THE TREE OF FISHES

How to Explore Fish Atlas

Overview

Fish Atlas offers several routes into the same subject. You can follow the classification directory, browse a group such as aquarium fish, or open a species profile from an image. Each route answers a different question. The directory helps you explore relationships. A themed collection helps you compare fish that share a setting or a human use. A species page brings the attention back to one named organism and the information recorded about it.

The most useful first step is to decide what you want to learn. Are you trying to identify a fish you saw, understand a name you encountered, or compare animals from a particular environment? Begin with one question, follow the relevant links, and keep track of the evidence that changes your answer.

Start with the Name, but Keep the Context

A common name is a convenient starting point, especially when it is the only information available. It may come from a shop label, a photograph caption, a book or a conversation. Search for that name, then compare the scientific names of the results. Do not assume that two pages describe the same species simply because their everyday names look similar. The context in which a name was used matters.

For example, a market name and an aquarium trade name serve different purposes from a scientific name. Before carrying a fact from one page to another, check the complete species name. If a source uses an older name, look for an explanation of the relationship between that name and the currently accepted one. A disagreement in wording can be a naming issue rather than a disagreement about the animal.

Choose Between Classification and Theme

The fish directory arranges records by taxonomic groups. Use it when you want to see how a species fits into a larger classification or explore other members of a family. The level of detail increases as you move toward individual species. Take a moment to notice which level you are viewing: a statement about a family should not automatically be treated as a statement about every species in it.

The Types of Fish pages offer a different approach. Categories such as freshwater fish, aquarium fish and Asian fish are useful browsing routes, but they are not equivalent taxonomic ranks. A single species may appear in several collections. That overlap is expected: the collections help answer different questions about environment, geography or human use. They are invitations to compare records, not mutually exclusive boxes into which every fish must fit.

Read an Image as One Part of the Record

A striking picture can make you want to learn more, but it should not settle an identification by itself. First ask what kind of image you are looking at. A photograph documents a particular animal under particular conditions. An illustration can introduce a body form or a scene, while an AI-generated illustration may include details that do not match a real specimen. These uses should remain distinct.

For an identification, compare visible features with a reliable description and consider where the animal was observed. Body outline, mouth position and the arrangement of fins can guide the comparison. If the photograph hides an important feature, record that limitation rather than guessing. The Florida Museum's fish anatomy material offers a starting vocabulary for describing what is visible.

Ask What a Number Actually Measures

Numbers in a species profile look precise, but they still need context. Before using a length, depth or other measurement, check the field label, units and source. A recorded maximum is not a promise about the individual in your photograph or the animal in a shop. If the method or context is missing, treat the value as a lead to investigate, rather than silently supplying the missing explanation.

The same care applies to the atlas itself. Counts shown on this website describe the records included in the atlas and its current browsing structure. They should not be used as a timeless census of every fish known to science. For a claim about worldwide diversity, consult a relevant taxonomic source and include the date of the count.

Follow the Evidence Behind a Statement

When a fact matters to your question, follow its source. Check whether the source discusses the same species and whether it supports the particular statement you are using. A page about an entire family may provide background without establishing a precise fact about one member. A photograph credit establishes an image's provenance; it does not necessarily support the surrounding ecological description.

A useful reading note has three parts: the statement, the source and its limitation. You might write that a distribution record refers to a particular locality, or that a measurement comes from a specified study. If no source is available for the detail you need, keep the question open.

Turn Browsing into a Small Investigation

Choose two species and compare just one question at a time. Start with identity, then move to the relevant habitat, distribution or descriptive information. Write down which differences are supported and which remain uncertain.

For practical next steps, read How to Identify a Fish when you have an observation to investigate, or How to Read a Fish Profile when you want to interpret the fields on a page. If you find a mismatch in the atlas, use Contact & Corrections and include the page address, the exact issue and a supporting reference.

• Fish anatomy reference

• How to compare fish records when sources disagree
• How to identify a fish: shape, fins and morphological evidence
• How to read a fish profile: taxonomy, metrics and sources
• About the atlas and data sources