Finding an unfamiliar organism by the shore creates a strong urge to name it immediately. A careful observation can remain useful even when the name is unknown. Begin with visible features and context, staying on permitted routes and leaving the organism undisturbed.
Describe what you can actually see
Note its approximate size, colour, shape, and position relative to the water or substrate. Avoid touching, moving, or collecting it to obtain a clearer view. If the observation is distant or partly obscured, include that limitation.
A photograph can help later discussion, but record the place and time separately so the context is not lost if the image is copied. Do not approach hazardous edges or disturb wildlife for a close-up.
Keep identification provisional
When consulting a guide or asking an experienced observer, share the contextual details as well as the image. Similar-looking organisms may require features that your photograph does not show. “Unidentified” is an acceptable outcome.
If someone suggests a name, record who supplied it and whether it was tentative. The purpose of the notebook is to preserve an observation that can be reconsidered. A confident label added too early can hide uncertainty and make a later correction harder than it needs to be.