Sexual dimorphism, length-weight relationship, and condition factor of Hampala ampalong (Bleeker, 1852) from Kalong Floodplain, Ogan Komering Ilir Regency

Abstract

Sumatra hampala or kebarau fish, Hampala ampalong (Bleeker, 1852) is one of the fish species found in Kalong Floodplain in the Ogan Komering Ilir Regency, South Sumatra, Indonesia. This study aimed to determine sexual dimorphism, length-weight relationship and condition factor of H. ampalong. The study method used was direct observation with purposive sampling technique. The total fish obtained consisted of 12 male and 12 female. The results showed that almost all morphometric characters of female were longer than male except for head length which determined that male longer than female. The head length of male was 2.28 ± 1.04 while the head length of female was 2.27 ± 0.85 it could be assumed that the sexual dimorphism seen from the difference in head length. While the meristic characteristics there was no difference between male and female; dorsal fin spine and rays (I. 7-8), ventral fin rays (6-8), pectoral fin rays (13), anal fin rays (6-9) and caudal fin rays (18). The length-weight relationship of male obtained a linear regression equation y = 0.0092x3.0418 with R2 = 89.45%, the value of b obtained was 3.0418 which means that the growth pattern of male was isometric (b=3), while the linear model regression equation of female fish y = 0.0238x2.6975 with R2 = 76.74%, the value of b obtained was 2.6975 which indicates that the growth pattern of female includes negative allometric (b<3). The value of the relative condition factor of male and female were K>1 which means the value of fish condition were in good.