Abstract
Marosatherina ladigesi is an endemic fish species in South Sulawesi and is famous as ornamental fish. However, the biological information of this species is still restricted. This research direct analyzes the length-weight relationships and condition factors of M. ladigesi. Sampling was held monthly from May 2018 to April 2019 in the Walanae Cenranae River Watershed, South Sulawesi. Fish samples were assembled by seine net. A total of 550 M. ladigesi were collected consisted of 227 fish in Camba River, 88 fish in Sanrego River, and 235 fish in Batu Puteh River. The length-weight relationship of male and female fish was W = 0,0002L2,74 and W = 0,00004L3,23 in Camba River, W = 0,0001L2,78 and W = 0,0001L2,92 in Sanrego River, W = 0,0001L2,88 and W = 0,00006L3,12 in Batu Puteh River, respectively. In Camba and Batu Puteh Rivers, the growth pattern of male and female fish were negative allometric and positive allometric, respectively. Conversely, the growth patterns of male and female fish in the Sanrego River were isometric. The condition factor fish in Sanrego River was lower than Camba and Batu Puteh River. These findings are valuable data for establishing a monitoring and conservation of this endemic species in its habitat.
Highlights
That one of the biodiversity hotspots is Sulawesi Island, which resides between the Sunda and Sahul shelves well known in the Wallacea region
The average condition factor for male and female M. ladigesi from May 2018 to April 2019 in Camba, Sanrego, and Batu Puteh Rivers is shown in Figure 3 that female fish have a higher condition factor value than male fish
This study found that the condition factor for female fish was greater than male fish
Summary
That one of the biodiversity hotspots is Sulawesi Island, which resides between the Sunda and Sahul shelves well known in the Wallacea region This can be referred from several endemic fishes in Sulawesi's freshwater environment. Different things can be seen from the species in the Sulawesi rivers, which are currently less desirable with a limited number of studies. Anthropogenic activities, including destructive fishing and habitat degradation caused by the dredging of sand, have continued to threaten the ecological functions of these wetlands [10, 11]. It carried M. ladigesi to the red list of threatened IUCN, the category of vulnerable species. The result of this study will be helpful for Celebes rainbow fish conservation
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