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Shellfish are a fascinating topic for anyone interested in learning English vocabulary related to sea creatures. They come in many shapes and sizes, from clams and mussels to shrimp and crabs. Understanding the different types of shellfish and their uses can expand your vocabulary and enhance your language skills.
List of Shellfish
Related Links: Sea Animals Vocabulary | Mollusks | Crustaceans | Animal Names
Shellfish come in a wide variety of forms, ranging from familiar seafood species to biologically unique marine animals. Some have strong pincers capable of breaking shells, while others possess highly specialized eyes that can detect wavelengths of light beyond the human visible spectrum.
Some shellfish are considered delicacies around the world, while others are known for their remarkable biological adaptations. Below is a list of common shellfish that frequently appear in English vocabulary learning materials.
Shellfish Vocabulary Table
| Vocabulary | IPA (US) | Short Description |
|---|---|---|
| Brown Crab | /braʊn kræb/ | A large edible crab species commonly found in the North Atlantic Ocean. |
| American Lobster | /əˈmerɪkən ˈlɑːbstər/ | A large marine crustacean known for its powerful claws; can grow over 20 kg in rare cases. |
| Mantis Shrimp | /ˈmæntɪs ʃrɪmp/ | A marine crustacean (order Stomatopoda), not a true shrimp, famous for its powerful strike. |
| Butter Clam | /ˈbʌtər klæm/ | A large edible clam species found along the Pacific coast of North America. |
| Sea Urchin | /siː ˈɜːrtʃɪn/ | A spiny marine animal (phylum Echinodermata), not a true shellfish biologically. |
| Whelk | /welk/ | A large sea snail belonging to the class Gastropoda. |
| Scallop | /ˈskæləp/ | A marine bivalve mollusk known for its fan-shaped shell. |
| Oyster | /ˈɔɪstər/ | A saltwater bivalve mollusk often eaten raw or cooked. |
| Mussel | /ˈmʌsəl/ | A bivalve mollusk with a dark shell commonly found attached to rocks. |
| Abalone | /ˌæbəˈloʊni/ | A marine gastropod mollusk known for its colorful inner shell. |
| Crawfish | /ˈkrɔːfɪʃ/ | A freshwater crustacean also called crayfish or crawdad. |
| Cockle | /ˈkɑːkəl/ | A small edible bivalve mollusk with a rounded shell. |
| Prawn | /prɔːn/ | A crustacean similar to shrimp; term usage varies by region (UK vs US). |
| Shrimp | /ʃrɪmp/ | A common marine crustacean; in American English, used broadly for both shrimp and prawns. |
| Crab | /kræb/ | A crustacean with a broad shell and pincers. |
| Lobster | /ˈlɑːbstər/ | A large marine crustacean with a hard exoskeleton and claws. |
What Are Shellfish?
Shellfish is a broad, non-scientific term used to describe various aquatic animals that have protective outer shells. These animals live in both marine and freshwater environments.
From a biological perspective, most organisms commonly called shellfish belong to two main groups:
- Molluscan shellfish – clams, oysters, mussels, scallops, abalone, whelks.
- Crustacean shellfish – crabs, lobsters, shrimp, prawns, crawfish.
Unlike crustaceans, mollusks typically have shells composed mainly of calcium carbonate (CaCO₃). In contrast, crustaceans have an exoskeleton made of chitin.
Important note: Some animals like sea urchins are often grouped with shellfish in culinary contexts, but they belong to a completely different phylum (Echinodermata).
Shellfish List with Facts and Pictures
The Brown Crab (Cancer pagurus)
The brown crab, also known as the edible crab, is commonly found in the North Atlantic Ocean, the North Sea, and parts of the Mediterranean.
It is widely harvested and has high commercial value in Europe, with more than 60,000 metric tonnes caught annually.
The American Lobster (Homarus americanus)
The American lobster is native to the cold waters of the northwestern Atlantic Ocean.
While many adults weigh around 4–9 pounds (2–4 kg), exceptionally large individuals can exceed 20 kg (44 pounds).
Today, it is considered a luxury seafood item, although historically it was once extremely abundant.
The Mantis Shrimp (Order: Stomatopoda)
Mantis shrimp are not true shrimp. They belong to a different order (Stomatopoda), while true shrimp belong to Decapoda.
They are famous for their extremely fast strikes, reaching speeds of about 23 m/s, creating cavitation shockwaves.
- Smashers – break shells.
- Spearers – impale prey.
They also have one of the most advanced visual systems, capable of detecting ultraviolet and polarized light.
The Butter Clam (Saxidomus gigantea)
The butter clam is found along the Pacific coast from the Bering Strait to California.
It feeds by filtering microorganisms from seawater. Under certain conditions, it can accumulate toxins such as saxitoxin, associated with harmful algal blooms (red tides).
Consumption of contaminated shellfish may cause paralytic shellfish poisoning (PSP), so harvesting is carefully monitored.
Shellfish Visual Vocabulary Practice (B1-B2)
Question 1: What animal is shown in this image?
Question 2: Listen to the word and choose the correct animal.
Question 3: Which image shows "Oyster"?
Question 4: Is this animal called "Mussel"?
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