Retinal synaptic arrays: Continuing development in the adult goldfish

Abstract
We report a light- and electron-microscopic examination of the inner plexiform layer of the central retina of young (c. 1 year) and old (3–4 year) goldfish. There were no new neurons added to this region during the growth period. Nonetheless, there were substantially more synapses (per cell, per mm2, or per degree2) in the older retinas. This result is discussed in the contexts of retinal function and neural development.