LENGTH-WEIGHT RELATIONSHIP, SEXUAL DIMORPHISM, AND CONDITION FACTOR OF FRESHWATER SLEEPER Sineleotris namxamensis (ODONTOBUTIDAE) IN NORTHERN VIETNAM

DOI: 10.18173/2354-1059.2023-0066

Tóm tắt

Sineleotris namxamensis Chen & Kottelat, 2004 is a species of the family Odontobutidae distributed in freshwater streams. The information on morphological characteristics, sexual dimorphism, length-weight relationships, and condition factors for this freshwater sleeper have been described based on samples collected in Northern Vietnam. The specimens were identified at the species level based on morphometrics combined with the fin, scale counts, and the head lateral line system. To distinguish between both sexes in this species, five morphometric characteristics such as snout to 2nd dorsal fin origin, snout to anus, eye diameter, pelvic-fin length, and pelvic fin origin to anus have been used. The b was higher than the isometric value of 3 indicating in both sexes (3.457 for females, 3.439 for males, and 3.443 for all), and this species revealed a positive allometric growth through the length-weight relationships, which was found to be highly significant. For the first time, the obtained K values and the LWR for this species revealed no significant variation between males and females. The fish community where this goby lives shows that there was little evidence of species competition, allowing it to grow well. These findings provide essential information for resource exploitation and conservation of this species in nature.