SWIM BLADDER DEVELOPMENT IN VIMBA (Vimba vimba L.) LARVAE

Teresa Ostaszewska; Ryszard Wojda; Marcin Mizielinski

Teresa Ostaszewska
Ryszard Wojda
Marcin Mizielinski

Keywords: VIMBA, LARVAL PERIOD, DEVELOPMENT AND INFLATION OF THE SWIM BLADDER

Abstract

Histological examination revealed that at 18.5^oC swim bladder inflation in vimba (Vimba vimba L.) larvae took place between the fourth and fifth day from hatching. Swim bladder is inflated by ingesting the air from above the water surface and transporting it to the bladder via pneumatic duct (ductus pneumaticus) connected with oesophagus. Swim bladder inflation takes place simultaneously with yolk sac resorption to about 30% of its volume.