Growth pattern, condition factor and reproductive aspects of three spot gourami Trichopodus trichopterus (Pallas, 1770) in mangrove waters of Muara Angke Jakarta and Ciperet Cilacap, Indonesia

Abstract

Mangrove ecosystem is a unique and interesting ecosystem which inhabited by many fish species such as three spot gourami (Trichopodus trichopterus). This study aimed to determine length-weight relationship (LWR), growth pattern, condition factor, sex ratio and gonad maturity stage of three spot gourami from mangrove waters of Muara Angke Jakarta and the Ciperet Cilacap, Indonesia. Fish samples were collected by cast net and gill net at four research stations in Muara Angke and Ciperet Cilacap from January to March 2014 and September to October 2012, respectively. The total length and total wet weight were measured, subsequently, the sex and stage of gonad maturity were morphologically determined. The LWRs of three spot gourami in Muara Angke were W = 6E-05L2893 for male and W = 0,0003L2619 for female, whereas, the LWRs of male and female in Ciperet estuary were W = 0,0007L2371 and W = 0,0006L2444, respectively. Moreover, the growth pattern of the male one in Muara Angke was isometry, while the female was negative allometry. In Ciperet estuary, the growth patterns for male and female were negative allometric. The Fulton’s condition factors for males and females in the Muara Angke were ranged from 3.7118±0.7847 and 1.0014±0.0551, respectively. Whereas, in the Ciperet estuary, the condition factor values were ranged from 1.0011 ± 0.0485 and 1.0024 ± 0.0685 for males and females, respectively. The sex ratio for males and females on the Chi-square test with a confidence interval of 95% (α = 0.05) was significantly different by 1:1.93 in Muara Angke and 1:1.69 in Ciperet estuary. In both areas, various maturity stages of gonad were found, with different dominant maturity stage. In Muara Angke, most of the fish were at higher gonadal maturity stages (III and IV), whereas in Ciperet estuary the lower gonadal maturity stages (I and II) was found.