First record of Tylosurus crocodilus (Péron & Lesueur 1821)(Pisces:Belonidae) in the Mediterranean (North Aegean Sea, Greece) APOSTOLOS I. SINIS Department of Zoology, School of Biology, Aristotle University, 541 24 Thessaloniki, Greece Abstract The presence of Tylosurus crocodilus is reported for the first time in the Mediterranean Sea (North Aegean Sea). This adds another record to the existing list of Lessepsian fish immigrants. One individual was caught on the 25th of July 2003 off the Gerakini beach area (Chalkidiki Peninsula). Its total length and weight were 91.5 cm and 802.5 g, respectively. Its stomach was empty and no gonads were found. Scale reading indicated three annual rings, the first of which was not apparent for all scales examined.   < back .