Fin whales are the second largest creatures on our planet, surpassed only by blue whales. They can reach a length of around 20 meters—and require up to two metric tons of food per day. Accordingly, they release enormous amounts of nutrients—with significant effects on the ecosystems of the oceans. However, industrial whaling has significantly reduced their numbers. It was geared towards the oil of whales as raw material and was particularly intensive between 1880 and an international agreement in 1986.
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Source: Phys.org