TABLE OF CONTENTS Pages Symposium 1 - the National Sea ...

sedimentation, bio-reactor) and (2) and an configuration incorporating a denitrification
unit, (3 fish tanks, drumfilter (60μm), bio-reactor, denitrification reactor (an Upflow
Sludge Blanket reactor). Both systems were identical in biomass stocking and daily feed
load. pH, Conductivity, O2, NH4-N, NO2-N, NO3-N, COD, Dry Matter, Ash, Kjeldahl-N,
NaHCO3, water discharge (volume and composition) and nutrient retention in fish were
measured to produce mass balance criteria for system comparison.
The fish culture module of the ANIPRO model developed for the EU fish project Blue
label was used to simulate the heat balance of both 100 tons system configurations. The
model allows to design energy efficient and cost effective heating and cooling systems
for fish farms in different geographical regions. The calculated heat production in the
model is based on 1) conversion of feed (heat production from standing stock and water
treatment) 2) pumps, 3) lighting (including UV for disinfecting); heat transmission into
the building (especially solar radiation). Heat is lost from the system by : 1) ventilation
air (sensible and latent heat); transmission of heat through floor, walls and roof; 3)
makeup water. The indoor and basin temperatures iterate until there is a balance between
heat production and heat loss (Aarnink et al. 2000). The parameters in the model have
been obtained from Dutch catfish farmers and were calibrated with on farm
measurements for the culture of African catfish.
The number of I.E. per farm is calculated by: Q/136*(COD+4.57 Kjeldahl nitrogen)
(Q=waste waterflow).
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