(CNN) -- True or False: Salmon farms drain our protein supplies as it takes 3-4kg of wild fish feed to produce 1kg of salmon.
The answer is: FALSE
This is an interesting one as it does indeed take between 3 to 4 kilos of wild fish to produce enough feed to produce 1 kilo of farmed salmon.
The problem, says Greenpeace founder Patrick Moore and others is that it's not humans that are missing out, as the fish feed that is given to salmon is either not intended for human consumption or is not fit for human consumption.
According to The Society for the Positive Awareness of Aquaculture (SPAA), quoting Patrick Moore, one third of the world's fishmeal is consumed by fish fams - "the majority is fed to chicken and pigs".
According to the U.S. National Oceanic and Atmospheric Administration, quoting 2002 figures, 81 percent of the fish oil produced globally and 46 percent of fishmeal is used for feed on fish farms. There is, however, some understandable cause for concern as global fish stocks are depleting, yet 30 percent of all fish caught go towards feeding animals.
However, according to the UN's Food and Agricultural Organisation (FAO) 90 percent of the fish that makes fishmeal or oil, is "presently unmarketable in large quanities as human food".
The reasons for this include the facts that some of the species that make up fishmeal are either unknown or "unpalatable"; the fish in question are "too small or break down or turn rancid too quickly for economic storage" and subsequent processing.
The FAO says this on the matter: "Turning high quality fish into fish meal and oil should not be encouraged. It is obviously more efficient, however, in a protein-hungry world to harvest the unacceptable species for feeding to animals, subsequently consumed by man, than to leave them unharvested in the sea." E-mail to a friend
(Sources: Greenpeace; The Society for the Positive Awareness of Aquaculture; U.S. National Oceanic and Atmospheric Administration; United Nations Food and Agricultural Organisation)