title: The annual cycle in the testis of the catfish: Clarias batrachus L.
mesh_terms: D000818:Animals; D005399:Fishes / Q000033:anatomy & histology* / Q000502:physiology; D008297:Male; D010507:Periodicity; D010784:Photomicrography; D012669:Seminal Vesicles / Q000033:anatomy & histology / Q000502:physiology; D013094:Spermatozoa / Q000166:cytology; D013737:Testis / Q000166:cytology* / Q000502:physiology