Brine Shrimp Lethality Test of Methanolic Extracts from Four Different Marine Biota in Lampung Province, Indonesia

This study aims to test the LC50 toxicity activity of brine shrimp using four samples of marine biota. The LC50 toxicity activity has the potential as an anti-bacterial, anti-fungal, and anti-cancer agent that needs to be studied further before being used as an industrial-scale natural product, this study is basic research on the brine shrimp lethality test. The test was carried out using the Brine Shrimp Lethality Test (BSLT), which analyzes the number of deaths of shrimp larvae to determine the level of toxicity of an ingredient. The marine biota samples used were Rhizopora sp., Sargassum sp., Halimeda sp., Diadema setosum. The manufacturing stage begins with making extracts and hatching artemia, then toxicity tests are carried out within 24 hours with different concentrations of sample solutions. The results of this research show that the sample extracts that have the highest to lowest toxicity values respectively are Rhizopora sp., Sargassum sp., Halimeda sp., Diadema setosum. with a value of 870.96 µg/mL; 745.05 µg/mL; 697.97 µg/mL; 575.4 µg/mL

Relationship Between Characteristics of Marine Debris and Impact to Coral Reef

HighlightMarine debris can be as a treat for coral reefBranching coral is the most affected by marine debrisPlastic marine debris commonly found in all research location, especially from fisheries and daily activityAbstractA coral reef is one of the important ecosystems, however, the existence of coral reef is threatened. Several factors can be a threat to the coral reef, such as marine debris. Research about marine debris on coral reefs in Indonesia has not much been done. This research aims to identify marine debris that is found and impacted, to identify the impacts caused, and to identify the life forms most susceptible to being affected. This research was conducted in Kelapa Island, Kelapa Dua Island, and Harapan Island by using the Belt Transect method sized 20 x 4 m2 with four repetitions at each station to determine coral reef life form, and type of marine debris. The data was analyzed by using the Correspondence Analysis (CA) to determine the correlation of marine debris and the affected life forms of coral reefs. The result showed the plastic marine debris was found in all stations. Six life forms were affected by marine debris, and the most susceptible life forms that affected were massive and branching. The most dominant impact category on coral reefs was tissue loss with algal growth (TLAG)