In places the Benguela current is like a thick soup, with swirls of orange or yellow plankton. There are patches with 5 jellyfish per square meter, just as far down as one can see from the boat. And lots of live jellyfish mean lots of dead, stranded jellyfish. Everywhere. Every day. People slip on them on the boardwalk like on banana peels.
Today, the following question harassed my mind: if a blue whale eats 4 tons of krill per day, how many shrimps is that? Our team did some quick calculations and arrived at the following answer: 40 million krill lose their lives every day so that one blue whale can get its belly full. That is more than the population of the Nordics combined. Actually, it is 8 times the population of Finland. All in 2 big feeds, if the whale is lucky.
Krill apparently live up to 10 years of age, with an average lifespan of 6 years. Say that the average age of the krill population swallowed by a whale is 4 years, corrected for any young (unfortunate) krill. That means that during one day, a single blue whale obliterates 160 million life years. That is a whole lot of life experience lost. Even if it is only the life experience of a lowly krill.
(Walvis Bay, Namibia; June 2017)