The extracts of three marine organisms; the ascidian Ciona intestinalis, the brown seaweed Sargassum muticum and the sponge Halichondria panicea, all elicited a number of brominated compounds, some of which were tentatively identified. Tribromophenol was observed in all species. This compound, also industrially produced as flame retardant and fungicide, was likely due to endogenous production.
Kotterman, M. J. J., van der Veen, I., van Hesselingen, J. M., Leonards, P. E. G., Osinga, R., & de Boer, J. (2003). Preliminary study on the occurrence of brominated organic compounds in Dutch marine organisms. Biomolecular Engineering, 20(4-6), 425-427. https://doi.org/10.1016/S1389-0344(03)00072-8