{"topic_id":"exotic_aquarium_fish_husbandry","category":"exotic-pet-health","context":"---\ntopic_id: exotic_aquarium_fish_husbandry\ncategory: exotic-pet-health\ntitle: \"Aquarium-fish husbandry — nitrogen cycle & biofilter make water quality the central health axis\"\nlang: en\nsource: \"Merck Veterinary Manual — Aquarium-fish husbandry — nitrogen cycle & biofilter make water quality the central health axis\"\nsource_file: pdf-raw/exotic-health/mvm_fish_management.txt\ndate_parsed: 2026-07-28\ntokens_estimated: 220\nverified: true\nverification: c1_substring\nsource_document: \"Merck Veterinary Manual (professional veterinary reference)\"\ncitation:\n  authority: \"Merck Veterinary Manual\"\n  title: \"Aquarium-fish husbandry — nitrogen cycle & biofilter make water quality the central health axis\"\n  url: \"https://www.merckvetmanual.com/exotic-and-laboratory-animals/aquarium-fish/management-of-aquarium-fish\"\n  retrieved: \"2026-07-28\"\n  ref: \"\"\n  doc_type: \"professional veterinary reference\"\n  needs_review: false\n---\n# Aquarium-fish husbandry\n\nThe text below is reproduced verbatim from the first-hand source (Merck Veterinary Manual).\n\n> nitrifying bacteria in the biofilter\n> a transient increase in ammonia and nitrite should be expected\n> Monitoring of ammonia and nitrite until measurable concentrations subside is recommended.\n\nSource: `pdf-raw/exotic-health/mvm_fish_management.txt` (first-hand professional veterinary reference, tag-stripped).\n\n## Claims (verified C1 substrings of source_file)\n- `nitrifying bacteria in the biofilter`\n- `a transient increase in ammonia and nitrite should be expected`\n- `Monitoring of ammonia and nitrite until measurable concentrations subside is recommended.`\n","sources":["exotic-pet-health — Aquarium-fish husbandry — nitrogen cycle & biofilter make water quality the central health axis (retrieved 2026-07-28)"],"source":{"authority":"exotic-pet-health","title":"Aquarium-fish husbandry — nitrogen cycle & biofilter make water quality the central health axis","url":"https://www.merckvetmanual.com/exotic-and-laboratory-animals/aquarium-fish/management-of-aquarium-fish","retrieved":"2026-07-28","ref":"","doc_type":"official PDF","source_document":"Merck Veterinary Manual (professional veterinary reference)","verification_file":"pdf-raw/exotic-health/mvm_fish_management.txt"},"source_document":"Merck Veterinary Manual (professional veterinary reference)","source_file":"pdf-raw/exotic-health/mvm_fish_management.txt","tokens_estimated":220,"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."}