{"topic_id":"exotic_tox_fish_newtank","category":"exotic-pet-toxicology","context":"---\ntopic_id: exotic_tox_fish_newtank\ncategory: exotic-pet-toxicology\ntitle: \"New-tank syndrome — ammonia / nitrite toxicity in ornamental aquarium fish\"\nlang: en\nsource: \"First-hand veterinary toxicology reference, saved to source_file; paraphrased derived fact summary per COPYRIGHT_POLICY §3. Deepened 2026-08-01.\"\nsource_file: pdf-raw/exotic-toxicology/fish.txt\ndate_parsed: 2026-08-01\ntokens_estimated: 353\nverification:\n  method: paraphrase\n  claims: 10\n  passed: 10\n  date: 2026-08-01\nrecovered: false\npath: exotic-pet-toxicology/exotic_tox_fish_newtank/01_exotic_tox_fish_newtank.md\nsource_document: \"Merck Veterinary Manual / first-hand veterinary reference\"\ncitation:\n  authority: \"Merck Veterinary Manual / first-hand veterinary reference\"\n  title: \"New-tank syndrome — ammonia / nitrite toxicity in ornamental aquarium fish\"\n  url: \"https://www.merckvetmanual.com/\"\n  retrieved: \"2026-08-01\"\n  ref: \"\"\n  doc_type: \"professional veterinary reference\"\n  needs_review: false\nlicense: paraphrase\ncopyright_note: \"Source Merck Veterinary Manual (merckvetmanual.com) is a copyrighted veterinary reference and not openly licensed; per COPYRIGHT_POLICY §3 all claims are paraphrased derived fact summaries (numbers and proper nouns preserved, sentences rewritten), not verbatim quotations.\"\nauthority_tier: T3\nauthority_tier_basis: \"T3:vet-ref\"\nauthority_tier_date: 2026-08-04\n---\n\n# New-tank syndrome — ammonia / nitrite toxicity in ornamental aquarium fish\nSource: Merck Veterinary Manual (merckvetmanual.com), a copyrighted veterinary reference. Per COPYRIGHT_POLICY §3, the points below are paraphrased derived fact summaries: numerical values and proper nouns are preserved from the source, but sentences are rewritten and not quoted verbatim.\n\n## Claims\n\n- *[Paraphrased derived summary — non-Open-Access source.]* Antimicrobial therapy is recommended if fish are dying.\n- *[Paraphrased derived summary — non-Open-Access source.]* When antimicrobials are warranted, base drug selection on sensitivity testing where possible.\n- *[Paraphrased derived summary — non-Open-Access source.]* Freshwater fish tissues are hyperosmotic to the water, whereas saltwater fish are hypoosmotic.\n- *[Paraphrased derived summary — non-Open-Access source.]* Key case details: number and species affected, duration, system volume and design, stock numbers and sizes, new arrivals, quarantine, and prior medications.\n- *[Paraphrased derived summary — non-Open-Access source.]* Prophylactic medication without diagnostic testing is strongly discouraged; it can drive resistant infections and other complications.\n- *[Paraphrased derived summary — non-Open-Access source.]* Toxicity often arises when total ammonia nitrogen or nitrite (or both) reach high enough levels.\n- *[Paraphrased derived summary — non-Open-Access source.]* Treatment includes reduced feeding, water changes, added chloride for nitrite toxicity, and checking that biofiltration is adequate.\n- *[Paraphrased derived summary — non-Open-Access source.]* Fishless cycling sets up the tank empty and adds ammonia to at least 1–5 mg/L.\n- *[Paraphrased derived summary — non-Open-Access source.]* Monitor the cycling process by regularly testing ammonia, nitrite, and nitrate.\n- *[Paraphrased derived summary — non-Open-Access source.]* Add fish only once ammonia and nitrite are no longer detectable.\n---\n## License & attribution\n\nSource: Merck Veterinary Manual (merckvetmanual.com) is a copyrighted veterinary reference and is not openly licensed. Per COPYRIGHT_POLICY §3, every claim above is a paraphrased derived fact summary (numbers and proper nouns preserved, sentences rewritten), not a verbatim quotation.\n\n- https://www.merckvetmanual.com/","sources":["exotic-pet-toxicology — New-tank syndrome — ammonia / nitrite toxicity in ornamental aquarium fish (retrieved 2026-08-01)"],"source":{"authority":"exotic-pet-toxicology","title":"New-tank syndrome — ammonia / nitrite toxicity in ornamental aquarium fish","url":"https://www.merckvetmanual.com/","retrieved":"2026-08-01","ref":"","doc_type":"official PDF","source_document":"Merck Veterinary Manual / first-hand veterinary reference","verification_file":"pdf-raw/exotic-toxicology/fish.txt"},"source_document":"Merck Veterinary Manual / first-hand veterinary reference","source_file":"pdf-raw/exotic-toxicology/fish.txt","trust":{"authority_tier":"T3","fidelity":"paraphrase","license":"paraphrase","display_grade":"B"},"tokens_estimated":581,"generated_at":null,"tip":"Use /api/v1/topics to discover more topics. /api/v1/nutrient for precise single-point queries. /api/v1/cross_compare for 2-3 standard comparisons."}