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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species relation between mantle length body weight and beak measurements were calculated for the first time using our unpublished and literature data.

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Shortfin mako, Isurus oxyrinchus Rafinesque, 1810, is one of the commercially and recreationally important shark species in the world. Still knowledge on its biology and status is limited in the eastern Mediterranean. Three individuals were caught from Turkish waters. Two individuals (one female and one male) stomach contents, morphological measurements and female' gonad histology were studied. According to the results from macroscopic examination and gonad histology, the female was a Stage 1-immature, and smallest female ever recorded from Turkish waters. In addition, phylogenetic network of mitochondrial haplotypes was constructed for all three individuals. The phylogenetic network analysis supported that the species having a metapopulation as mentioned in previous studies. Since every information is critical for development of conservation actions aiming endangered species, we believe that our study will contribute to the limited knowledge on I. oxyrinchus biology and reproduction habits in Eastern Mediterranean

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