Suchergebnisse

Data on occurrence of Histioteuthis bonnellii and Histioteuthis reversa collected in the southern Tyrrhenian Sea from 1994 to 1998 during five trawl surveys of the Medits eight trawl survey of the Grund project are reported. The International bottom trawl survey (the MEDITS programme) has been designed from a European Commission's initiative to produce biological data on the demersal resources along the coasts of the four Mediterranean countries of the European Union (Spain, France, Italy and Greece). The main objective was to obtain independent knowledge useful for the fishery management, in an area where it is difficult to follow in detail the exploitation patterns of the fishing fleets. In Italian seas, before 1985, there was no research at national level on biological aspect and assessment of demersal resources. Within the framework of the first national plan (1985-1988) of the Law 41/82, three main research groups to assess demersal resources were organized: Tyrrhenyan group, Adriatic and Ionian group and Sicily group. All the seas were covered, with the exception of Ionian part of Sicily. The stratified random sample design was mainly used and five strata were chosen (0-50, 50-100, 100-200, 200-450 and 450-700m). During the third national plan all the researchers involved in trawl surveys were joined in one national group (GRUND: Gruppo Nazionale Demersali) and the same protocol for campaign, data collection and process was adopted by eleven Operative Units belonging to GRUND.