Legal Requirements for Importing Koi to the USA

By KoiQuanta Editorial Team|Updated Mar 2026

State-level koi import restrictions vary - some states have stricter requirements than federal law. This gap between federal and state requirements is the most common source of compliance failures for koi importers who understand the federal framework but haven't checked state-level rules. A shipment legal under federal requirements can still be rejected at a state border if it doesn't meet that state's specific regulations.

KoiQuanta's import documentation module aligns with federal import requirements. No competitor addresses legal compliance for koi importers in this way.

TL;DR

Processing times vary but typically 2-6 weeks.
Japanese koi imports have specific requirements around KHV, Cyprinid herpesvirus 1 and 2, and Spring Viremia of Carp (SVC).
Post-import quarantine for koi from Japan is typically a minimum of 30 days.
The application is filed through APHIS's ePermits system and typically takes 2-6 weeks to process.
Seasonal changes require adjusted monitoring schedules; automated reminders help maintain consistency.

The Federal Framework for Koi Imports

Koi (Cyprinus carpio) imported into the United States are regulated under multiple federal authorities:

USDA APHIS (Animal and Plant Health Inspection Service): The primary federal authority for fish disease import regulation. APHIS issues import permits for live fish and maintains a list of reportable diseases. KHV (Koi Herpesvirus) is a reportable pathogen under APHIS regulations, meaning documented KHV-positive fish cannot be legally imported.

US Fish and Wildlife Service (USFWS): Administers the Lacey Act, which prohibits import of injurious wildlife species. Koi are on the Injurious Wildlife list for certain states, which creates state-level complications even for federally permitted imports. The USFWS Wildlife Inspectors at ports of entry inspect live fish shipments.

USDA Veterinary Services (VS): Issues import permits for live fish from specific countries and maintains bilateral agreements with exporting countries about health certification requirements.

US Customs and Border Protection (CBP): Administers entry documentation, clearing shipments that have USDA/USFWS approval.

For a koi import to legally enter the United States, it must satisfy all applicable federal agencies. A single agency rejection stops the shipment.

The APHIS Import Permit Process

Most commercial koi imports from Japan, Israel, and other significant exporting countries require an APHIS import permit. The permit application process:

Application submission: Apply through APHIS's online permit system (ePermits) well in advance of the planned import. Processing times vary but typically 2-6 weeks.

Country-specific requirements: APHIS maintains specific requirements for fish from different countries based on disease risk assessments. Japanese koi imports have specific requirements around KHV, Cyprinid herpesvirus 1 and 2, and Spring Viremia of Carp (SVC).

Health certificate requirement: Most permits require a health certificate from an accredited veterinarian in the country of origin, certifying the fish are from a disease-free facility and have tested negative for specified pathogens.

Port of entry designation: Import permits specify the port of entry. Fish cannot be redirected to a different port without permit amendment.

Do I Need a Permit to Import Koi?

For commercial imports: almost certainly yes. Any import of live koi above the de minimis threshold (a small number of fish for personal use, defined case-by-case by APHIS) requires either a permit or compliance with an approved exemption.

For personal imports of small numbers: the rules are more complex. Bringing a few koi back from Japan as a personal purchase is technically subject to federal regulations. APHIS inspectors have discretion in how they apply rules to personal imports, but undeclared live fish at ports of entry can be confiscated, and knowingly importing fish that don't meet health requirements is a federal offence.

If you're importing koi for any commercial purpose - resale, stocking your facility, breeding stock - treat it as a commercial import and follow the full permit process.

KHV Testing Requirements

Koi Herpesvirus is one of the key disease concerns for US regulators. Importing fish from KHV-risk countries requires:

Health certification from origin country
In some cases, PCR testing of fish before shipment
Compliance with any APHIS-specific KHV testing protocols in effect at the time of import

KHV is reportable under the USDA National Aquatic Animal Health Plan (NAAHP). Importers who knowingly bring in KHV-positive fish, or who import without required testing, face serious federal liability. If KHV is discovered post-import, APHIS has authority to require depopulation of affected fish and quarantine of the facility.

State-Level Restrictions

This is where many importers encounter unexpected problems. Several states have restrictions on koi imports that exceed federal requirements:

Wisconsin: Koi are prohibited as they are classified as a potentially injurious species to native fisheries.

Maine: Strict aquatic invasive species regulations restrict live fish imports.

California: California's Department of Fish and Wildlife has specific importation permits required for live fish, separate from federal permits.

Michigan: Has additional state health certification requirements for aquaculture imports.

Several Great Lakes states: Additional restrictions exist based on invasive carp concerns, even though koi are ornamental rather than feral.

Before importing into any state, check with that state's Department of Fish and Wildlife or equivalent aquaculture regulatory body. Federal compliance is necessary but not sufficient.

What Happens If Imported Koi Fail Health Inspection?

At the port of entry, APHIS and USFWS inspectors can:

Require additional documentation: If health certificates are incomplete or missing, you may have time to provide them.
Hold the shipment: For further testing or documentation completion.
Order destruction: Fish that test positive for KHV or other reportable diseases will typically be ordered destroyed. The importer bears the cost.
Refuse entry: The shipment is returned to the country of origin at the importer's expense.

There is no appeal process that holds fish while it's being resolved. Destruction orders are executed. This is why pre-shipment testing and documentation is so important - you cannot fix compliance failures after the fish are at the port.

Documentation Requirements

A compliant koi import shipment should include:

APHIS import permit (copy in the shipment, original filed)
Health certificate from origin country veterinarian, in English or with certified translation
Commercial invoice showing species, quantity, value, and origin
Packing list with species-specific information
USFWS Declaration for Importation (Form 3-177)
Country-of-origin documentation (for fish from Japan, documentation of the specific farm)
PCR test results if required by current APHIS protocols for the country of origin

KoiQuanta's import documentation module organises these requirements and tracks the documentation status for each import event. No compliance failure should come from lost or incomplete paperwork if the documentation process is managed systematically.

Working with Licensed Import Brokers

For first-time importers and for complex imports, working with a licensed customs broker and a broker who specialises in live animal imports is strongly recommended. Live animal import brokerage requires specific expertise - standard customs brokers may not understand the USDA/USFWS requirements.

Established koi import brokers maintain relationships with APHIS inspectors, know the current requirements for specific countries, and have experience handling the documentation process. Their fees are typically well below the cost of a single shipment failure.

Post-Import Quarantine

Federal and most state regulations require post-import quarantine for live fish. The specific requirements vary by permit, but most APHIS import permits include quarantine conditions - minimum quarantine duration, facility requirements, and reporting obligations.

Post-import quarantine for koi from Japan is typically a minimum of 30 days. During this period, fish must be maintained in a separate facility from the rest of your stock, and the facility should be secure against release of water or fish to the environment.

Log your post-import quarantine in KoiQuanta as a standard quarantine batch, with the import permit number and health certification reference linked to the fish records. This creates the documentation trail required for APHIS compliance and provides the health history record that supports future fish sales.

Frequently Asked Questions

What federal law governs koi imports to the USA?

Koi imports to the USA are governed primarily by USDA APHIS under the authority of the Animal Health Protection Act, which covers disease risk from live animal imports. USFWS administers the Lacey Act provisions that address injurious wildlife concerns. US Customs and Border Protection handles physical entry documentation. For koi specifically, APHIS is the primary regulatory contact - their import permit system manages the disease risk assessment and country-specific health certification requirements. KHV (Koi Herpesvirus) is listed under the USDA National Aquatic Animal Health Plan as a reportable pathogen, meaning imports from affected regions face specific testing and certification requirements.

Do I need a permit to import koi?

For commercial imports of any scale, yes. APHIS import permits are required for live koi from most countries for commercial purposes. The application is filed through APHIS's ePermits system and typically takes 2-6 weeks to process. Personal imports of small numbers of fish fall into a grey area, but undeclared live fish at ports of entry risk confiscation. If you're importing fish for resale, to stock a dealer or breeding facility, or for any commercial purpose, follow the full permit process. Also check the destination state's regulations before importing - several states have additional requirements beyond the federal permit.

What happens if imported koi fail health inspection?

If koi fail health inspection at the port of entry - either due to documentation deficiencies or positive disease testing - APHIS inspectors can hold the shipment for additional documentation, order further testing, refuse entry (with return to origin at importer's expense), or order destruction if a reportable disease like KHV is confirmed. Destruction orders are executed immediately with no appeal process that holds the fish pending resolution. The importer bears all costs including destruction. Pre-shipment PCR testing, complete documentation, and working with an experienced live animal import broker are the most effective risk mitigation measures.