Identify the fish
Use a pair or group ID, source, acquisition date, strain, species and known relationship.
Record events
Note conditioning changes, courtship, spawning, birth, hatch, free-swimming date, parental removal and transfers.
Connect water to outcomes
Add temperature, pH, hardness and nitrogen-waste readings around important events.
Track offspring
Record approximate number, first foods, survival, growth, sex separation and destination.
Be honest about uncertainty
Write “unknown” rather than inventing parentage, hatch dates or purity. The browser-based breeding log can export a CSV for your own records.