Wednesday, November 23, 2011

FishyFact 10

As a rule of thumb, between 20% and 50% of most wild fish populations die each year from natural causes.
Left: A school of tarwhine. Most fish populations suffer very high natural mortality rates.
Photo courtesy:

1 comment:

  1. AnonymousJune 30, 2013

    Isolated factoids like this here are exceptionally misleading out of context. If we add considerably more mortality via fishing, then the total mortality rate exceeds the rate of recruitment. We've seen this mistake repeated many many times, with one of the most famous examples being the Atlantic cod. Moreover, when we heavily select for the largest fishes, we remove genetic diversity associated with rapid growth and large size, so it is very difficult to get the population to recover as it was before. Just thought I'd some more facts to complete the picture a little more fully.