title: Ageing changes in the Siamese fighting fish, Betta splendens. I. The testis.
mesh_terms: D000375:Aging; D000818:Animals; D005399:Fishes / Q000502:physiology*; D008297:Male; D013091:Spermatogenesis; D013094:Spermatozoa; D013737:Testis / Q000033:anatomy & histology*