How to detect that fish is not active(fstop feeding, move to surface, swollen belly etc

1. Physical Signs
• Fin Damage – Torn, frayed, clamped, or discolored fins can signal fin rot, infections, or aggression from other fish.
• Swollen Belly (Dropsy or Bloating) – A bloated abdomen may indicate constipation, internal parasites, or organ failure.
• Skin & Scales – Look for white spots (ich), fuzzy patches (fungal infection), ulcers, or missing scales.
• Gills – Red, swollen, or rapidly moving gills can mean infection, parasites, or poor water quality.
• Color Changes – Loss of brightness, unusual darkening, or pale patches are signs of stress or disease.

2. Behavioral Signs
• Stop Feeding – A healthy fish eats eagerly; refusal to eat usually signals stress, poor water conditions, or disease.
• Move to Surface – Constant gasping at the surface suggests oxygen deficiency, gill disease, or ammonia/nitrite poisoning.
• Improper/Abnormal Movement – Erratic swimming, floating sideways, spinning, or sinking can mean swim bladder problems, nervous system issues, or toxins.
• Isolation – A sick fish may separate itself from the group and hide often.
• Rubbing/Flashing – Scraping body against rocks or glass can indicate parasites or skin irritation.

3. Environmental Clues
• Check Tank Conditions – Poor water quality (ammonia, nitrite, nitrate imbalance, low oxygen) often causes illness before visible signs.
• Tankmates’ Health – If several fish show symptoms, the cause may be environmental or infectious.
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