What is the significance of the development of the spine in fish?

The appearance of the spine in fish was of great importance. During evolution, new adaptations appeared in fish. Their size increased, and the structure of the body became more complex. The emergence of the spine allowed fish to have a complex body structure. It supports many bones, creates and maintains the shape of the body. Although it is elastic due to its small thickness, it is enough to avoid various damages. In addition, in water, the stress on the spine in fish is not the same as in land animals.