Nguyen Quoc Vinh, Ly Van Vuong, Vo Thi Thanh Lam, Nguyen Thi Kim Han, Dinh Minh Quang

Main Article Content

Abstract

This study was conducted in the Tra Su area (An Giang Province) to contribute information on the morphological traits and feeding habits of Helostoma temminckii, a commercially valuable fish species with limited existing data in the region. External morphological analysis of 20 specimens showed a mean total length of 124.4 ± 2.3 SE mm and an average body weight of 38.97 ± 2.54 SE g. Morphometric indices such as standard length, eye diameter, interorbital distance, body depth, head length, and mouth width exhibited minimal variation among individuals. Fin structure analysis indicated relatively stable ray counts: caudal fin (12 – 15 rays), pelvic fin (6 rays), dorsal fin (17 spines; 13 – 18 soft rays), anal fin (13 – 16 spines; 16 – 20 soft rays), and pectoral fin (11 – 13 rays). The allometric growth coefficient (b) calculated from the length-weight relationship was 3.25 (> 3), indicating positive allometric growth with a greater tendency toward weight gain. Digestive tract structure, a relative gut length (RGL) > 3, and gut content analysis (including Bacillariophyta, Chlorophyta, Euglenophyta, Cyanophyta, and zooplankton) confirmed that Helostoma temminckii is a filter-feeding species. The results of this study provide essential baseline data for taxonomy, artificial propagation, and future aquaculture development of this species in the study region.

Keywords: Diet composition, filter-feeding fish, feeding habit, Helostoma temminckii, morphology.

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