{"id":1202,"date":"2026-05-05T09:00:00","date_gmt":"2026-05-05T07:00:00","guid":{"rendered":"https:\/\/koitalk.app\/?page_id=1202"},"modified":"2026-05-27T14:17:01","modified_gmt":"2026-05-27T14:17:01","slug":"ammonia-in-koi-ponds","status":"publish","type":"page","link":"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/","title":{"rendered":"Ammonia In Koi Ponds"},"content":{"rendered":"<div class=\"kt-site\" aria-label=\"Ammonia in koi ponds guide\">\n<main><\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Practical_Priority\" >Practical Priority<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Why_Ammonia_in_Koi_Ponds_Matters\" >Why Ammonia in Koi Ponds Matters<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Ammonia_Starts_With_Waste\" >Ammonia Starts With Waste<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#New_Ponds_Are_Vulnerable\" >New Ponds Are Vulnerable<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Context_Changes_Risk\" >Context Changes Risk<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Common_Causes_of_Ammonia_in_Koi_Ponds\" >Common Causes of Ammonia in Koi Ponds<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Possible_Signs_of_Ammonia_Stress\" >Possible Signs of Ammonia Stress<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Breathing_and_Gills\" >Breathing and Gills<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Body_Language\" >Body Language<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Secondary_Health_Problems\" >Secondary Health Problems<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#First_Response_to_Ammonia_in_Koi_Ponds\" >First Response to Ammonia in Koi Ponds<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Testing_Ammonia_Properly\" >Testing Ammonia Properly<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Test_the_Same_Day\" >Test the Same Day<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Record_the_Pattern\" >Record the Pattern<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Watch_Nitrite_Next\" >Watch Nitrite Next<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Useful_Ammonia_Testing_and_Support_Tools\" >Useful Ammonia Testing and Support Tools<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Helpful_Categories\" >Helpful Categories<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Ammonia_and_the_Biological_Filter\" >Ammonia and the Biological Filter<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#What_to_Check\" >What to Check<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#What_Not_to_Do\" >What Not to Do<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Do_Not_Keep_Feeding_Normally\" >Do Not Keep Feeding Normally<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Do_Not_Destroy_Filter_Bacteria\" >Do Not Destroy Filter Bacteria<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Do_Not_Guess_From_Symptoms_Alone\" >Do Not Guess From Symptoms Alone<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#When_to_Ask_for_Help\" >When to Ask for Help<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Q_A_Ammonia_in_Koi_Ponds\" >Q&amp;A: Ammonia in Koi Ponds<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#What_causes_ammonia_in_koi_ponds\" >What causes ammonia in koi ponds?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Why_is_ammonia_dangerous_for_koi\" >Why is ammonia dangerous for koi?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Should_I_stop_feeding_when_ammonia_is_present\" >Should I stop feeding when ammonia is present?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Can_a_new_pond_have_ammonia_even_if_the_water_looks_clean\" >Can a new pond have ammonia even if the water looks clean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#What_should_I_test_together_with_ammonia\" >What should I test together with ammonia?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Is_ammonia_always_a_filter_problem\" >Is ammonia always a filter problem?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Further_Reading\" >Further Reading<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/#Next_Step\" >Next Step<\/a><\/li><\/ul><\/nav><\/div>\n\n<section class=\"kt-hero\">\n<div class=\"kt-wrap kt-hero__inner\">\n<div>\n<p class=\"kt-kicker\">Water quality guide<\/p>\n<h1>Ammonia in Koi Ponds<\/h1>\n<p class=\"kt-lede\">Ammonia in koi ponds is one of the first serious water-quality risks every koi keeper must understand. It can rise in new ponds, overstocked ponds, overfed ponds, poorly filtered ponds, or systems where the biological filter has been disturbed.<\/p>\n<div class=\"kt-actions\">\n        <a class=\"kt-button\" href=\"https:\/\/koitalk.app\/ja\/pond-water-quality\/\">Pond &amp; Water Quality<\/a><br \/>\n        <a class=\"kt-button-secondary\" href=\"https:\/\/koitalk.app\/ja\/koi-health\/\">Koi Health<\/a><br \/>\n        <a class=\"kt-button-secondary\" href=\"https:\/\/koitalk.app\/ja\/recommended-koi-products\/\">Recommended Products<\/a>\n      <\/div>\n<\/p><\/div>\n<aside class=\"kt-signal\">\n<h2><span class=\"ez-toc-section\" id=\"Practical_Priority\"><\/span>Practical Priority<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If koi show stress and ammonia is present, treat the reading seriously. Test pH, temperature, KH, nitrite, oxygen, feeding, stocking, and filtration before taking action.<\/p>\n<\/aside><\/div>\n<\/section>\n<section class=\"kt-band\">\n<div class=\"kt-wrap\">\n<div class=\"kt-section-head\">\n<h2><span class=\"ez-toc-section\" id=\"Why_Ammonia_in_Koi_Ponds_Matters\"><\/span>Why Ammonia in Koi Ponds Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ammonia in koi ponds comes from fish waste, gill activity, uneaten food, decaying leaves, dead algae, sludge, and immature filtration. A mature biological filter converts ammonia as part of the pond nitrogen cycle.<\/p>\n<\/p><\/div>\n<div class=\"kt-grid\">\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Ammonia_Starts_With_Waste\"><\/span>Ammonia Starts With Waste<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Every koi pond produces waste. The issue is whether the pond can process ammonia safely through biological filtration, oxygen, stable KH, sensible feeding, and a fish load that matches the system.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"New_Ponds_Are_Vulnerable\"><\/span>New Ponds Are Vulnerable<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A new pond or new filter may not yet have enough nitrifying bacteria. This is often called new pond syndrome, and ammonia in koi ponds often appears before the filter is fully mature.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Context_Changes_Risk\"><\/span>Context Changes Risk<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ammonia readings should be interpreted together with pH and temperature. The same ammonia result can become more dangerous in warmer water and at higher pH.<\/p>\n<\/article><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band kt-band--soft\">\n<div class=\"kt-wrap kt-two\">\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Common_Causes_of_Ammonia_in_Koi_Ponds\"><\/span>Common Causes of Ammonia in Koi Ponds<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Most ammonia problems have a practical cause. Before adding treatments, look at the pond as a whole system: fish load, feeding, filtration, oxygen, filter maturity, and recent changes.<\/p>\n<\/p><\/div>\n<ul class=\"kt-list\">\n<li>Too many koi for the pond volume or filter capacity.<\/li>\n<li>Overfeeding, especially in cool water or unstable weather.<\/li>\n<li>A new pond or filter that has not matured yet.<\/li>\n<li>Cleaning filter media too aggressively and removing useful bacteria.<\/li>\n<li>Dead leaves, plant material, sludge, dead algae, or uneaten food.<\/li>\n<li>A recent medication or chemical treatment that affected filter bacteria.<\/li>\n<li>Low oxygen, which reduces filter performance and increases fish stress.<\/li>\n<\/ul><\/div>\n<\/section>\n<section class=\"kt-band\">\n<div class=\"kt-wrap\">\n<div class=\"kt-section-head\">\n<h2><span class=\"ez-toc-section\" id=\"Possible_Signs_of_Ammonia_Stress\"><\/span>Possible Signs of Ammonia Stress<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Koi behavior is an early warning system, but behavior alone is not enough. Always test the water before deciding that ammonia in koi ponds is the only problem.<\/p>\n<\/p><\/div>\n<div class=\"kt-grid\">\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Breathing_and_Gills\"><\/span>Breathing and Gills<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Koi may gasp, breathe heavily, gather near water returns, or spend more time near the surface if ammonia, oxygen, pH, or nitrite is causing stress.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Body_Language\"><\/span>Body Language<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Clamped fins, lethargy, flashing, jumping, isolation, or reduced appetite can all justify immediate water testing.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Secondary_Health_Problems\"><\/span>Secondary Health Problems<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ammonia stress can weaken koi and make other problems worse. Skin irritation, gill stress, parasites, ulcers, or bacterial issues may appear alongside poor water quality.<\/p>\n<\/article><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band kt-band--soft\">\n<div class=\"kt-wrap kt-two\">\n<div>\n<h2><span class=\"ez-toc-section\" id=\"First_Response_to_Ammonia_in_Koi_Ponds\"><\/span>First Response to Ammonia in Koi Ponds<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do not make sudden, poorly understood changes. The first goal is to reduce risk while protecting oxygen and biological filtration.<\/p>\n<\/p><\/div>\n<ul class=\"kt-list\">\n<li>Stop or reduce feeding while the pond is unstable.<\/li>\n<li>Increase aeration, especially if koi are breathing heavily.<\/li>\n<li>Retest ammonia, pH, KH, nitrite, nitrate, and temperature.<\/li>\n<li>Check whether pumps, air pumps, bottom drains, skimmers, and filters are working correctly.<\/li>\n<li>Remove uneaten food, dead leaves, sludge, or decaying organic material where possible.<\/li>\n<li>Review recent filter cleaning, new fish, treatments, power cuts, or stocking changes.<\/li>\n<li>Avoid adding multiple products at once unless you understand their effect on the pond.<\/li>\n<\/ul><\/div>\n<\/section>\n<section class=\"kt-band\">\n<div class=\"kt-wrap\">\n<div class=\"kt-section-head\">\n<h2><span class=\"ez-toc-section\" id=\"Testing_Ammonia_Properly\"><\/span>Testing Ammonia Properly<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ammonia should never be judged from one number alone. A useful test routine connects ammonia in koi ponds to pH, KH, temperature, oxygen, nitrite, nitrate, and filtration.<\/p>\n<\/p><\/div>\n<div class=\"kt-grid\">\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Test_the_Same_Day\"><\/span>Test the Same Day<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If koi look stressed, test immediately. Do not rely on old readings. Pond conditions can change quickly after feeding, storms, filter problems, power cuts, or warm weather.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Record_the_Pattern\"><\/span>Record the Pattern<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Write down the ammonia result, time, temperature, pH, feeding level, and fish behavior. A pattern over several days is more useful than one isolated result.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Watch_Nitrite_Next\"><\/span>Watch Nitrite Next<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When a filter begins processing ammonia, nitrite may rise next. That is why ammonia in koi ponds and nitrite problems should be understood together.<\/p>\n<\/article><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band kt-band--soft\">\n<div class=\"kt-wrap kt-two\">\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Useful_Ammonia_Testing_and_Support_Tools\"><\/span>Useful Ammonia Testing and Support Tools<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ammonia problems should be handled with testing, oxygen, filtration awareness, and careful feeding decisions. Product choices should support evidence and stability, not replace understanding.<\/p>\n<p>Before using any product, read the label carefully, understand the dose, and avoid mixing several pond products without knowing how they interact.<\/p>\n<\/p><\/div>\n<aside class=\"kt-signal\">\n<h3><span class=\"ez-toc-section\" id=\"Helpful_Categories\"><\/span>Helpful Categories<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul class=\"kt-list\">\n<li>Ammonia test kits<\/li>\n<li>pH and KH test kits<\/li>\n<li>Nitrite test kits<\/li>\n<li>Air pumps and air stones<\/li>\n<li>Dechlorinator<\/li>\n<li>Water log or notebook<\/li>\n<\/ul>\n<p>      <a class=\"kt-button\" href=\"https:\/\/koitalk.app\/ja\/recommended-koi-products\/\">View Recommended Products<\/a><br \/>\n    <\/aside>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band kt-band--soft\">\n<div class=\"kt-wrap kt-two\">\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Ammonia_and_the_Biological_Filter\"><\/span>Ammonia and the Biological Filter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The long-term solution is usually not a single emergency product. Stable water depends on enough biological filtration, oxygen, sensible feeding, and a fish load that matches the pond.<\/p>\n<\/p><\/div>\n<div class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"What_to_Check\"><\/span>What to Check<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul class=\"kt-list\">\n<li>Is the filter large enough for the number and size of koi?<\/li>\n<li>Is water flowing through the biological media correctly?<\/li>\n<li>Was the filter recently cleaned with chlorinated tap water?<\/li>\n<li>Is there enough oxygen for both koi and filter bacteria?<\/li>\n<li>Has feeding increased faster than the filter can handle?<\/li>\n<\/ul><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band\">\n<div class=\"kt-wrap\">\n<div class=\"kt-section-head\">\n<h2><span class=\"ez-toc-section\" id=\"What_Not_to_Do\"><\/span>What Not to Do<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Many ammonia problems become worse because the pond keeper reacts too quickly without understanding the cause.<\/p>\n<\/p><\/div>\n<div class=\"kt-grid\">\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Do_Not_Keep_Feeding_Normally\"><\/span>Do Not Keep Feeding Normally<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Food creates more waste. If ammonia in koi ponds is present, feeding should usually be reduced or paused while you test the pond and correct the cause.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Do_Not_Destroy_Filter_Bacteria\"><\/span>Do Not Destroy Filter Bacteria<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Aggressive filter cleaning can remove the bacteria needed to process ammonia. Clean mechanical waste carefully, but protect biological media.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Do_Not_Guess_From_Symptoms_Alone\"><\/span>Do Not Guess From Symptoms Alone<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gasping, flashing, and lethargy can have several causes. Test water first, then decide whether parasites, oxygen, pH, nitrite, or other issues may also be involved.<\/p>\n<\/article><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band kt-band--soft\">\n<div class=\"kt-wrap\">\n<div class=\"kt-section-head\">\n<h2><span class=\"ez-toc-section\" id=\"When_to_Ask_for_Help\"><\/span>When to Ask for Help<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If koi are gasping, collapsing, lying on the bottom, showing severe gill stress, developing sores, or if ammonia remains present despite corrective action, ask an experienced koi professional or qualified aquatic veterinarian for help. Serious koi health problems should not be handled by guesswork.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band\">\n<div class=\"kt-wrap\">\n<div class=\"kt-section-head\">\n<h2><span class=\"ez-toc-section\" id=\"Q_A_Ammonia_in_Koi_Ponds\"><\/span>Q&amp;A: Ammonia in Koi Ponds<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/p><\/div>\n<div class=\"kt-grid\">\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"What_causes_ammonia_in_koi_ponds\"><\/span>What causes ammonia in koi ponds?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ammonia in koi ponds usually comes from koi waste, uneaten food, decaying organic material, overstocking, immature filters, or damaged biological filtration.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Why_is_ammonia_dangerous_for_koi\"><\/span>Why is ammonia dangerous for koi?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ammonia can irritate and damage the gills, increase stress, reduce appetite, and weaken koi. Risk depends strongly on pH, temperature, oxygen, and exposure time.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Should_I_stop_feeding_when_ammonia_is_present\"><\/span>Should I stop feeding when ammonia is present?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In most cases, yes. Reducing or pausing feeding helps lower waste production while you test the pond and correct the cause.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Can_a_new_pond_have_ammonia_even_if_the_water_looks_clean\"><\/span>Can a new pond have ammonia even if the water looks clean?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. Clear water does not mean safe water. New ponds can have ammonia because the biological filter is not yet mature.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"What_should_I_test_together_with_ammonia\"><\/span>What should I test together with ammonia?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Test pH, KH, nitrite, nitrate, and temperature. Oxygen and filtration should also be checked when koi show stress.<\/p>\n<\/article>\n<article class=\"kt-card\">\n<h3><span class=\"ez-toc-section\" id=\"Is_ammonia_always_a_filter_problem\"><\/span>Is ammonia always a filter problem?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Not always. Ammonia in koi ponds can also be caused by feeding, stocking, dead organic matter, medication, power cuts, or sudden seasonal changes.<\/p>\n<\/article><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"kt-band kt-band--soft\">\n<div class=\"kt-wrap kt-two\">\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Further_Reading\"><\/span>Further Reading<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use these pages to understand the wider water-quality picture before treating symptoms in isolation.<\/p>\n<\/p><\/div>\n<ul class=\"kt-list\">\n<li><a href=\"https:\/\/koitalk.app\/ja\/pond-water-quality\/koi-pond-water-quality-guide\/\">Koi Pond Water Quality Guide<\/a><\/li>\n<li><a href=\"https:\/\/koitalk.app\/ja\/pond-water-quality\/nitrite-in-koi-ponds\/\">Nitrite in Koi Ponds<\/a><\/li>\n<li><a href=\"https:\/\/koitalk.app\/ja\/pond-water-quality\/koi-pond-filter-basics\/\">Koi Pond Filter Basics<\/a><\/li>\n<li><a href=\"https:\/\/koitalk.app\/ja\/recommended-koi-products\/\">Recommended Koi Products<\/a><\/li>\n<li><a href=\"https:\/\/koitalk.app\/ja\/koi-health\/\">Koi Health<\/a><\/li>\n<li><a href=\"https:\/\/koitalk.app\/ja\/koi-health\/koi-parasites-guide\/\">Koi Parasites Guide<\/a><\/li>\n<li><a href=\"https:\/\/koitalk.app\/ja\/koi-health\/koi-ulcers-guide\/\">Koi Ulcers Guide<\/a><\/li>\n<li><a href=\"https:\/\/mantifang.com\/koi-dictionary\/\" target=\"_blank\" rel=\"noopener\">Mantifang Koi Dictionary<\/a><\/li>\n<li><a href=\"https:\/\/mantifang.com\/category\/koi\/\" target=\"_blank\" rel=\"noopener\">Mantifang Koi Archive<\/a><\/li>\n<\/ul><\/div>\n<\/section>\n<section class=\"kt-band\">\n<div class=\"kt-wrap kt-path\">\n<h2><span class=\"ez-toc-section\" id=\"Next_Step\"><\/span>Next Step<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do not look at ammonia alone. Test the full pond picture, reduce stress, protect oxygen, and check whether your filter can safely process the waste your koi produce.<\/p>\n<div class=\"kt-actions\">\n      <a class=\"kt-button\" href=\"https:\/\/koitalk.app\/ja\/pond-water-quality\/nitrite-in-koi-ponds\/\">Read Nitrite in Koi Ponds<\/a><br \/>\n      <a class=\"kt-button-secondary\" href=\"https:\/\/koitalk.app\/ja\/pond-water-quality\/koi-pond-filter-basics\/\">Check Filter Basics<\/a><br \/>\n      <a class=\"kt-button-secondary\" href=\"https:\/\/koitalk.app\/ja\/recommended-koi-products\/\">Recommended Products<\/a>\n    <\/div>\n<\/p><\/div>\n<\/section>\n<p><\/main>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Water quality guide Ammonia in Koi Ponds Ammonia in koi ponds is one of the first serious water-quality risks every koi keeper must understand. It can rise in new ponds, overstocked ponds, overfed ponds, poorly filtered ponds, or systems where the biological filter has been disturbed. Pond &amp; Water Quality Koi Health Recommended Products Practical Priority If koi show stress and ammonia is present, treat the reading seriously. Test pH, temperature, KH, nitrite, oxygen, feeding, stocking, and filtration before taking action. Why Ammonia in Koi Ponds Matters Ammonia in koi ponds comes from fish waste, gill activity, uneaten food, decaying leaves, dead algae, sludge, and immature filtration. A mature biological &#8230; <a title=\"Ammonia In Koi Ponds\" class=\"read-more\" href=\"https:\/\/koitalk.app\/ja\/ammonia-in-koi-ponds\/\" aria-label=\"Ammonia In Koi Ponds \u306b\u3064\u3044\u3066\u3055\u3089\u306b\u8aad\u3080\">\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>","protected":false},"author":1,"featured_media":1509,"parent":0,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1202","page","type-page","status-publish","has-post-thumbnail"],"_links":{"self":[{"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/pages\/1202","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/comments?post=1202"}],"version-history":[{"count":5,"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/pages\/1202\/revisions"}],"predecessor-version":[{"id":1590,"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/pages\/1202\/revisions\/1590"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/media\/1509"}],"wp:attachment":[{"href":"https:\/\/koitalk.app\/ja\/wp-json\/wp\/v2\/media?parent=1202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}