The 8th IFB Seminar

The 8th IFB Seminar took place in the conference room of the Institute of Freshwater Biology.

Title: Fish that adapt their buoyancy to the environment

Lecturer: Yoshida Makoto

Affiliation: Special Researcher, Atmosphere and Ocean Research Institute, University of Tokyo

Abstract: Many fishes that swim underwater support their weight by obtaining buoyancy from the air in their swim bladders, reducing energy expenditure during swimming. On the other hand, in situations where sufficient buoyancy is not available, they use gliding swimming, which involves diving without swinging the caudal fin, to reduce the cost of locomotion. I will report on biological research on freshwater catfish and two strains of carp from Lake Biwa, taking into account the quality associated with maintaining buoyancy. I inferred the buoyancy state of Carrera during swimming from the behavioral records of the fish in the wild. Through these studies focusing on the trends in buoyancy regulation according to habitat, we will consider the behavioral adaptation of the three fish species from the perspective of buoyancy.