posterior root the posterior, or sensory, division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the anterior root to form the nerve before it emerges from the intervertebral foramen; each posterior root bears a spinal ganglion that conveys sensory fibers to the spinal cord.he sensory division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the ventral root to form the nerve before it emerges from the intervertebral foramen.
Freshwater. Many freshwater fish average about 1 to 3 years of life. Some of the more popular species with this short life span include fantail guppies, swordtail platy, mollies, rainbow fish, hatchet fish, corydoras catfish, some cichlids, rasboras and tiger barbs. There are also several fish that live around 3 to 5 years, with proper care and feeding.
Typical Life Span. The average life span of a pet goldfish is five to 10 years. In the wild, they can live as long as 25 years. In fact, the oldest goldfish ever recorded was 43 years old. But prolonging the life of your fish depends on proper care and tank environment.Goldfish require a lot of upkeep.ypical Life Span. The average life span of a pet goldfish is five to 10 years. In the wild, they can live as long as 25 years. In fact, the oldest goldfish ever recorded was 43 years old. But prolonging the life of your fish depends on proper care and tank environment. Goldfish require a lot of upkeep.