Glossary

Terms

Field mark

A visible feature that reliably separates one species from a similar one.

Lateral line

A line of sensory pores running along each side of a fish, from the gill cover toward the tail.

Dorsal fin

The fin, or pair of fins, along the top of a fish’s back.

Vermiculation

Worm-like, wavy light markings on a darker background.

Barbel

A whisker-like sensory organ near the mouth.

Hybrid

Offspring of two different species.

On-device model

A machine-learning model stored and run on the phone itself.

Sources for this entry

1. CatchVault species profiles: Company-published pages for the species the app recognizes.

Practical guidance is original editorial writing. App details come from the developer’s published descriptions, checked 9 November 2026.

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How the related websites connect

This reference is published alongside CatchVault. Species profiles live on the CatchVault website, and sister references cover fishing apps in general and fishing regulations.

Cite this entry

Best Fish Identifier App. “Glossary.” Content reviewed 9 November 2026.