Could you elaborate why you need something different?mfb said:You need a different swimming motion - one that is not time-symmetric.
Could you prove this, or intuitively explain it, or direct me to a source where this is explained? I believe you but would like to understand why.mfb said:Scallop theorem
For low Reynolds numbers, time-symmetric motion in Newtonian fluids won't lead to position changes.
No, not all fish are adapted to swim in extremely viscous liquids. Some fish species have specialized adaptations to swim in these types of liquids, while others may struggle or even die in such environments.
Fish that are adapted to swim in viscous liquids have unique features such as streamlined bodies, flexible fins, and mucus-covered skin that help them navigate through the thick liquid. They also use different swimming techniques, such as undulating their bodies or using their fins to push against the liquid, to move efficiently.
It depends on the fish species and the specific type of liquid. Some fish have evolved to survive in extremely viscous environments, while others may struggle or even perish. Factors such as oxygen levels, temperature, and the fish's physical adaptations play a crucial role in their survival.
The hagfish and the lamprey are two examples of fish that are adapted to swim in incredibly viscous liquids. Both of these species have mucus-covered skin, which reduces drag and helps them move through the liquid more efficiently. Some species of eels and catfish also have adaptations that allow them to swim in thick liquids.
Scientists use different techniques such as high-speed cameras, flow tanks, and computer simulations to study fish swimming in viscous liquids. They also collect data on the fish's physical features and behavior to understand how they are adapted to these environments. Additionally, some researchers also conduct experiments by altering the viscosity of the liquid to observe how it affects the fish's swimming abilities.