# Fish In - Fish Out (FIFO) Ratios explained

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1 Fish In - Fish Out () 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 ( 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 () ratio of 5:1 (1000:200), which compares well with Tacon & Metian s global figure of 4.9:1. SALMON How much salmon do I produce? Fish oil in the diet 20 Fishmeal in the diet 30 Requirement of oil kg 50 Requirement of fishmeal kg 75 Amount of feed that can be produced kg 250 FCR 1.25 Salmon Produced kg Fishmeal left over kg 150 Assumptions from Tacon & Metian highlighted However, it can be seen from the table that while all the fish oil was used to produce the salmon feed, there was 150kg of fishmeal left over; this cannot be used as there is no more oil. In their calculation this is just thrown away and wasted.

2 Let us now turn our attention to the production of shrimp, the other major global user of fishmeal; in this case Tacon & Metian give a ratio of 1.4:1. Again we can do a worked example using the same starting point of 1 tonne of wild fish. SHRIMP How much shrimp do I produce? Fish oil in the diet 2 Fishmeal in the diet 20 Requirement of oil kg 22.5 Requirement of fishmeal kg 225 Amount of feed that can be produced kg 1125 FCR 1.7 Shrimp Produced kg Fish Oil left over kg 28 In this case the diets from shrimp require much more fishmeal than fish oil, so all the 225kg of fishmeal is used to produce 1125 kg of shrimp feed, which with an FCR of 1.7, produces 662kg of harvestable shrimp and a ratio of 1.5:1 (1000/662). This is virtually the same as the Tacon & Metian figure of 1.4:1. On this occasion it can be seen that there is 28kg of surplus fish oil which it is assumed is discarded. It can therefore be clearly seen that with salmon production there is surplus fishmeal and with shrimp production there is surplus fish oil, so that a combination of the two should be more efficient. SALMON PLUS SHRIMP How much salmon do I produce? How much shrimp do I produce? Fish oil in the diet 20 Fish oil in the diet 2 Fishmeal in the diet 30 Fishmeal in the diet 20 Requirement of oil kg 35 Requirement of oil kg 15 Requirement of fishmeal kg 53 Requirement of fishmeal kg 150 Amount of feed that can be produced kg 175 Amount of feed that can be produced kg 750 FCR 1.25 FCR 1.7 Salmon Produced kg 140 Shrimp Produced kg 441 Total Weight Produced Fishmeal left over kg 23 Fish Oil left over kg 0 In this case if we use most of the oil (35kg from the available 50kg) for the salmon, we can produce 175 kg of salmon feed and this produces 140 kg of salmon. This would also use 53 kg of the available 225kg of fishmeal. If we use the remaining 15 kg of fish oil for shrimp feed and combine this with 150

3 kg of fishmeal we could produce 750kg of shrimp feed, which would yield 441kg of shrimp. The combined ratio is now 1.7:1 (1000:581) and there is still 23kg of fishmeal left over. So let us go one more step and combine our salmon and shrimp production with some carp production, which does not use any fish oil. SALMON PLUS SHRIMP PLUS CARP How much salmon do I produce? How much shrimp do I produce? How much carp do I produce? Fish oil in the diet 20 Fish oil in the diet 2 Fish oil in the diet 0 Fishmeal in the diet 30 Fishmeal in the diet 20 Fishmeal in the diet 5 Requirement of oil kg 35 Requirement of oil kg 15 Requirement of oil kg 0 Requirement of fishmeal kg 53 Requirement of fishmeal kg 150 Requirement of fishmeal kg 23 Amount of feed that can be produced kg 175 Amount of feed that can be produced kg 750 Amount of feed that can be produced kg 450 FCR 1.25 FCR 1.7 FCR 1.8 Salmon Produced kg 140 Shrimp Produced kg 441 Carp Produced kg 250 Total Weight Produced Fishmeal left over kg 0 Fish Oil left over kg 0 Now we can see that if we use the extra 23kg of fishmeal, we could produce 250kg of carp and reduce further the ratio to 1.2:1 and now everything is being used and there is no wastage. From these worked examples it can be seen that calculating the ratio based on just one type of farming does not give the correct picture and that the reality is that one should only use in the ratio calculation what is actually used and not discard anything. In the real world all the fishmeal and fish oil is used and therefore we need a method of calculation that correctly attributes the wild fish caught to their final use. Let us therefore use the following formula : Ratio = Level of fishmeal in the diet + Level of fish oil in the diet X FCR Yield of fishmeal fish + Yield of fish oil fish So for Salmon we calculate: Salmon Ratio = X 1.25 = To check whether this is giving us the correct answer we can use it to recalculate how much wild fish was used in our worked example to produce our 140, 441 and 250 kg of salmon, shrimp and carp:

4 Salmon Shrimp Carp calculated using formula Total of farmed production kg Amount of wild fish used kg (Production x ) Total amount of wild fish used kg 1000 We can therefore see that the total requirement of wild fish to produce these different amounts of salmon, shrimp and carp was 1000kg, our agreed start number. We can therefore assume that this method of calculating the ratio correctly attributes volumes of wild caught fish to their correct final use. Let us therefore turn from just one tonne of wild caught fish to the 20.2 million tonnes of raw material that was used for the production of fishmeal and fish oil in 2006 according to the FAO (FAO SOFIA 2008). Tacon & Metian in their recent paper gave the results of their global survey of aquaculture feeds and reported the following : Data presented by Tacon & Metian with Wild Fish Used calculated using their method Species Volumes Fish Production Feed Used World FCR FM Used FO Used Ratio Wild Fish Used Salmon Trout Eel Marine Fish Shrimp FW Crustaceans Tilapia Catfish Milkfish Carp Misc FW Carn. Fish Total Fed farmed fish & shellfish We can see all the groupings of aquaculture species that make use of fishmeal and fish oil and their calculated Ratios including those for salmon and shrimp as already discussed. However, in the final column one can see the tonnage of wild fish required in the production of each group and this agrees with their reported ratios. We can see that, as in our small scale example, the method produces very high levels of wild fish usage to the point where if we add them up we reach a total global figure of nearly 23 million tonnes of wild fish. This is in excess of the FAO figure for total world catch of wild fish rendered for fishmeal and oil production (20.2 million) and the calculation does not consider fishmeal and fish oil used in pig and poultry production. If however we use the same data as presented by Tacon & Metian but use the alternative method of calculating the ratio, as outlined earlier, we obtain the following:

5 Alternative Method for Calculating Ratios Species FM in Diet FO in Diet Yield of FM fish Yield of FO fish Ratio Wild Fish used,000 t Salmon Trout Eel Marine Fish Shrimp FW Crustaceans Tilapia Catfish Milkfish Carp Misc FW Carn. Fish Total of Fed farmed fish & shellfish Now with this new method we have a different set of ratios, with salmon still the highest at 2.3:1, but now the total amount of wild fish used in aquaculture production is 16.6 million. The remainder is used in pig and poultry production. So if we follow the same system to try and get an idea of the global picture using FAO STAT data for pig and poultry production we can estimate the following: Table showing the calculated for Aquaculture, Pigs and Poultry FM in Diet F0 in Diet Yield of FM Yield of FO FCR. FIPO World Production Use of Wild Fish Aquaculture Pigs Poultry Total Pigs and poultry make very little use of fish oil and fishmeal is used mostly in the early stages but has been largely removed from most adult grower diets. So the inclusion figure in the above table is very low over the whole growing cycle. This gives us a total raw material use for fishmeal and fish oil production of 23.3 million tonnes for these three major categories. We therefore feel that this method of calculating the Fish in - Fish out ratios for aquaculture gives a truer representation of situation than previously used methods. But, as already mentioned, the FAO estimated 20.2 million tonnes of wild fish being rendered down for fishmeal and fish oil in One reason for this is that the assumed yield figure of fishmeal from whole fish used by Tacon and Metian was Over the last decade improved processing equipment has ensured a greater protein recovery from the whole fish and the latest data IFFO has on this is that yield figures for the industry range from So if instead of 22.5, we use a fishmeal yield figure of 24 we get the following:

6 Summary of Ratios as calculated by IFFO Species FM in Diet FO in Diet Yield of FM fish Yield of FO fish Ratio Wild Fish used,000 t Salmon Trout Eel Marine Fish Shrimp FW Crustaceans Tilapia Catfish Milkfish Carp Misc FW Carn. Fish Total of Fed farmed fish & shellfish Pigs Poultry Total This reduces the total weight of wild fish used to 22.1 million tonnes (down from 23.3 million) which is closer to the FAO figure of The annual global production of fishmeal in 2006 according to IFFO statistics was 5.2 million tonnes which at a 24 yield would require 21.7 million tonnes of raw material. The figures are therefore all consistent. One final consideration is that more and more of the world s fishmeal and oil is derived from fisheries by-products such as heads, guts and filleting waste. The differentiation between by-product fishmeal and whole fish fishmeal has not been well captured in world statistics; this goes for both IFFO and FAO data. In a recent study conducted by IFFO we calculated that around 22 of fishmeal was derived from by-products rather than whole fish. If we use this assumption the whole wild fish in - whole farmed fish out ratio obviously falls: Table showing the calculated for Aquaculture, Pigs and Poultry excluding fisheries by-products World Production Use of Fish Coming Use of whole from fishery byproducts wild fish,000 t /FIPO Aquaculture Pigs Poultry Total Salmon In this case the Fish in - Fish out ratio for all aquaculture falls to That is for every tonne of whole wild fish caught, aquaculture produces 1.92 tonnes of harvestable product. Salmon is still the highest user with a ratio of 1.68, meaning that for every tonne of whole wild fish used there is tonnes of salmon produced. If one looks at the whole of the fishmeal and fish oil industry, for every 1 tonne of whole wild fish converted into fishmeal and fish oil, the food producing industries which use these products produce around 14 tonnes of farmed produce.

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