Toxicity test of LC-50 (Lethal Concentration) surfactant LAS (Linear Alkylbenzene Sulfonate) against white snapper (Lates calcarifer) fingerlings on a laboratory scale

LAS (Linear Alkylbenzene Sulfonate) surfactants are the main cleaning agents from anionic group found in detergents that widely used Indonesia. decomposes surface water for 1-2 days, sediments it 1-3 marine and estuarine systems 5-10 days. is generally degraded by as much 90% within 3 months, with a time ranging 5-30 days (World Health Organization, 1996). can cause damage to gill epithelium blockage of branchiola channels fish. This study aims determine toxic effect surfactant on survival white snapper (Lates calcarifer) fry toxicity value LC50 (Lethal Concentration) laboratory scale. research was carried out September 21 – October 04, 2021 at Marine Science Laboratory, Faculty Agriculture, Malikussaleh University using experimental methods 5 treatments, namely: control treatment A (0 ppm), B (0.83 C (1.58 ppm). ), D (2.16 E (2.91 The results this barramundi experience irregular movements, mouth opening operculum tend be fast irregular, scales pale peeling, death, affect quality such pH dissolved oxygen, but have no salinity temperature. 24-hour 1.95 ppm, 48-hour 1.86 72-hour 1.70 96-hour 1.58 ppm.Key words : surfactant; LC50; toxicity;