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Larvae and juveniles of Saddleback silver-biddy (Gerres limbatus Cuvier, 1830) were collected using a small seine net from the bank waters of the Tien Yen Estuary, Quang Ninh Province, in northern Vietnam. These larvae and juveniles are compressed and relatively slender. Weak spinations are present on the head and on the preopercle. | JOURNAL OF SCIENCE OF HNUE Chemical and Biological Sci. 2014 Vol. 59 No. 9 pp. 88-94 This paper is available online at http stdb.hnue.edu.vn MORPHOLOGICAL DESCRIPTION OF SADDLEBACK SILVER-BIDDY Gerres limbatus LARVAE AND JUVENILES FROM THE TIEN YEN ESTUARY VIETNAM Tran Trung Thanh1 Ta Thi Thuy2 and Tran Duc Hau1 1 Faculty of Biology Hanoi National University of Education 2 Faculty of Natural Sciences and Technology Hanoi College of Education Abstract. Larvae and juveniles of Saddleback silver-biddy Gerres limbatus Cuvier 1830 were collected using a small seine net from the bank waters of the Tien Yen Estuary Quang Ninh Province in northern Vietnam. These larvae and juveniles are compressed and relatively slender. Weak spinations are present on the head and on the preopercle. Teeth are visible on the tip of the lower jaw. A protractile mouth with a long ascending premaxillary process is observed in the fish. The gut is short and coiled. A small and inconspicuous gas bladder is present above the anterior portion of the gut. The gap between the vent and anal fin is large and decreases with growth. The main counting meristic characters are as follows D IX 10 A III 7 P 13 - 15 24 myomeres. The dorsal profile has four melanophores patches. Morphological comparisons with other congeneric species are also given in the present study. Keywords Saddleback silver-biddy early stages morphology Tien Yen Estuary. 1. Introduction The family Gerreidae consists of 8 genera and 44 species mainly distributed in sea water occasionally in brackish water and rarely in freshwater 7 . In Vietnam 9 species of the genus Gerres are dominant 8 and many of their larvae and those showing juvenile morphology have been reported 2 4 . A description of a G. lucidus juvenile about 11 mm BL was reported by Jeyaseelan 2 but the G. lucidus was considered to be a young specimen of G. limbatus 1 . Until now a juvenile specimen of G. limbatus has been sketched only by Jeyaseelan 2 and there has been no .
