Search

Coral ornamental fish become potential fishery commodities, providing opportunities and challenges in managing fishery resources in Indonesia. This activity has long been done and has become one cause of damage to coral reefs in Indonesia. Changes in paradigm and technology currently applied in Indonesia are expected to provide a gradual regulatory and coral reef ecosystem improvement. The commercial trade of ornamental fish requires attention and rigorous regulation. The marine ornamental fish trade activity is expected to improve and drive the coastal communities' economy. The significant increase in exploitation is expected to be controlled with the right regulations. This regulation must refer to the concept of sustainable development established through the Sustainable Development Goals (SDGs), especially SDGs number 14 concerning life underwater. The existence of reef fish is enough to provide economic movement, which continues to heat up, especially after the pandemic and the reopening of flights and export activities abroad. However, multi-stakeholders should ratify the concept of sustainability and environment-friendliness. Support from the government, academia, industry, and community groups must be aligned and in tune to achieve sustainable development goals. Providing accurate information related to the biological characteristics of reef fish is an essential contribution for researchers that can be used directly by the community. Thus, the exploitation of reef fish can align with efforts to conserve coral reef ecosystems closely related to global warming and climate change. [ABSTRACT FROM AUTHOR]

Lake Batur is one of the priority lakes for the government initiative to control the damage, and to restore the condition and function of the critical lakes. The degradation in biodiversity due to the invasive and non-native species could raise ecological, economic, and socio-cultural problems for the community. In Lake Batur, there are several fish introduction activities since 1935. Many introduced fish species have turned invasive and could alter the structure of fish communities. It is important to have a solid understanding of how invasive species affect an ecosystem and its biodiversity. Despite numerous studies on fish diversity in Lake Batur, the accurate information on fish diversity and the presence of non-native species in Lake Batur is still not completely known. This paper aims to investigate the diversity of fish in Lake Batur to provide accurate information about the composition of fish species and the presence of existing non-native and invasive fish in Lake Batur. We collected fish samples during the dry season from 30 August-5 September 2022. We used experimental gillnets (30 × 2 m, with mesh size of 16 mm; 25 mm; 37.5 mm; 50 mm; 62.5 mm; and 75 mm), fish nets from the fishing communities (mesh size of 50-75 mm), fishing rods, and scoops. Direct identifications were conducted for the fish samples in the location. For unidentified fish, we preserved the fish sample for further identification. A total of 1104 fish samples from lakes and floating net cages with five different stations were collected. In contrast to the others station, station 4 Abangsongan has all fish species. We obtained 17 species distributed among 8 families. Cichlidae is the most dominant fish family, including the non-native species Nile tilapia (Oreochromis niloticus) and Midas cichlids (Amphilophus citrinellus). Furthermore, Midas cichlid has become invasive with a very rapid increase during the last 10 years in Lake Batur. For Poecilidae family, Bonylip barb (Cyclocheilichthys apogon) is clearly identified for the first time in this study. This study concludes that the invasive species, or non-native Indonesian species represented by Cichlidae species, are a significant issue for fish diversity in Lake Batur. [ABSTRACT FROM AUTHOR]