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\section{Introduction}  Studies of the Adriatic Sea started in the early eigh- teenth eighteenth  century, although a few observations are reported earlier, and essentially concerned the coastal biological phenomenology, whereas open-sea observations began in the nineteenth century.Several aspects of such re- search have been reported by many authors in the past, so that more details can be found in their papers (D’Ancona and Picotti 1958; Pigorini 1968; Trotti 1969; Buljan and Zore-Armanda 1976; Zavodnik 1983; Ar- tegiani et al. 1993).