When an animal only reproduces once in its lifetime and then dies, it is called semelparous.
This is a special way of reproducing that some animals do.
Examples:
The salmon is a semelparous fish, it spawns only once and then dies.
The agave plant is semelparous, it flowers once and then dies.
The semelparous cicada emerges from the ground, sings, mates, and then dies.
The semelparous bamboo blooms once in its life, then it dies.
The semelparous octopus lays eggs and then dies.
The semelparous mayfly hatches, mates, and then dies within a day.