05 / FIELD NOTES & NATURAL HISTORY
Look closely. Disturb less.
A bubble nest is a temporary structure at the water surface. Male Betta splendens build mucus-coated bubbles as part of reproductive and parental behaviour. This journal preserves observations without encouraging breeding or measuring “happiness”.
A nest is not a diagnosis.
Nest building differs among individuals. Presence, absence or size alone cannot establish health, stress or welfare. Keep ordinary care routines; never delay necessary maintenance to preserve a nest.
Keep the viewpoint.
Photograph from the same safe position with similar framing and light. Avoid tapping, flash and moving the fish for a better image. Note reflections, water movement and anything you could not see.
Why is my betta making bubbles?
Nest construction is associated with reproduction and care of offspring. It does not prove that spawning has occurred, nor does it provide a general wellbeing score. Observe the fish and its surroundings without trying to increase nest production.
Why does a bubble nest disappear?
Surface movement and changes in a fragile cluster can alter its shape. Record the last date seen and the next date when it was not seen. The exact disappearance time between those observations is unknown. Do not automatically count every intervening day as confirmed persistence.
Can I measure nest growth from photos?
The outline tool reports polygon area as a fraction of the displayed image. It is not bubble counting or a calibrated physical measurement. Reflections, perspective, zoom and manual tracing cause error. Compare relative area only with consistent framing and a fixed reference.
How should I interpret a water-change pattern?
A few observations may suggest a personal pattern but cannot identify a cause. Do not change temperature, flow or care routines simply to produce a nest. Record missing observations honestly.
Where are my photos stored?
Photos are resized inside your browser and stored with records in IndexedDB on this site’s origin. This journal does not upload them to an archive server. Browsers, devices and domains have separate storage. Download a JSON backup containing compressed photos and restore it on another device. Backups may contain personal photos and notes; keep them private. Hosting, Google and existing advertising services may process normal web usage data.
About this project & methodology
The Floating Archive is an independent hobby observation tool published by the blog operator, 석아산. It is not a veterinary service. All demo images are clearly labelled illustrations, not scientific photographs. Manual outlines, optional coordinates and dates are supplied by the observer. No automatic species, health or causal analysis is performed. Editorial review: October 29, 2026. Feedback: use the Blogger profile linked below.
Read the research
Background sources explain biology; they do not validate this journal’s measurements.
- The pharyngeal organ … supplies mucus for building bubble nests (2010)
- Variation in nest building, aggression, learning, and steroid hormone levels in Betta splendens (2022)
Keep a copy of your collection.
Backups include all compressed photos and observations. Import merges by record ID; conflicting records are preserved under new IDs. Export before clearing site data.