A fish on its side, in a cork or in a corkscrew usually has a swim bladder problem, constipation due to overfeeding, infection or bad water. First test and improve the water; then look at diet. It's not a "funny" trick.
Measure, don't guess.If there are fish and NH₃/NO₂⁻ammonia · nitrites · sobrenutrition · diseases.
Aquarium hobby (fish/water only)
Reference:Merck — aquarium fish
Theme: "fish swims sideways." Measure before medicating: ammonia, nitrite, nitrate, temperature and appearance of the fish.
- Biological load consistent with real liters and filtration.
- Regular partial water changes; Do not clean the filter with hot tap water.
- Related:nitrogen cycle.
Alarms
- Panting, stuck fins, die-off, high ammonia/nitrite.
Do not mix advice from walks, snacks or mammal heat.
Based on reference sources. Orientación por species, anclada a fuentes de referencia. No sustituye atención veterinaria.
Practical detail
- Measure ammonia/nitrite/nitrate and temperature before medicating.
- Partial water changes; Do not clean the filter material with hot tap water.
- Sobrepoblación y sobrenutrition son causas frecuentes de crisis.
Frequently asked questions
Can I copy a tip from another species?
No. Do not blindly medicate or use mammalian advice for water.
Home medication
Do not use human drugs or viral tips.
Does this replace a veterinarian?
No.
Sources
- Merck — Aquarium fish www.merckvetmanual.com· consulted 2026-08-07
- OATA — Water quality (trade assoc.) ornamentalfish.org· consulted 2026-08-07
