Environmental Engineering Reference
In-Depth Information
Table 14.1
(Con't.)
Application issues
Benefi ts
Limitations
Requires good
underwater visibility
May require repeated
treatments
Limited to a small area
Labour intensive
Selective (low collateral
impact)
Does not require complex
equipment
Not all targeted species may
be collected
Diver safety issues
All target individuals must
be collected
Unsuited to cryptic species
Diffi cult to treat niche
areas
Quick (i.e. 30m vessel
in 4 hours)
Can be done
in situ
Discharge of all fouling
material directly into the
environment
Removes adults and/or
stimulates the release of
propagules or fragments
into the water column
Diver safety issues
Specialized brushes,
pumps, and collection
bags required
Not all fouling may
be removed/collected
Brushes may not be
able to access 'nook
and crannies' on a hull
Quick (i.e. 30m vessel
in 4 hours)
Can be done
in situ
Fouling material collected
on the surface (90%)
Discharge of fi ne particulate
to the environment
May remove adults or
stimulate the release of
propagules or fragments
into the water column
Diver safety issues
Simple to apply
Applied above-water
Effectiveness depends
on water pressure
Can be applied quickly and
cheaply (i.e. standard
off-the-shelf technology)
May fragment/redistribute
species
May be expensive
Time consuming
Specialized equipment
required
Labour intensive
Only practical over
small areas
Not all fouling may
be removed/collected
Can target specifi c areas
May fragment/redistribute
species
Can miss species
Diver safety issues
