Japanese koi knowledge hubLearn about koi
Learn about koi
in Malaysia.
Research-led guides organised around the eight decisions that shape healthy koi keeping—from pond capacity and water to selection and varieties.
Eight learning paths
Choose where to begin.
Start with the problem in front of you or follow the library from fundamentals to confident selection.
Koi Basics
15 guides- The Complete Beginner's Guide to Keeping Koi
- What Are Koi? Understanding Nishikigoi
- How Long Do Koi Live
- How Big Can Koi Grow
- How Many Koi Can You Keep in a Pond
- How to Choose Your First Koi
- How to Introduce New Koi to Your Pond Safely
- How to Handle Bowl and Move Koi Safely
- Male vs Female Koi: How to Tell the Difference
- Understanding Koi Age Classes Tosai Nisai Sansai and Beyond
- Japanese Koi Terminology Every Koi Keeper Should Know
- The Koi Keeper’s Daily Weekly and Monthly Maintenance Routine
- 20 Common Koi Keeping Mistakes and How to Avoid Them
- How Much Does It Really Cost to Keep Koi
- Japanese Koi vs Other Koi What Does Origin Actually Mean
Koi Health & Diseases
29 guides- Complete Guide to Koi Diseases: Symptoms, Diagnosis and Treatment
- How to Tell If Your Koi Is Sick: Early Warning Signs
- Why Is My Koi Flashing or Rubbing Against the Pond?
- Why Is My Koi Gasping at the Surface?
- Why Has My Koi Stopped Eating
- Why Is My Koi Lethargic or Sitting on the Bottom
- Koi Ulcers Causes Diagnosis Treatment and Prevention
- Fin Rot in Koi: Symptoms, Causes and Treatment
- Dropsy in Koi What the Pinecone Appearance Really Means
- Red Veins and Reddening in Koi
- Excess Mucus on Koi: Causes and What to Check
- Gill Problems in Koi: Symptoms, Causes and Diagnosis
- Costia in Koi: Identification, Symptoms and Treatment
- Trichodina in Koi: Identification, Symptoms and Treatment
- Chilodonella in Koi: Identification, Symptoms and Treatment
- White Spot (Ich) in Koi: Life Cycle, Symptoms and Treatment
- Skin Flukes in Koi: Gyrodactylus Explained
- Gill Flukes in Koi: Identification, Symptoms and Treatment
- Anchor Worm in Koi: Identification and Control
- Fish Lice (Argulus) in Koi: Identification and Treatment
- Leeches on Koi: Identification, Treatment and Prevention
- Koi Herpesvirus (KHV): Symptoms, Testing and Biosecurity
- Carp Edema Virus (CEV/Koi Sleepy Disease): Complete Guide
- Bacterial Infections in Koi: Aeromonas, Pseudomonas and Beyond
- How to Perform a Koi Skin Scrape and Microscopic Examination
- Salt in Koi Keeping: When It Helps, When It Doesn't and Important Risks
- Koi First Aid: What to Do When You Find an Injured or Sick Fish
- Koi Quarantine Protocol: A Step-by-Step 30-Day Quarantine Procedure
- Koi Disease Visual Field Guide
Water Quality & Management
20 guides- Complete Guide to Koi Pond Water Quality
- Ideal Water Parameters for a Koi Pond
- Ammonia in Koi Ponds: Causes, Toxicity and How to Reduce It
- Understanding Nitrite and Nitrite Poisoning in Koi
- Nitrate in Koi Ponds: How Much Is Too Much?
- Understanding the Nitrogen Cycle in a Koi Pond
- Koi Pond pH: What’s Ideal and Why Stability Matters
- KH / Alkalinity Explained: The Key to Stable Pond pH
- GH / General Hardness and Koi: Does It Matter?
- TDS in Koi Ponds: What the Number Does — and Does Not — Tell You
- Dissolved Oxygen in Koi Ponds: Why It Matters
- Chlorine and Chloramine: Protecting Koi During Water Changes
- How Much Water Should You Change in a Koi Pond?
- How to Test Koi Pond Water Correctly
- Green Pond Water: Causes, Solutions and Prevention
- Cloudy Koi Pond Water: How to Find the Cause
- Heavy Rain and Koi Ponds: pH, KH, Overflow and Water-Quality Risks
- Water Temperature and Koi: How Temperature Changes Pond Biology
- New Pond Syndrome: Ammonia, Nitrite and an Immature Biofilter
- Emergency Water-Quality Problems: A Step-by-Step Troubleshooting Guide
Filtration
18 guides- Complete Guide to Koi Pond Filtration
- Mechanical vs Biological Filtration: What’s the Difference?
- How Biological Filtration Works in a Koi Pond
- How to Size a Filter for Your Koi Pond
- K1 Moving-Bed Filters: How They Work
- Bakki Showers: How Shower Filtration Works
- Rotary Drum Filters (RDF): Complete Guide
- Bead Filters for Koi Ponds: Advantages and Limitations
- Sieve Filters: How They Work and Where They Fit
- Settlement Chambers: Are They Still Useful?
- Filter Media Compared: Choosing Biological Media
- Understanding Biofilm and Nitrifying Bacteria
- Troubleshooting Common Koi Pond Filtration Problems
- Filter Maintenance: Cleaning Without Damaging Your Biological Filter
- Why Your Koi Pond Filter Isn’t Keeping the Water Clear
- UV Clarifiers for Koi Ponds: What They Do and Don’t Do
- Combining RDF, Moving Bed and Bakki Shower Filtration
- Designing a High-Performance Filtration System for a Heavily Stocked Koi Pond
Feeding & Nutrition
14 guides- Complete Guide to Feeding Koi
- What Should Koi Eat? Understanding Koi Nutrition
- How Much Should You Feed Your Koi?
- Feeding Frequency and Timing for Koi
- Protein in Koi Food: How Much Do Koi Need?
- Growth Food vs Colour Food vs Maintenance Food
- How Water Temperature Affects Koi Feeding and Digestion
- Feeding Koi for Maximum Healthy Growth
- Feeding Koi for Body Shape and Condition
- Colour-Enhancing Foods for Koi
- WHEAT GERM KOI FOOD
- CAN YOU OVERFEED KOI
- FRESH FOODS FRUIT AND VEGETABLES FOR KOI
- HOW TO CHOOSE A HIGH QUALITY KOI FOOD
Koi Varieties
23 guides- Complete Guide to Koi Varieties
- Kohaku: Complete Variety Guide
- Taisho Sanshoku (Sanke): Complete Variety Guide
- Showa Sanshoku: Complete Variety Guide
- Shiro Utsuri: Complete Variety Guide
- Hi Utsuri and Ki Utsuri: Complete Guide
- Asagi: Complete Variety Guide
- Shusui: Complete Variety Guide
- Koromo: Complete Variety Guide
- Goshiki: Complete Variety Guide
- Kujaku: Complete Variety Guide
- Hariwake: Complete Variety Guide
- Yamabuki Ogon: Complete Variety Guide
- Platinum Ogon: Complete Variety Guide
- Chagoi: Complete Variety Guide
- Soragoi: Complete Variety Guide
- Ochiba Shigure: Complete Variety Guide
- Ginrin Koi: Understanding Ginrin Types and Quality
- Doitsu Koi: Scale Patterns, Types and Appreciation
- Tancho Koi: Complete Guide
- Kin Showa and Gin Showa: Metallic Showa Explained
- Kawarimono: Understanding the Diverse Non-Standard Koi Varieties
- Kohaku vs Sanke vs Showa: What Is the Difference?
Koi Selection & Development
17 guides- How to Assess Koi Quality
- Koi Body Conformation: What Makes a Great Body?
- Understanding Koi Skin Quality
- Understanding Beni: Colour, Quality and Development
- Understanding Sumi: Quality, Placement and Development
- Understanding Shiroji: Why White Skin Matters
- How to Evaluate Koi Pattern and Balance
- How to Select a High-Quality Tosai
- How to Select Koi for Future Growth Potential
- Male vs Female Koi: Differences in Development and Show Potential
- How Koi Patterns and Colours Change as They Grow
- How Genetics, Environment and Husbandry Influence Koi Development
- Jumbo Koi: What Determines Maximum Growth?
- How to Assess Kohaku Quality
- How to Assess Sanke Quality
- How to Assess Showa Quality
- How to Choose the Right Koi Size for Your Pond
Pond & Equipment
17 guides- Complete Guide to Designing a Koi Pond
- How Big Should a Koi Pond Be?
- How Deep Should a Koi Pond Be?
- How to Calculate Your Koi Pond's True Water Volume
- Bottom Drains: Why Koi Ponds Need Them
- Pond Skimmers: What They Do and Where to Position Them
- Koi Pond Pumps: How to Choose the Correct Flow Rate
- Koi Pond Turnover Rate: How Much Flow Do You Really Need?
- Air Pumps and Aeration: How Much Does a Koi Pond Need?
- Return Jets and Pond Circulation: Eliminating Dead Spots
- Pipe Sizing for Koi Ponds: Flow, Friction and Gravity Systems
- Gravity-Fed vs Pump-Fed Koi Pond Filtration
- Concrete Koi Ponds: Design and Construction Considerations
- Waterproofing a Koi Pond: Common Systems and Mistakes
- How to Build and Set Up a Koi Quarantine Tank
- Backup Power for Koi Ponds: Preparing for Power Failures
- How to Design a Koi Pond for Malaysia's Tropical Climate
Put names to the patterns.
Compare 31 koi types using labelled reference photographs and concise identification notes.
Explore Koi Varieties