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In a recent video where we talked about bluefin tuna fishing and how it’s regulated, one theory emerged from the many comments we received on both the YouTube and Instagram versions: the anchovy population in the Mediterranean is in crisis and declining because there are too many tuna. True or false?
In the Mediterranean Sea, there has been a decline in both the population and the size of anchovies; this is objectively true. According to marine biologists, the hypothesis that tuna are the primary cause of the decline in anchovies is unfounded.
The true causes of the decline in anchovy stocks are both environmental and human-induced. In this video, we’ll analyze the main—and most well-established—causes of this process, over which tuna has virtually no influence.
Among the main factors contributing to the anchovy crisis—in terms of both population size and body size—is the rise in sea-water temperatures, which alters the availability of essential nutrients such as specific types of plankton. This nutritional deficit hinders the organism’s normal growth and its ability to reach a size suitable for reproduction. Added to this is the direct impact of intensive industrial fishing.
Bluefin tuna, which was already severely depleted in the 1980s to the point of facing biological collapse, has stocks that have been subject to strict quota systems. Although current stocks in the Mediterranean show a good recovery, they have not reached the historical levels recorded between the 1960s and 1970s, ruling out the possibility of an overabundance of tuna.
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