Fish live in rivers, lakes, and oceans all around the world—but do you know how to describe their body parts in English? From the shiny scales to the flexible fins and the moving gills, each part of a fish has an important role in helping it survive underwater.
In this lesson, you’ll explore essential parts of a fish vocabulary, discover what each part does, and practice pronunciation to improve your English skills.
Parts of A Fish
Fish are aquatic animals that breathe through gills and are covered in scales. They come in a variety of shapes, sizes, and colors, and can be found in almost every body of water on Earth.
- Dorsal fins
- Spiny
- Soft-rayed
- Lateral line
- Scales
- Nostril
- Mouth
- Eye
- Pectoral fin
- Pelvic fin
- Anal fin
- Caudal fin
- Gill
- Teeth
- Caudal peduncle
- Vent
- Operculum
Parts of A Fish Vocabulary
Head /hɛd/
- Mouth /maʊθ/ – Used for eating and breathing. Some fish have small mouths, while others have large ones.
- Teeth /tiːθ/ – Some fish have sharp teeth, while others have none at all.
- Eyes /aɪz/ – Fish have eyes on the sides of their heads, giving them a wide view.
- Nostrils /ˈnɑːstrəlz/ – Small openings that help fish smell underwater.
- Gills /ɡɪlz/ – Special organs that allow fish to breathe by taking oxygen from water.
Body /ˈbɑːdi/
- Scales /skeɪlz/ – Small, thin plates that cover and protect the fish’s body.
- Lateral Line /ˈlætərəl laɪn/ – A line along the side of the body that helps fish sense vibrations and movement in water.
- Dorsal Fin /ˈdɔːrsəl fɪn/ – The fin on top of the fish that helps it stay balanced.
- Pectoral Fins /ˈpɛktərəl fɪnz/ – The pair of fins near the head, used for steering and movement.
- Pelvic Fins /ˈpɛlvɪk fɪnz/ – Found on the underside, helping with balance.
- Anal Fin /ˈeɪnəl fɪn/ – A fin on the lower body near the tail that keeps the fish stable.
- Tail Fin /teɪl fɪn/ (Caudal Fin /ˈkɔːdəl fɪn/) – The main fin at the back, used for swimming forward.
Inside Parts (basic)
- Heart /hɑːrt/ – Pumps blood through the body.
- Swim Bladder /swɪm ˈblædər/ – A special organ that helps fish float or sink in water.
- Stomach /ˈstʌmək/ – Where food is digested.
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Last Updated on January 8, 2026
