This study explores the sustainable production of mosambi peel liquid (MPL) through fermentation, emphasizing its larvicidal and growth-promoting potential. Physico-chemical characterization revealed its acidic nature, with quantification of acetic, citric, and tartaric acids. A larvicidal assay using MPL at 0.5%, 1%, 1.5%, and 2% concentrations against third instar larvae of Culex quinquefasciatus showed significant mortality, with an LC50 of 0.6% (p < 0.05), indicating strong efficacy. Growth studies on Vigna radiata seedlings and Labeorohita fingerlings exposed to varying MPL concentrations demonstrated enhanced shoot and root length in plants and length and weight gain in fish, exclusively at 1%. These results highlight MPL's dual role as an effective bio-larvicide and bio-stimulant. Its application offers a sustainable alternative to chemical larvicides, fertilizers, and fish feed, reducing environmental impact while supporting agricultural and aquacultural productivity.
