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¹ Ege University, Faculty of Fisheries, 35100, Bornova, Izmir, Turkey DOI : 10.4194/1303-2712-v12_2_20 Viewed : 4046 - Downloaded : 3165 Two adult female of Ocythoe tuberculata were caught in April 2002 (Mantle length, ML=285 mm) and in May 2003 (ML= 335 mm) in Izmir Bay, Aegean Sea the second one being the biggest individual ever found in all oceans as well as it had the highest known fecundity for the entire order Octopoda – around one million. Relations between mantle length (ML) to total weight (TW) was calculated as TW=0.0061*ML^2.231, and to lower hood length (LHL) was as ML= 18.85*LHL-31.633. For this species relation between mantle length body weight and beak measurements were calculated for the first time using our unpublished and literature data. Keywords : Ocythoe tuberculata, beak, fecundity