Setting Up a Koi Dealer Quarantine Program

By KoiQuanta Editorial Team|Updated Mar 2026

Dealers with documented quarantine programs sell fish at average prices 20-30% higher than undocumented competitors. This isn't correlation -- it's causation. Buyers who understand what they're paying for pay a premium for fish they can trust. A quarantine program is the operational infrastructure that creates that trust, and the documentation is what makes the trust verifiable.

This guide covers how to build a dealer quarantine program from infrastructure through protocols, record-keeping, and customer communication.

TL;DR

If you receive 100 fish in a typical delivery, you need quarantine capacity for 100 fish at appropriate stocking density, plus you need existing quarantine batches to have their own space.
Quarantine at 18-20°C is typical for diagnosis and most treatments.
"All our fish go through a 6-week quarantine with weekly parasite screening, treatment as needed, and a documented health history" is compelling.
Early detection based on parameter trends reduces treatment costs and fish stress.
Seasonal changes require adjusted monitoring schedules; automated reminders help maintain consistency.

What a Dealer Quarantine Program Actually Is

A quarantine program is more than having fish sit in tanks for a few weeks. It's a systematic process with defined entry criteria, observation protocols, treatment decision-making, discharge criteria, and documentation at every step. A dealer quarantine program means:

Every fish entering the facility goes through a defined protocol, not fish-by-fish judgment calls.

The value of systemization is consistency. If you have 12 tanks of new fish arriving from three different sources and your protocol is "keep them for a while and see how they look," you'll make different decisions each time depending on pressure, experience, and attention that day. If your protocol is written and specific, outcomes are more predictable.

KoiQuanta dealer tier provides the complete infrastructure for a professional quarantine program -- intake forms, observation logs, treatment records, and discharge documentation in a format your customers can see.

Physical Quarantine Infrastructure

Separate facility: Your quarantine system needs to be physically separate from display stock. This means no shared equipment, no shared water, no cross-contamination risk. Keeping new arrivals in a separate building or clearly delineated quarantine area with its own equipment is the baseline.

Tank capacity: Size your quarantine capacity to your typical arrival volumes plus a reserve. If you receive 100 fish in a typical delivery, you need quarantine capacity for 100 fish at appropriate stocking density, plus you need existing quarantine batches to have their own space. Rushing fish through quarantine because tanks are full is how mistakes happen.

Filtration: Each quarantine system needs its own biological filtration. Cycled, stable filtration is critical because you'll often be using medications that stress the biofilter. Having established filtration gives you more buffer. See the koi quarantine tank cycling guide for approaches to maintaining cycled quarantine filtration.

Aeration: Maximum aeration in quarantine tanks. Many treatments reduce dissolved oxygen. Multiple air stones, a quality air pump -- don't compromise on this.

Heating: Koi disease diagnosis and treatment are both temperature-dependent. Having temperature control in your quarantine facility lets you optimize conditions for diagnostic accuracy and treatment efficacy. Quarantine at 18-20°C is typical for diagnosis and most treatments.

Equipment isolation: Separate nets, buckets, and handling equipment for each quarantine tank or zone. Equipment should be disinfectable between uses.

The Intake Protocol: First 24 Hours

What happens in the first 24 hours with new arrivals determines much of what follows.

Arrival assessment: Before fish go into tanks, assess each fish briefly for obvious problems. Note anything unusual. Fish in poor condition, with visible injuries, or showing disease signs get documented separately.

Acclimation: Float bags to temperature-match. Do not dump fish directly from bags into noticeably different water temperature. pH and chemistry matching is also important -- rapid pH change causes shock.

Initial parameters: Test the water in the quarantine tanks immediately before stocking. Document the starting baseline. If ammonia is already elevated from a previous batch, resolve it before adding more fish.

Stress dose salt: A low-level salt addition (0.1-0.15%) at intake reduces osmotic stress and provides mild antibacterial benefit. Note this in the treatment record as it affects subsequent calculations.

Do not treat on day one beyond supportive care. Fish are stressed from transport. Introducing medications on arrival adds additional stress. The exception is if fish arrive with obvious active disease -- but even then, supportive care and stabilization before treatment is usually better.

Observation Protocol

This is where most dealer quarantine programs fail. Observation needs to be structured, documented, and consistent.

Daily observation minimums:

Count all fish in each tank (confirms no mortality between formal inspections)
Note feeding response: are fish eating actively? Appetite is an early indicator of health status
Check for any fish showing abnormal behavior: flashing, surface crowding, altered posture, lethargy
Check fins and body surface for visible changes: new ulcers, fin fraying, color changes, white spots
Note any fish that look different from the day before

Formal inspection: At least weekly, net and physically examine a sample of fish from each tank. Look closely at fins, body surface, under the chin, and around the vent. In a dealer facility with experience and appropriate equipment, skin scrapes can be part of this formal inspection protocol.

Documentation: Write everything down. Date, tank number, observation notes, feeding response, any treatments administered. KoiQuanta's quarantine log captures all of this in a format that produces a timestamped record for each batch.

Treatment Decision-Making

Your quarantine program should specify when to treat, not leave it entirely to case-by-case judgment.

Prophylactic treatment: Most reputable dealer quarantine programs include prophylactic treatment for common external parasites at intake. A fluke treatment (Praziquantel) is standard for fish coming from Asia or other high-exposure sources. Some programs include a formalin or similar bath treatment at intake regardless of visible symptoms.

Decision thresholds for therapeutic treatment: Define the observation triggers that prompt treatment decisions. Examples:

Any fish showing flashing: skin scrape before treatment, treat based on identified parasite
Any fish with visible ulcer: isolation, bacterial treatment protocol initiated
Multiple fish showing surface crowding or gill flaring: emergency water quality check, then parasite investigation

Treatment record: Every treatment administered needs to be documented: drug name, dose, date, duration, fish or tank affected, and observed outcome. This is your evidence base and your compliance documentation.

Discharge Criteria

Discharge criteria define when fish are cleared to move to display stock or sold to customers. Without defined criteria, "clearing" quarantine becomes ambiguous.

Minimum quarantine duration: Define a minimum -- typically 4-6 weeks for domestic fish, 6-8 weeks for imports. No fish clears quarantine before this regardless of how good they look.

Health status at discharge: No active disease signs. Wounds fully healed if present. All treatments completed and withdrawal periods satisfied if using medications with withdrawal requirements.

Parasite status: Confirm parasite-negative before discharge, ideally through a recent scrape or observation period without flashing or other parasite behavior.

Documentation: Generate a discharge record showing when the fish entered quarantine, what treatments were administered, and that it met discharge criteria. This is the basis for your customer-facing quarantine certificate.

For the customer-facing quarantine certificate format and how to use it in customer communication, the koi dealer quarantine certificate guide covers documentation your customers receive.

Communicating Your Program to Customers

The quarantine program only generates the price premium if customers know about it.

Explain the program, don't just claim it: "We quarantine all fish" is not compelling. "All our fish go through a 6-week quarantine with weekly parasite screening, treatment as needed, and a documented health history" is compelling.

Provide quarantine records to customers: A one-page summary of what a fish went through in quarantine -- when it arrived, what treatments were administered, when it was cleared -- is a differentiator. Most dealers provide nothing. The ones who provide documentation are remembered.

Be honest about what quarantine doesn't guarantee: Responsible communication includes acknowledging that quarantine reduces but doesn't eliminate disease risk. Customers who understand this are better prepared and less likely to blame you when something happens.

Frequently Asked Questions

How do I create a quarantine program for my koi business?

Start with written protocols: intake procedure, daily observation requirements, treatment decision thresholds, and discharge criteria. Then build the physical infrastructure to support it: separate quarantine facility, tank capacity for typical arrival volumes, individual filtration per tank or zone, separate equipment. Implement a documentation system (KoiQuanta's dealer tier provides this) that captures intake data, observation logs, treatments, and discharge records. Roll out the program with staff training on the written protocols -- the program is only as consistent as the people following it. Review and refine the protocols every six months based on what's working and what isn't.

What records should a dealer quarantine program produce?

For each batch of fish, your program should produce: intake record (date of arrival, source, quantity, species, notes on condition at arrival); daily observation logs for the full quarantine period; treatment records for any prophylactic or therapeutic treatments (drug, dose, date, duration, outcome); any diagnostic records (scrape results, test results); and a discharge record showing the fish met your criteria before moving to display or sale. These records are valuable for your own troubleshooting, for compliance if you're an USDA registered importer, and as evidence of your standards when presented to customers.

How do I communicate my quarantine standards to customers?

Make your quarantine program visible and specific rather than a generic claim. Describe the process: duration, observation frequency, what treatments are administered prophylactically, and what criteria fish must meet to clear quarantine. Provide a quarantine summary document with each fish sold -- customers who receive this are far more likely to trust you and return. Train your staff to explain the quarantine program in conversation with customers. Consider displaying your quarantine facility (or photos of it) so customers can see that the claim is backed by actual infrastructure.