The swimming speed of fish is affected by many factors, such as their size and degree of sexual maturity, flow conditions, water temperature, and even lighting.
For Finnish fish, for example, the maximum speed of safety reaches 2.7 meters per second. The sait tramples at half a meter per second, while the bream advances 0.17 meters per second, the pike 0.13 meters per second and the carp 0.11 meters per second.
These figures refer to speeds in normal swimming situations. When a fish plunges into a prey, for example, speeds can multiply in the short term.
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A sinking fish can move up to 20-30 times its own length per second. Thus, for example, a 25-centimeter trout can crash behind a prey at a rate of more than five meters per second.
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Fast rushes are also pike. When shooting, it can travel more than ten times a second to its own length.
The most enduring in long-term swimming are migratory fish, which have so-called dark muscle in their ribs. Salmon can go upstream at a rate of at least eight meters per second, and even seedlings can reach a speed of almost five meters per second.
The most durable speed swimmer is probably tuna. It has been spotted by a number of the following vessels, traveling at 88 kilometers per hour, or about 24 meters per second.
It should also be mentioned that the slowest moving fish is known to be the dwarf seahorse, ie Hippocampus zosterae. It can only travel about one and a half meters per hour, or less than half a millimeter per second.
Defendant: Hannu Lehtonen
Professor Emeritus of Fisheries, University of Helsinki.
Published in Science 5/2022.
Source: Tiede by www.tiede.fi.
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