
1 
This Order may be cited as the Diseases of Fish Order 1973 and shall come into operation on 1st January 1974.
2 

(1) In this Order “the Act” means the Diseases of Fish Act 1937.
(2) The Interpretation Act 1889 shall apply to the interpretation of this Order as it applies to the interpretation of an Act of Parliament.
3 
The provisions of the Act shall apply with respect to the diseases named in the Schedule to this Order (being diseases affecting fish of the salmon family or freshwater fish) as those provisions apply with respect to furunculosis and columnaris.
4 
For the definitions of the expressions “infected” and “infected waters” contained in section 10(1) of the Act (as substituted by the Diseases of Fish Order 1966)) there shall be substituted the following definitions, that is to say—“

 ‘infected’ means, in relation to fish, infected with any of the diseases respectively known as furunculosis, columnaris, infectious pancreatic necrosis (IPN), viral haemorrhagic septicaemia (VHS or Egtved disease), Myxosoma (Lentospora) cerebralis (whirling disease), infectious haematopoietic necrosis (IHN), ulcerative dermal necrosis (UDN) and infectious dropsy of cyprinids (IDC or IAD) in any of its forms including spring viraemia and erythrodermatitis;
 ‘infected waters’ means waters in which any of the diseases mentioned in the definition of the expression “infected” exists among fish, or in which the causative organisms of any of those diseases are present;
”
W.G. Agnew

SCHEDULE
Article 3

Diseases to which the Act is extended:—
 Infectious pancreatic necrosis (IPN);
 Viral haemorrhagic septicaemia (VHS or Egtved disease);
 Myxosoma (Lentospora) cerebralis (whirling disease);
 Infectious haematopoietic necrosis (IHN);
 Ulcerative dermal necrosis (UDN); and
 Infectious dropsy of cyprinids (IDC or IAD) in any of its forms including spring viraemia and erythrodermatitis.
