Maturity stages of the redbreasted wrasse Cheilinus fasciatus

Abstract

The redbreasted wrasse Cheilinus fasciatus is an ornamental fish exploited for the marine aquarium trade. Even though it has white flesh, the redbreasted wrasse is not popular as a food fish because the flesh is quite thin. The redbreasted wrasse is widely distributed in the Indian and Pacific Oceans. It lives in tropical waters at depths of 4 to 60 m and at temperatures of 23 to 27°C. The objective of this study was to describe the gonad maturity stages of this fish using macroscopic characteristics. Sampling was carried out at Makassar Fishing Port from January 2018 to May 2019. The parameters observed in both male and female specimens were gonad length, width, weight, and gonad colour. Each specimen was also weighed and measured. Five gonad maturity stages were identified and described: Stage I (Immature or transition), Stage II (Early maturation), Stage III (maturation), stage IV (mature) and Stage V (post spawning or spent). These stages were described based on macroscopic structure and morphometric parameters of the gonads. The five stages coincided with changes in the Gonadosomatic Index (GSI), indicating that the five stages were valid. These stages could be used as a practical reference for identifying gonad maturity and describing the reproductive cycle of the redbreasted wrasse C. fasciatus.

Change in Reef Fish Assemblages along Depth Gradient at Gili Rakit and Gili Lipan Marine Protected Areas (MPAs)

“…Ecological shifting occurred the most on the Indonesian coral reefs through natural phenomena and massive/yearly anthropogenic pressure [39,40]. Gili Rakit and Gili Lipan MPAs are one of the MPAs affected yearly by destructive fishing before it was established.…”

Diversity of non-targeted species on blue swimming crab Portunus pelagicus gillnet fishery in Grogol, Cirebon

“…The highest Shannon-Wiener diversity index value was found in December (2.16), and the lowest was in September (1.15), with a seven-month average of 1.57. This value indicates that the ecological status of non-targeted species in the waters of Grogol Village is classified as moderate, which according to [11] can be interpreted as where the conditions are high productivity, fairly balanced ecosystem conditions, and moderate ecological pressure. The Shannon-Wiener (H) diversity index is generally used to describe species diversity in a community and accounts for both the abundance and evenness of species present in an area.…”

“…The value of the Simpson dominance index is included in the low to moderate category, which indicates that the level of dominance is quite low. [11] stated that a low dominance index value indicates that there are no species that strongly dominate the catch. Similar results were found in [9] study in Lasongko Bay, Southeast Sulawesi, where the dominance index value was 0.242-0.534, which was in the low to moderate status category.…”