Subsection (1) provides for provision to be made by Order in Council for or in connection with the conservation, management and exploitation of salmon, trout, eels and freshwater fish in the Border rivers (as defined in subsection (4)).  This extends to fishing for all species commonly found in freshwater, including notably the two species of most commercial importance in these rivers (i.e. salmon and trout).  It is intended that such an Order in Council would include provision to establish management structures and procedures for such bodies; to establish rules applying directly to fishing activity (e.g. permitted fishing gear, close seasons); to levy charges to recover the costs of fisheries management; to create offences and empower enforcement authorities for the river and its catchment area; and to regulate such activities as may impact on fishing (e.g. dams and offtakes).
Subsection (2) provides that an Order in Council under subsection (1) may exclude the application of section 53 in relation to any Border rivers function, and may confer power to make subordinate legislation.  Section 53 would otherwise transfer to the Scottish Ministers any function of a Minister of the Crown so far as it is exercisable within devolved competence.
Subsection (3) provides that an Order in Council under subsection (1) may confer functions on a Minister of the Crown, the Scottish Ministers or a public body in relation to the Border rivers, provide for existing functions to be exercisable by some other person, and provide for functions to be exercisable concurrently or jointly with, with the agreement of, or after consultation with, some other person.
Subsection (4) contains definitions particular to this section.  Definitions of the fish species rely on the Salmon and Freshwater Fisheries Act 1975.  In that Act:
	Eels includes elvers and the fry of eels.
	Freshwater fish means any fish living in fresh water exclusive of salmon and trout and of any kinds of fish which migrate to and from tidal waters, and of eels.
	Salmon means all fish of the salmon species and includes parts of salmon.
	Trout means any fish of the salmon family commonly known as trout, including migratory trout and char, and also includes part of a trout.
This provides a comprehensive definition of fish species to be subject to management regulations made by Order in Council.
“The River Tweed” is defined by reference to section 39 of the Salmon and Freshwater Fisheries Act 1975, which in turn refers to the definition contained in the Tweed Fisheries (Amendment) Act 1859, as itself amended by any bye-laws amending that definition.  Section II of the 1859 Act defines the Tweed to include “every river, brook or stream which flows into the said river, and also the mouth or entrance of the said river, as described and defined in the Act”.  Section IV of that Act (as amended by a Byelaw dated 30 September 1863) made under the Salmon Fisheries (Scotland) Act 1863 defines the mouth or entrance of the Tweed (commonly known as the Tweed Box) to include an area extending 5 miles out to sea and from the Scottish border to a point 7 miles south of the Queen Elizabeth pier in Berwick.
“The River Esk” is not otherwise defined in statute, and is therefore defined as being the river which, for part of its length, constitutes the border between England and Scotland; including its tributary streams (including the River Sark and its tributary streams) and such waters on the landward side of its estuary limits as are determined by an Order under subsection (1), together with its banks.
Subsection (5) provides that an Order under subsection (1) may modify the definition of the rivers Tweed and Esk contained in subsection (4) above.
This power has been exercised in making the Scotland Act 1998 (Border Rivers) Order 1999 (S.I. 1999/1746).
Commentary Part V: Miscellaneous and General Details