++++ 1.Fishing - Common structural policy - Conservation of the resources of the sea - Fishing quota system - Regulation by a Member State of the use of its quotas - Grant of licences - Composition of crews of vessels registered in that State - Minimum proportion of Community citizens - Requirement to be paying contributions to the national social security scheme - Whether permissible - Requirement to reside ashore in the Member State concerned - Not permissible - Whether individuals may rely on the relevant provisions of Community law before the national court ( Council Regulation No 1408/71, Arts 13(2)(c ) and 14C, No 101/76, Art . 2(1 ), No 170/83, Art . 4, and No 172/83 ) 2.Free movement of persons - Worker - Concept - Existence of an employment relationship - Criteria of assessment - Persons paid a "share" - Included ( EEC Treaty, Art . 48 : 1985 Act of Accession, Art . 55 ) 3.Accession of new Member States to the Communities - Spain - Free movement of persons - Workers - Exemptions - Strict interpretation - Prohibition of the introduction of new restrictions regarding access to employment - Restrictions relating to employment on board fishing vessels - Whether permissible - Conditions ( 1985 Act of Accession, Arts 55 and 56(1 ); Regulation No 1612/68 of the Council, Arts 1 to 6 ).