TAILIEUCHUNG - Morphological description of lateolabrax SP. Juveniles from the Tien Yen and Kalong estuaries, Vietnam

A survey was carried out in January and February, 2011, in the Tien Yen and Kalong estuaries, at which time a number of larvae and juveniles of Lateolabrax were collected, and this Vietnamese sea bass was found to differ morphomeristically with its congener (., L. latus, L. japonicas and L. sp1.). This paper will for the first time describe the morphology of Lateolabrax juveniles (L. sp2.) found in what is now thought to be the southern limit of their habitat. | JOURNAL OF SCIENCE OF HNUE Chemical and Biological Sci. 2013 Vol. 58 No. 9 pp. 157-162 This paper is available online at http MORPHOLOGICAL DESCRIPTION OF Lateolabrax SP. JUVENILES FROM THE TIEN YEN AND KALONG ESTUARIES VIETNAM Tran Duc Hau Faculty of Biology Hanoi National University of Education Abstract. Juveniles of Lateolabrax sp 2. were collected using a small seine net from waters along the banks of the Kalong and Tien Yen estuaries in northern Vietnam. This juvenile is compact and relatively slender. The number of dorsal and anal fin rays was counted to be 25 - 27 and 10 - 11 respectively. Head spines occur on the supraorbital lachrymal preopercle interopercle supracleithrum and posttemporal bones. The melanophore pattern in juvenile is relatively undeveloped. The melanophores are found at the snout tip and the lower jaw tip at the lower end of the preopercle along the sides of body and along the dorsal and ventral margins of the tail. Vietnamese sea bass juveniles are very similar in general morphology to those of the other species in the Lateolabrax group but can be distinguished from the others as follows from Lateolabrax latus in having fewer dorsal and anal fin rays a shorter snout the presence of head spinations . serras on the supraorbital lachrymal vs. absent in L. latus and the lack of a broken line of melanophores on the lateral midlines from Lateolabrax japonicas by having a shorter snout and less developed melanophores on the peduncle and from the Chinese sea bass Lateolabrax sp1. by having heavier melanophores on the ventral margin of the trunk on the tail and on the lower jaw. Keywords Lateolabrax juveniles morphology estuary Vietnam. 1. Introduction The genus Lateolabrax Bleeker 1857 a member of the sea bass family Moronidae 6 containing three species is distributed in East Asia. The Japanese sea bass Lateolabrax japonicas is distributed in the coastal waters of Japan and the Southern coast of Korea Peninsula to the East

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