Page 15 - FULL YEAR BOOK 2021

Editorial

stallation and low maintenance and can
be retrofitted to existing tank systems or
built from the ground up.
RAS are ideal for sensitive stages in
aquaculture production. Broodstock facili-
ties can significantly benefit from RAS as
controlled environments are essential for
broodstock, especially when out-of-sea-
son groups are being held. Removing risk
of pathogen infection in broodstock facili-
ties, which are the most important part of
any aquaculture project, can enhance the
economic security of a project. RAS are
also ideal for hatchery and nursery stag-
es where the larvae are very sensitive to
pathogens and need stable conditions.
Moreover, culturing non-endemic spe-
cies requires tight control on effluent
and, in many cases, the use of RAS is one
of the culture permit’s requirements.
However, as aforementioned, RAS tech- C12
nology is relatively new. Whilst there are
successful projects which grow fish and
®
have a good return on investment, there Optimize body defence with FRA C12
are many other projects that are either
not reaching their designed capacity or
are simply not profitable due to higher Growth
production costs, low ROI etc. performance
RAS Components Immune
response
Recirculating water process has Decreased
several steps and components: FCR
1. Removing solids such as feed left-
over and feces from the water which Read why glycerides in
®
is achieved via mechanical filtration. FRA C12 are proven to
be successful in replacing
There are different solutions for solid re- the preventive use of
moval including drum filters, parabolic antibiotics in broilers.
screens, swirl separator and others.
www.Framelco.com
2. Removing and transforming harm-
ful soluble nutrients such as ammonia
and nitrite through a biological process.
This process is called ‘biofiltration’ and
it is carried out by using specific bac-
teria that transfer harmful ammonia to
nitrite (nitrosomonas bacteria) and then
to nitrate (nitrobacter bacteria) which
is harmless metabolite. The process GLYCERIDE SUPPORT
requires a large number of bacteria,
hence, there are specifically made appa-
ratus which have large surface to volume
ratios (‘bio-balls’) which creates a sur-
face area for the bacteria. Water passes
through the bio-balls and the bacteria
‘strip’ the ammonia from it.

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