1 . FISHERIES - CONSERVATION OF THE RESOURCES OF THE SEA - EXCLUSIVE POWER OF THE COMMUNITY - FAILURE TO EXERCISE IT - IMPLEMENTATION OF NATIONAL CONSERVATION MEASURES - CONDITIONS - DUTY TO CONSULT THE COMMISSION AND TO ADHERE TO ITS VIEWPOINT ( ACT OF ACCESSION , ART . 102 ) 2 . COMMUNITY LAW - CONFLICTING NATIONAL LEGISLATIVE MEASURE - CRIMINAL CONVICTION - INCOMPATIBILITY WITH COMMUNITY LAW - NATIONAL RULES IN CONFORMITY WITH COMMUNITY OBLIGATIONS - PERMISSIBLE PENALTY 3 . MEASURES ADOPTED BY THE INSTITUTIONS - APPLICATION RATIONE TEMPORIS - RETROACTIVITY OF A RULE OF SUBSTANTIVE LAW - CONDITIONS 4 . FISHERIES - CONSERVATION OF RESOURCES OF THE SEA - TECHNICAL CONSERVATION MEASURES - REGULATION NO 2527/80 AND SUBSEQUENT REGULATIONS EXTENDING ITS VALIDITY - RETROACTIVITY - ABSENCE THEREOF ( COUNCIL REGULATION ( EEC ) NO 2527/80 )