The right of Fishery Officers to enter and cross lands are primarily addressed in the 1959 Fisheries Consolidation Acts as amended.

The key sections – there are some others but these are the main ones are as follows:

  1. Powers of Authorised person:

296.—(1) Any authorised person may, for the purposes of the protection of the fisheries, do all or any of the following things:—

 
   

(a) enter into and pass through or along the banks or borders of any lakes or rivers frequented by salmon or trout or of the tributaries thereof,

   

(b) with boats or otherwise enter upon any such lakes or rivers,

   

(c) enter upon and examine all weirs, sluices, mill dams, mill races and watercourses communicating with such lakes or rivers,

   

(d) enter any boat engaged or about to engage in fishing,

   

(e) examine all standing, floating or other nets whatsoever,

   

(f) seize any unlawful fishing engine or any lawful fishing engine which is being unlawfully used,

   

(g) do all such other acts and things as he is authorised to do by or under this Act.

(2)   Nothing in this section shall be construed as authorising any authorised person to enter any enclosed garden or any dwelling house or the curtilage thereof except where the ordinary road or passage to any weir, dam or dyke is through such garden or curtilage.

     

And also under Authorised Officer powers:

301.—(1) In this section the expression “authorised officer” means any person being—

 
   

(a) a member of the Garda Síochána, or

   

(b) an officer or servant of a board of conservators authorised in writing by that board to exercise the powers conferred by this section, or

   

(c) an officer of the Minister, authorised in writing by the Minister to exercise the powers conferred by this section, or

   

(d) an officer or servant of the Electricity Supply Board authorised in writing by the Minister to exercise the powers conferred by this section.

   

(2) Every authorised officer is hereby authorised to do all or any of the following things:—

   

(a) to stop and search any person conveying or suspected to be conveying fish of any kind or any instrument or substance used or adapted for taking fish unlawfully and to inspect any fish, instrument or substance which such person is found to be conveying and for that purpose to open and search any vehicle or package in which such fish, instrument or substance is or may be or is believed to be conveyed;

   

(b) at all reasonable times to enter upon and have free access to the interior of—

   

(i) any premises in which fish is or is believed to be sold, or kept, exposed or stored for sale, or

   

(ii) any premises in which poison or explosive intended for the destruction of fish is or is believed to be kept, or

   

(iii) the premises of any person engaged in the business of carrying goods for reward, or

   

(iv) any aerodrome, pier, quay, wharf, jetty, dock or dock premises, or

   

(v) any ship, boat, aircraft, railway wagon, motor lorry, cart, or other vessel or vehicle used for the conveyance of goods;

   

(c) to examine all fish found in any place which he is authorised by this section to enter and for that purpose to open any package found in such place and containing or believed to contain fish;

   

(d) to stop, enter and search, on any river, lake or estuary, or the shores thereof or any part of the sea or the shores thereof any boat used or believed to be used for fishing or containing or suspected of containing fish unlawfully captured and to examine all fish and all fishing engines found therein and for that purpose to open any package which contains or is suspected of containing any fish or fishing engine;

   

(e) to take, remove and detain in his custody any fish (either together with or without any package in which the same may be contained) found in the course of the exercise of any of the powers conferred by this section in respect of which an offence under this Act is being or is suspected of being committed or which have been or are suspected of having been unlawfully captured;

   

(f) to take, remove and detain in his custody any fishing engine or any article liable or believed to be liable to forfeiture under this Act;

   

(g) to demand and take the name and address of the person having custody of any fish or other article which the authorised officer is authorised under this section to examine and also demand and take from such person the name and address of the owner of such fish or other article.