In this Chapter—

• “fish” includes shellfish;

• “relevant authority” means—

  1. a

     in relation to the seizure of any object or property by an enforcement officer, the person or body on whose behalf the officer who seized it was acting;

  2. b

     in relation to the detention of a vessel by an enforcement officer, the person or body on whose behalf the officer who detained the vessel was acting;

• “relevant function”, in relation to an enforcement officer, means any function of that officer;

• “relevant offence”, in relation to an enforcement officer, means any offence in respect of which the officer has functions;

• “shellfish” includes crustaceans and molluscs of any kind;

• “vessel” includes any ship or boat or any description of vessel used in navigation.