Key figures
Calculate FCR, SGR and TGC yourself.
Three key figures show whether your feed and feeding are working. Enter your figures; the calculation runs in your browser and nothing is sent.
Feed conversion ratio (FCR)
FCR = kg feed ÷ kg weight gain
For the same period and the same tank. Subtract uneaten feed, include losses in the biomass. The achievable FCR on the product sheet applies under optimal conditions.
Specific growth rate (SGR)
SGR = (ln final weight − ln start weight) × 100 ÷ days
Shows the growth per day. To measure it, weigh a sample from each tank every 2–4 weeks.
Thermal growth coefficient (TGC)
TGC = (final weight^(1/3) − start weight^(1/3)) ÷ degree-days × 1000
Makes periods with different temperatures comparable.
Daily feed amount
Growth days as in the catalogue
Days = FCR ÷ feeding rate × ln(final ÷ start)
Go to the feed requirement calculator
Tip: weigh a sample every 2–4 weeks. The feeding rate is only right if you know the real biomass.