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.
Put another way, the common goldfish lifespan is usually between 10 and 20 years, while the fancy or exotic goldfish lifespan is generally on the order of 8 to 10 years.This assumes that the fish live in a healthy environment, and are well cared for.The environment is really quite important.oldfish do better in a large aquarium, where a lifespan of 10 years is not uncommon. Goldfish living in outdoor ponds often live twice that long, especially when adequately protected form predators such as cats and raccoons.