First documented record of Lampris guttatus (Brünnich, 1788) opah, in Greek seas APOSTOLOS I. SINIS 1 Laboratorio de Hidrobiolog£a Experimental, Departamento de Zoolog£a, Escuela Nacional de Ciencias Biol½gicas. Instituto Politécnico Nacional. Prol. De M. Carpio y Plan de Ayala s/n. 11340. Mexico, D. F. 2 Universidad Aut½noma Metropolitana-Iztapalapa. Av. San Rafael Atlixco 186. 09340. Mexico, D. F.   Abstract In the present study, the occurrence of the fish Lampris guttatus in Greek seawaters was documented with the capture of a single individual off the Chalkidiki Peninsula. The specimen had a total length of 86 cm, a maximum height of 46 cm and weighed 20.52 kg. Gonads were absent. Age was determined to be up to 2 years. The species was characterized as very rare for the region. A previous record of the species has been made in 1948, but the report was not well-documented, and thus the present work is considered to be the first conclusive report on the presence of the species in the seas of Greece.   < back .