The behaviour of Loligo opalescens (Mollusca : Cephalopoda) as observed bya remotely operated vehicle (ROV)

The behaviour of Loligo opalescens as observed by a remotely operated vehic le (ROV) was analysed. Thirty-nine behavioural components were identified a nd classed into four categories: chromatic, postural, locomotory, and inkin g. The frequency with which components were expressed was correlated to whe ther or not an individual was schooling, shoaling, alone with the ROV, or i n the presence of other species. Behaviours observed were compared to those reported for other Loligo species. Observations of schooling and feeding b ehaviour, and reactions to other species are included.