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Gentle reader, I do hope your mother is alive and well. But this clearly depends on your own age, and probabilistically speaking, under some conditions, she's alive with probability 0.50. I'll go through a few arguments and technicalities related to this statistical curiosum, and indicate the role this and similar calculations play in connection with modern methods for assessing species abundance for fisheries science.
Climate change, and especially alteration in sea temperature, is expected to have major effects on the distribution and abundance of marine fish. This is in particular the case in northern high-latitude marine ecosystems, where IPCC expects global warming to be especially pronounced.