the sea bed.

Cockles also have a strong exoskeleton to protect their soft interiors. The distinctive shell shape and appearance of a cockle sets it apart from the rest of the shellfish variants.

The heart-shaped cockle shell features quite distinct ribbed patterns. These patterns can never be replicated by other shellfish variants.

Cockles thrive on the sandy and muddy areas around the briny waters and feed on plankton to grow. These mollusks taste best when cooked thoroughly.

Meticulously washing them is important before beginning the cooking process. This eliminates the excessive sand from their shells.

They can be fried, steamed, or boiled. However, consuming raw cockles can cause severe health ailments.


Main Differences Between Clam and Cockle

  1. The main difference between a clam and a cockle is that the former bivalve mollusks can be found in both freshwater and saltwater environments, while cockles can only be obtained from saltwater bodies. They are briny mollusks that thrive within a saltwater habitat.
  2. The word clam is used as a broad classificatory term, while cockle is used in a much narrower sense.
  3. The overall shape of each mollusk’s shell is also quite different. Cockles usually have an oval or heart-shaped, slightly ribbed shell. Their shells have distinctive patterns that easily differentiate them from clams. Conversely, clams occur in a variety of shapes and sizes. They can be triangular, oval, or elongated.
  4. Cockles are commonly found closer to the bottom of the sea, while clams are usually found closer to the surface. Clams do not live near the sea floor.
  5. Clams are fit to be consumed raw. However, consuming cockles raw is not very advisable. They taste best when steamed and served with a butter and lemon dressing. Consuming cockles raw may lead to serious health issues.
  6. The size of each of these bivalve mollusks also sets them apart from one another. Cockles are much smaller than clams.
  7. All cockles are clams, as they belong to the clam family. However, all clams may not be cockles as there are other clam variants that occur naturally.
Difference Between Clam and Cockle


  1. https://royalsocietypublishing.org/doi/abs/10.1098/rspb.2018.2684
  2. https://academic.oup.com/zoolinnean/article-abstract/136/3/321/2631244
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