Chapter 10.3.

gyrodactylosis
(Gyrodactylus salaris)

Article 10.3.1.

For the purposes of the Aquatic Code, gyrodactylosis means infection with the viviparous freshwater ectoparasite Gyrodactylus salaris (G. salaris) (Phylum Platyhelminthes; Class Monogenea).

Information on methods for diagnosis are provided in the Aquatic Manual.

Article 10.3.2.

Article 10.3.3.

1. When authorising the importation or transit of the following commodities, the Competent Authorities should not require any gyrodactylosis related conditions, regardless of the gyrodactylosis status of the exporting country, zone or compartment:

   1. For the species referred to in Article 10.3.2. intended for any purpose:

      1. commodities treated in a manner that inactivates the disease agent e.g. leather made from fish skin, pasteurised products and some ready-to-eat meals; and fish oil and fish meal intended for use in feed;

      2. chilled products of fish, where the head, fins and skin have been removed;

      3. biological samples preserved for diagnostic applications in such a manner as to inactivate the disease agent.

   2. The following commodities destined for human consumption from the species referred to in Article 10.3.2. that have been prepared and packaged for direct retail trade:

      1. fish (chilled or frozen);

      2. fillets or cutlets (chilled or frozen);

      3. dried fish (including air dried, flame dried and sun dried);

      4. smoked salmonids.

   For the commodities referred to in point 1b), OIE Members may wish to consider introducing internal measures to address the risks associated with the commodity being used for any purpose other than for human consumption.

2. When authorising the importation or transit of commodities of a species referred to in Article 10.3.2., other than those referred to in point 1 of Article 10.3.3., the Competent Authorities should require the conditions prescribed in Articles 10.3.7. to 10.3.12. relevant to the gyrodactylosis status of the exporting country, zone or compartment.

3. When considering the importation/transit from an exporting country, zone or compartment not declared free of gyrodactylosis of any live commodity from a species not covered in Article 10.3.2. but which could reasonably be expected to be a potential mechanical vector for G. salaris, the Competent Authorities should conduct a risk analysis in accordance with the recommendations in the Aquatic Code. The exporting country should be informed of the outcome of this assessment.

Article 10.3.4.

A country may make a self-declaration of freedom from gyrodactylosis if it meets the conditions in points 1, 2, 3 or 4 below.

If a country shares a zone with one or more other countries, it can only make a self-declaration of freedom from gyrodactylosis if all the areas covered by the shared watercourse(s) are declared gyrodactylosis free countries or zones (see Article 10.3.5.).

1. A country where none of the susceptible species is present may make a self-declaration of freedom from gyrodactylosis when basic biosecurity conditions have been continuously met in the country for at least the past 2 years.

OR

2. A country where the species referred to in Article 10.3.2. are present but there has been no observed occurrence of the disease for at least the past 10 years despite conditions that are conducive to its clinical expression, as described in the corresponding chapter of the Aquatic Manual, may make a self-declaration of freedom from gyrodactylosis when basic biosecurity conditions have been continuously met in the country for at least the past 10 years.

OR

3. A country where the last observed occurrence of the disease was within the past 10 years or where the infection status prior to targeted surveillance was unknown (e.g. because of the absence of conditions conducive to its clinical expression as described in the corresponding chapter of the Aquatic Manual) may make a self-declaration of freedom from gyrodactylosis when:

   1. basic biosecurity conditions have been continuously met for at least the past 5 years; and

   2. targeted surveillance, as described in Chapter 1.4. of the Aquatic Code, has been in place for at least the last 5 years without detection of G. salaris.

OR

4. A country that has previously made a self-declaration of freedom from gyrodactylosis but in which the disease is subsequently detected may make a self-declaration of freedom from gyrodactylosis again when the following conditions have been met:

   1. on detection of the disease, the affected area was declared an infected zone and a buffer zone was established; and

   2. infected populations have been destroyed or removed from the infected zone by means that minimise the risk of further spread of the disease, and the appropriate disinfection procedures (see Aquatic Manual) have been completed, or the waters containing the infected fish have been treated by chemicals that kill the parasite; and

   3. targeted surveillance, as described in Chapter 1.4. of the Aquatic Code, has been in place for at least the last 5 years without detection of G. salaris; and

   4. previously existing basic biosecurity conditions have been reviewed and modified as necessary and have continuously been in place for at least the past 5 years.

   In the meantime, part of the non-affected area may be declared a free zone provided that such part meets the conditions in point 3 of Article 10.3.5.

Article 10.3.5.

A zone or compartment within the territory of one or more countries not declared free from gyrodactylosis may be declared free by the Competent Authority(ies) of the country(ies) concerned if the zone or compartment meets the conditions referred to in points 1, 2, 3 or 4 below.

If a zone or compartment extends over more than one country, it can only be declared a gyrodactylosis free zone or compartment if all the Competent Authorities confirm that the conditions have been met.

1. A zone or compartment where none of the susceptible species is present may be declared free from gyrodactylosis when basic biosecurity conditions have been continuously met in the zone or compartment for at least the past 2 years.

OR

2. A zone or compartment where the species referred to in Article 10.3.2. are present but there has been no observed occurrence of the disease for at least the past 10 years despite conditions that are conducive to its clinical expression, as described in the corresponding chapter of the Aquatic Manual, may be declared free from gyrodactylosis when basic biosecurity conditions have been continuously met in the zone or compartment for at least the past 5 years.

OR

3. A zone or compartment supplied with seawater with a salinity of at least 25 parts per thousand may be declared free from gyrodactylosis provided that no live aquatic animals of species referred to in Article 10.3.2. are introduced from a site of a lesser health status for G. salaris during the 14 days prior to any live fish transfers from the zone or compartment.

OR

4. A zone or compartment where the last observed occurrence of the disease was within the past 10 years or where the infection status prior to targeted surveillance was unknown (e.g. because of the absence of conditions conducive to its clinical expression as described in the corresponding chapter of the Aquatic Manual) may be declared free from gyrodactylosis when:

   1. basic biosecurity conditions have been continuously met for at least the past 10 years; and

   2. targeted surveillance, as described in Chapter 1.4. of the Aquatic Code, has been in place for at least the last 5 years without detection of G. salaris.

OR

5. A zone previously declared free from gyrodactylosis but in which the disease is subsequently detected may be declared free from gyrodactylosis again when the following conditions have been met:

   1. on detection of the disease, the affected area was declared an infected zone and a buffer zone was established; and

   2. infected populations have been destroyed or removed from the infected zone by means that minimise the risk of further spread of the disease, and the appropriate disinfection procedures (see Aquatic Manual) have been completed, or the waters containing the infected fish have been treated by chemicals that kill the parasite; and

   3. targeted surveillance, as described in Chapter 1.4. of the Aquatic Code, has been in place for at least the last 5 years without detection of G. salaris; and

   4. previously existing basic biosecurity conditions have been reviewed and modified as necessary and have continuously been in place for at least the past 5 years.

Article 10.3.6.

A country, zone or compartment that is declared free from gyrodactylosis following the provisions of points 1 or 2 of Articles  10.3.4. or 10.3.5. (as relevant) may maintain its status as gyrodactylosis free provided that basic biosecurity conditions are continuously maintained.

A country, zone or compartment that is declared free from gyrodactylosis following the provisions of point 3 of Article 10.3.4. or point 4 of 10.3.5. (as relevant) may discontinue targeted surveillance and maintain its status as gyrodactylosis free provided that conditions that are conducive to clinical expression of gyrodactylosis, as described in the corresponding chapter of the Aquatic Manual, exist, and basic biosecurity conditions are continuously maintained.

However, for declared free zones or compartments in infected countries and in all cases where conditions are not conducive to clinical expression of gyrodactylosis, targeted surveillance needs to be continued at a level determined by the Competent Authority on the basis of the likelihood of infection.

Article 10.3.7.

When importing live aquatic animals of species referred to in Article 10.3.2. from a country, zone or compartment declared free from gyrodactylosis, the Competent Authority of the importing country should require an international aquatic animal health certificate issued by the Competent Authority of the exporting country or a certifying official approved by the importing country attesting that, on the basis of the procedures described in Articles 10.3.4. or 10.3.5. (as applicable), the place of production of the aquatic animal is a country, zone or compartment declared free from gyrodactylosis.

The certificate should be in accordance with the Model Certificate in Chapter 5.10.

This Article does not apply to commodities referred to in point 1 of Article 10.3.3.

Article 10.3.8.

1. When importing, for aquaculture, live aquatic animals of species referred to in Article 10.3.2. from a country, zone or compartment not declared free from gyrodactylosis, the Competent Authority of the importing country should:

   1. require an international aquatic animal health certificate issued by the Competent Authority of the exporting country attesting that:

      1. the aquatic animals have been held, immediately prior to export, in water with a salinity of at least 25 parts per thousand for a continuous period of at least 14 days; and

      2. no other live aquatic animals of the species referred to in Article 10.3.2. have been introduced during that period;

      OR

      3. in the case of eyed eggs, the eggs have been disinfected by a method demonstrated to be effective against G. salaris;

   OR

   2. assess the risk and apply risk mitigation measures such as:

      1. the direct delivery to and lifelong holding of the consignment in biosecure facilities for continuous isolation from the local environment;

      2. if breeding from the imported fish, disinfection of the fertilised eggs by a method demonstrated to be effective against G. salaris, and complete separation of the hatched progeny from the imported animals;

      3. the treatment of all effluent and waste materials in a manner that ensures inactivation of G. salaris.

2. If the intention of the introduction is the establishment of a new stock, the Code of Practice on the Introductions and Transfers of Marine Organisms of the International Council for the Exploration of the Seas (ICES) should be followed.

3. For the purposes of the Aquatic Code, the ICES Code (full version see: http://www.ices.dk/indexfla.asp) may be summarised to the following main points:

   1. identify stock of interest (cultured or wild) in its current location;

   2. evaluate stock’s health/disease history;

   3. take and test samples for G. salaris, pests and general health/disease status;

   4. import and quarantine in a secure facility a founder (F-0) population;

   5. produce F-1 generation from the F-0 stock in quarantine;

   6. culture F-1 stock and at critical times in its development (life cycle) sample and test for G. salaris and perform general examinations for pests and general health/disease status;

   7. if G. salaris is not detected, pests are not present, and the general health/disease status of the stock is considered to meet the basic biosecurity conditions of the importing country, zone or compartment, the F-1 stock may be defined as gyrodactylosis free or specific pathogen free (SPF) for G. salaris;

   8. release SPF F-1 stock from quarantine for aquaculture or stocking purposes in the country, zone or compartment.

This Article does not apply to commodities referred to in point 1 of Article 10.3.3.

Article 10.3.9.

When importing, for processing for human consumption, live aquatic animals of species referred to in Article 10.3.2. from a country, zone or compartment not declared free from gyrodactylosis, the Competent Authority of the importing country should:

1. require an international aquatic animal health certificate issued by the Competent Authority of the exporting country attesting that the aquatic animals have been held, immediately prior to export, in water with a salinity of at least 25 parts per thousand for a continuous period of at least 14 days, and no other live fish of the species listed in Article 10.3.2. have been introduced during that period;

OR

2. require that the consignment be delivered directly to and held in quarantine facilities for slaughter and processing to one of the products referred to in point 1 of Article 10.3.3. or other products authorised by the Competent Authority, and all effluent and waste materials be treated in a manner that ensures inactivation of G. salaris.

This Article does not apply to commodities referred to in point 1 of Article 10.3.3.

Article 10.3.10.

When importing, for use in animal feed, or for agricultural, industrial or pharmaceutical use, live aquatic animals of species referred to in Article 10.3.2. from a country, zone or compartment not declared free from gyrodactylosis, the Competent Authority of the importing country should:

1. require an international aquatic animal health certificate issued by the Competent Authority of the exporting country attesting that the aquatic animals have been held, immediately prior to export, in water with a salinity of at least 25 parts per thousand for a continuous period of at least 14 days, and no other live aquatic animals of the species referred to in Article 10.3.2. have been introduced during that period;

OR

2. require that the consignment be delivered directly to and held in quarantine facilities for slaughter and processing to one of the products referred to in point 1 of Article 10.3.3. or other products authorised by the Competent Authority, and all effluent and waste materials be treated in a manner that ensures inactivation of G. salaris.

This Article does not apply to commodities referred to in point 1 of Article 10.3.3.

Article 10.3.11.

When importing aquatic animal products of species referred to in Article 10.3.2. from a country, zone or compartment declared free from gyrodactylosis, the Competent Authority of the importing country should require an international aquatic animal health certificate issued by the Competent Authority of the exporting country or a certifying official approved by the importing country attesting that, on the basis of the procedures described in Articles 10.3.4. or 10.3.5. (as applicable), the place of production of the commodity is a country, zone or compartment declared free from gyrodactylosis.

The certificate should be in accordance with the Model Certificate in Chapter 5.10.

This Article does not apply to commodities referred to in point 1 of Article 10.3.3.

Article 10.3.12.

When importing aquatic animal products of species referred to in Article 10.3.2. from a country, zone or compartment not declared free from gyrodactylosis, the Competent Authority of the importing country should assess the risk and apply appropriate risk mitigation measures.

1. In the case of dead aquatic animals, whether eviscerated or uneviscerated, such risk mitigation measures may include:

   1. the direct delivery into and holding of the consignment in biosecure facilities for processing to one of the products referred to in point 1 of Article 10.3.3. or other products authorised by the Competent Authority;

   2. the treatment of all effluent and waste materials in a manner that ensures inactivation of G. salaris.

OR

2. The Competent Authority of the importing country should require an international aquatic animal health certificate issued from the Competent Authority of the exporting country attesting that the product was derived from aquatic animals which had been held, immediately prior to processing, in water with a salinity of at least 25 parts per thousand for a continuous period of 14 days, and no other live aquatic animals of the species referred to in Article 10.3.2. have been introduced during that period.

This Article does not apply to commodities referred to in point 1 of Article 10.3.3.