Do animals commit suicide?

@yogesh66 (1117)
India
April 28, 2007 1:08pm CST
I have heard that male salmon kill themselves after fertilizing eggs that is laid my females. This is to preserve the nutrition in the lakes so that the young and the mothers have plenty to nourish themselves.
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@kavita23 (2996)
• India
29 Apr 07
I'm only familiar with 'survival of the fittest' theories. I was always taught that an animal's instinct is to stay alive. If you are positive that the male salmon does this for his offspring and mate--that sounds as though he is trying to preserve his species--so it would be a good and honorable instinct within him.