Abstract
Abstract Antifouling coatings based on organotin compounds possess a world-wide threat to the environment and due to growing restrictions there is a need for environmentally safe antifouling systems. TNO is working on the development of novel antifouling systems based on secondary metabolites from sponges. Screening for natural antifoulants is conducted using a settlement assay with cyprid larvae of the barnacle Balanus amphitrite Darwin. Forty-four sponges (35 species) were collected from around the island of Curacao in the Caribbean and settlement assays were performed with the ethyl-acetate extracts. Thirty-one extracts significantly inhibited cyprid settlement at 0.1 mg ml−1, of which 22 significantly inhibited settlement at 0·01 mg ml−1.
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