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Fish In - Fish Out (FIFO) Ratios explained

By Andrew Jackson

One of the long continued debates in aquaculture is the use of fishmeal and fish oil in feeds and the

amount of wild fish it takes to produce farmed fish. This debate has particularly raged around the use

of fish oil and fishmeal in salmon diets and a lot of different figures have been quoted for the number

of tonnes of wild fish it takes to produce a tonne of farmed salmon (FIFO ratio). These quoted figures

range from 3:1 to 10:1; the most recent figure published comes from Tacon & Metian (2008) who

gave the figure for Salmon in 2006 as 4.9:1, meaning it takes 4.9 tonnes of wild fish to produce 1

tonne of salmon.

It can be easily demonstrated how they came up with this figure. If we take 1 tonne (1000 kg) of wild

fish, they assume that this would yield 225 kg of fishmeal and 50 kg of fish oil.

In 2006 they say that on average salmon diets contained 30% fishmeal and 20% fish oil. This means

that one could produce 250kg of salmon feed by using up all of the 50 kg of fish oil. Salmon then

have a feed conversion ratio (FCR) of 1.25 which therefore gives a harvest volume of 200 kg of

salmon. So our starting 1000kg of wild fish have been turned into 200 kg of salmon which is a Fish in -

Fish out (FIFO) ratio of 5:1 (1000:200), which compares well with Tacon & Metian’s global figure of

4.9:1.

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Ja, det er litt interessant det der. Gikk et program på Brennpunkt for noen år siden.

Ble da trålet etter fisk utenfor Sør-Sahara. Denne fisken ble malt opp, og importert til Norge som annenrangs fiskeavfall. Da slapp nemlig importør å betale toll. Hvis dette ikke går inn i regnskapet som fisk i FIFO, så vil jo tallene se ganske pene ut mht hva som er ønskelig for oppdrettsnæringen.

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