Hermaphroditism and gonadal maturity of the Rivulated Parrotfish Scarus rivulatus (Valenciennes, 1840) in the waters of Panggang Island, Seribu Islands, Indonesia A Yanti(a), Sulistiono(b*), A Mashar(b)
a) Study Program of Aquatic Resources Management, Graduate Program, Bogor Agricultural University, Bogor, 16680, Indonesia.
b) Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, IPB University (Bogor Agriculture University), Jl Agatis Dramaga Bogor, Bogor 16680, Indonesia.
*onosulistiono[at]gmail.com
Abstract
Rivulated parrotfish Scarus rivulatus is a prevalent target fish on Panggang Island. The study aims to examine the hermaphroditism and gonadal maturity of the parrotfish. Samplings were done from January to March 2022 from fishers catches that landed on Panggang Island. Parameters measured were total length, total weight, gonad weight, sex, and gonadal maturity. The number of samples was 525 fish, consisting of 221 females and 304 males. The length of the fish ranged from 9.0 to 20.2 cm (female), 10.5 to 21.3 cm (transition from female to male), and 10.5 to 26.4 cm (male). The study indicated that the sex ratio was not balanced where there were more males than females (1.38:1). The development of the gonad maturity stages was synchronous between females and males from January to March. During the study, maturing and mature gonads were very dominant, indicating that these months were the time for the fish to spawn. The size of the first gonadal maturity reached 13.1 cm (female), 15.7 cm (transition from female to male), and 18.4 cm (male). This size at first gonadal maturity indicates that the Rivulated parrotfish Scarus rivulatus was a protagonist hermaphrodite
Keywords: Synchronous, sex ratio, first gonadal maturity, fishers catches
