If nutrients are available, a sensible animal will hoard them.

ECONOMIST: Obesity

According to Pratt, a superfood has three qualifications: It has to be readily available to the public, it has to contain nutrients that are known to enhance longevity, and its health benefits have to be backed by peer-reviewed, scientific studies.

CNN: Eat more 'superfoods' to lose weight

"Lots of organisms, particularly tiny bacteria, eat and take nutrients from detritus and in doing so they make it available to the higher organisms who eat them, " said Mackinson.

BBC: The model should aid future management of the North Sea