HEID 85

Type Oceanographic cruise
Ship Thalassa
Ship owner Ifremer
Dates 05/11/1985 - 26/11/1985
Chief scientist(s) BIAIS Gérard, DINER Noël

IFREMER STATION DE LA ROCHELLE-L'HOUMEAU

Place du Séminaire

BP 7

17137 L'HOUMEAU

+33 (0)5 46.50.94.40

DOI 10.17600/85006611
Objective Establishment of an acoustic abundance index for the Downs herring stock that migrates at the end of the year to spawn in the area surveyed during HEID 85. This data (which forms the basis for stock assessments and proposals for authorised catches) is routinely collected as part of the Small Pelagics programme. Study of the characteristics of school echoes. In situ measurement of the herring reflection index. Recognition of the species detected using a video camera. Study of fish behaviour during the passage of the boat.