interreg 
Baltic Sea Region 
JROPEAN 
36I0MAL 
5VELOPMENT 
aD. 
7” COMPLETE PLUS 
Appendix 2: Background information to the flow chart. 
Trading area 
Voyage history since the last cleaning. 
Same port and surrounding 
International 
* Preconditions for IWC 
Cleaning 
Technique/ Method 
Niches 
According to manufacturer’s specifications. 
All niches have to be accessible and eleanable 
Level of Fouling 
1) Biosecurity risk (BSR) 
Growth and accumulation of aquatic organisms (biofouling) on vessels affects their 
performance and can lead to a spread of organisms removed from the hull. If the organisms 
survive, alien species can spread and present a threat to native species which finally 
endangers biodiversity. When they do not have natural enemies, they can reproduce 
unimpeded and ultimately disturb the established ecosystems (BIMCO 2021. 47). 
(based on Floerl et al. 2005, 765—778) 
Level of Fouling 
"ow 
Medium 
Description 
» No visible fouling. Hull entirely clean, no 
Diofilm on the previously submerged parts 
of the hull. 
» Slime fouling only. Previously 
submerged hull areas partially or entirely 
covered in biofilm, but absence of any 
macrofouling. 
» Light fouling. Hull covered in biofilm and 
1-2 very small patches of macrofouling 
(only few taxa present). 
» Considerable fouling. Presence of 
biofilm, and macrofouling still patchy but 
clearly visible and comprised of either 
one single or several different taxa. + 
Extensive fouling. Presence of biofilm and 
abundant fouling assemblages consisting 
of more than one taxon. 
Visual estimate of fouling 
cover 
Nil 
+ 1-5 % of surfaces that 
have been submerged. 
6-15 % of surfaces that 
have been submerged. 
* 16—40 % of surfaces that 
have been submerged 
12