Octopus: Semelparous Reproduction
Female octopuses typically die after their eggs hatch. They stop eating while guarding the eggs and usually die shortly after the young emerge. This pattern is a form of semelparity, where reproduction is followed by death.
Salmon: Exhaustion After Spawning
Pacific salmon species often die after spawning. They swim upstream, reproduce, and then perish due to extreme physical stress and organ failure. Their bodies provide nutrients that support the surrounding ecosystem.
Other Animals and Reproductive Death
Some other animals, such as certain squid and mayflies, also die shortly after reproduction. In many cases, the process of giving birth or laying eggs triggers rapid physiological decline. For more details on semelparous animals, see this overview from Britannica.
