++++ Fisheries - Conservation of marine resources - Measures for monitoring catches associated with the conservation policy - Not applicable to catches taken under agreements concluded between the Community and certain developing countries - Commission regulation extending to the waters of developing countries an obligation to make declarations imposed as part of the Community conservation system - Unlawful ( Council Regulations Nos 170/83 and 2241/87, Art . 10; Commission Regulation No 3151/87 )