Customer Documentation for Koi Sales: Best Practices

By KoiQuanta Editorial Team|Updated Mar 2026

Dealers providing documentation-documentation-for-sales) report lower post-sale customer service demands. That's the bottom line -- the time you invest in clear, complete documentation at the point of sale dramatically reduces the time you spend on follow-up calls from confused or concerned customers.

More importantly, documentation protects you legally and professionally. If a customer calls to say a fish "arrived sick," your documentation shows what health testing was performed, what treatments were administered, and what condition the fish was in at sale. Without documentation, you're in a he-said-she-said dispute. With documentation, you have facts.

KoiQuanta generates care sheets and koi quarantine program records formatted for customer delivery directly from your fish records, so the documentation you give customers reflects your actual logged data.

TL;DR

State explicitly that you recommend quarantine for 30 days before introducing new fish to an established pond, explain why (disease prevention and parasite detection), and give basic setup requirements.
Tracking trends over time reveals issues before they become visible in fish behavior.
KoiQuanta connects observations, water data, and treatment records in one searchable history.
Early detection based on parameter trends reduces treatment costs and fish stress.
Seasonal changes require adjusted monitoring schedules; automated reminders help maintain consistency.

The Core Documentation Package

Every customer who buys koi from a professional dealer should receive three things:

A quarantine/health certificate
A care sheet
A purchase record

These can be separate documents or combined into a single package, but all three serve different purposes and all three matter.

Quarantine and Health Certificate

This documents what happened to the fish before it reached the customer. It should show arrival date at your facility, quarantine duration, health testing performed (especially KHV testing), treatments administered, and a statement of the fish's health status at sale.

For more detail on what this certificate should contain, the koi dealer quarantine certificate guide covers the complete required components. For the compliance side of health documentation, see the koi dealer operations guide.

The key principle: the certificate should be specific enough that it answers the customer's actual questions before they ask them. If a customer later encounters disease, the first thing they'll want to know is whether the fish was tested for KHV. If your certificate doesn't mention KHV testing, that uncertainty creates anxiety and disputes.

Care Sheets: What to Include

A care sheet is a practical reference document that helps the customer keep their new fish alive and healthy. It serves a different purpose than the health certificate -- where the certificate documents the fish's history, the care sheet guides the customer's future behavior.

For the care sheet to be useful, it needs to match the actual fish being purchased. A care sheet for a jumbo Showa going to an experienced koi keeper should contain different information than a care sheet for two tosai Kohaku going to a first-time pond owner.

Essentials for every care sheet:

Acclimation instructions: How to float the bag, how to gradually introduce pond water, how long to acclimate, what signs indicate the fish is stressed. Many post-sale phone calls are about fish that were not acclimated correctly.

Your quarantine recommendation: Explicitly state whether you recommend the buyer quarantine the fish before introducing them to an established pond, and for how long. Some customers will ignore this advice, but your having given it in writing matters professionally.

Water parameter targets: Temperature range, pH, KH, ammonia, nitrite, nitrate. The parameters should match the fish you're selling -- if you're selling into northern markets, include the winter temperature management guidance.

Feeding guidance: What to feed, how much, how often, and what to do in different seasons. Overfeeding questions are one of the most common first-year koi keeper problems.

Signs of disease to watch for: A short list of the most important early disease indicators -- flashing, fin clamping, surface gasping, unusual swimming behavior. Catching problems early requires knowing what to look for.

Contact information: Your phone number or email for fish health questions. This shows confidence in your fish and builds customer trust.

What documentation should I give koi customers? At minimum: a quarantine certificate, a species and care-specific care sheet, and a purchase receipt that includes the fish's lot or individual identification number. For high-value fish, also include a watermarked reference photo.

How to Create Care Sheets for Different Varieties

Care sheets for specific varieties can note variety-specific considerations. Some examples:

Goshiki: Note the dramatic color change with temperature -- the fish will look much darker in cold water and lighter in warm water. This is normal, not a disease sign. Customers who don't know this call in a panic in autumn.

Butterfly koi (long-fin): Note the additional fin injury risk and the need to avoid keeping them with fish that nip fins.

Gin-Rin varieties: Note that the sparkling scale effect is most visible in certain lighting conditions -- customers may worry the fish "doesn't look right" if they observe it in low light.

Very pale varieties (Platinum Ogon, Shiro Bekko): Note the UV sensitivity and recommend adequate pond depth with shade options.

A modular care sheet template with a standard base and variety-specific inserts is the most efficient approach for operations that handle multiple varieties.

Should You Include Quarantine Requirements on the Care Sheet?

Yes, explicitly. State clearly that you recommend the customer quarantine new fish before introducing them to an established pond, and give a specific timeframe (30 days minimum) and the reasoning (disease prevention, parasite detection). Include basic quarantine setup requirements.

Some customers will quarantine. Many won't -- especially first-time buyers who just want to get their new fish in the pond. But stating the recommendation in writing serves three purposes: it's professionally responsible, it protects you if they don't quarantine and encounter disease, and the customers who do follow it will have better outcomes that translate to loyalty and referrals.

Purchase Receipt and Fish Identification

The purchase receipt should include:

Date of sale
Fish variety, size, and if applicable, the individual fish identifier or lot number
Purchase price
Any warranty terms you offer (be very specific about conditions and duration)
Your contact information

For valuable individual fish, attach a watermarked reference photo to the receipt. This prevents disputes about whether the delivered fish is the one that was purchased.

Digital vs. Physical Documentation

Provide both. Many customers prefer a physical packet they can reference without needing their phone. But also email the documentation -- this creates a timestamped record that you sent it, and ensures the customer has it accessible.

Email delivery also creates a contact record for future follow-up. The customer's email in your system is the basis for announcing new arrivals, following up on fish welfare, and building ongoing relationships.

Frequently Asked Questions

What documentation should I give koi customers?

Every customer should receive three things: a quarantine/health certificate showing what testing and treatment was performed before sale, a care sheet with species-appropriate guidance for acclimation, water parameters, feeding, and disease signs to watch for, and a purchase receipt with the fish identifier and any warranty terms. For high-value individual fish, add a watermarked reference photo. KoiQuanta generates care sheets and quarantine certificates from your fish records, ensuring the documents reflect your actual logged data.

How do I create a care sheet for different koi varieties?

Build a modular template with a standard base (acclimation, water parameters, feeding, disease observation, contact information) and add variety-specific sections for care notes that differ by fish. For example: Goshiki customers need to know about the dramatic color change with temperature, butterfly koi customers need to know about fin injury risk, and pale-skinned varieties need UV sensitivity notes. Start with your most commonly sold varieties and build variety-specific sections from there. KoiQuanta's fish profile system includes variety-specific care notes that can be pulled into customer documents.

Should I include quarantine requirements on the care sheet?

Yes. State explicitly that you recommend quarantine for 30 days before introducing new fish to an established pond, explain why (disease prevention and parasite detection), and give basic setup requirements. Most customers won't follow this advice -- but the customers who do will have better outcomes, and you've protected yourself professionally by giving it. If a customer doesn't quarantine and subsequently claims disease from your fish, your care sheet showing you recommended quarantine is a relevant document in that conversation.

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Sources

Associated Koi Clubs of America (AKCA)
Koi Organisation International (KOI)
University of Florida IFAS Extension Aquaculture Program
Fish Vet Group
Water Quality Association