Janusz Zaucha and MAŁGORZATa Matulaniec
Sea Fisheries Institute, Kołłątaja 1, 81-332 Gdynia, Poland

Key words: fishing nets, anti-overgrowth substances, biocides, marine environment, non-toxicity.

Abstract.
This work presents investigations of the anti-overgrowth properties of biocides applied to net finishing. The following two biocides are presented: Busan and the isothiazolon derivative Sea-Nine and Fungicide ABS-1. Both biocides decomposedrelatively easily into nontoxic compounds in the water environment. The biocides were introduced in various concentrations to two different net finishing compounds, cable coating A and FM emulsion. The effectiveness of retarding the processes of overgrowth was comparable to those obtained by using TBTO, which is toxic to the environment and banned in western countries. The effectiveness of Busan was evaluated negatively since it protected the net from overgrowth for a very short time. However, the Sea-Nine and Fungicide ABS-1 biocides were evaluated positively since the period of net protection was longer, although still two times shorter than in the case of TBTO.