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2. Fish locomotion - Wikipedia

   en.wikipedia.org/wiki/Fish_locomotion

   Fish in the order Gymnotiformes possess electric organs along the length of their bodies and swim by undulating an elongated anal fin while keeping the body still, presumably so as not to disturb the electric field that they generate. Many fish swim using combined behavior of their two pectoral fins or both their anal and dorsal fins.

3. Aquatic locomotion - Wikipedia

   en.wikipedia.org/wiki/Aquatic_locomotion

   A great cormorant swimming. Aquatic locomotion or swimming is biologically propelled motion through a liquid medium. The simplest propulsive systems are composed of cilia and flagella. Swimming has evolved a number of times in a range of organisms including arthropods, fish, molluscs, amphibians, reptiles, birds, and mammals.

4. Houndfish - Wikipedia

   en.wikipedia.org/wiki/Houndfish

   While the houndfish has no spines, its dorsal fin has 21–25 soft rays, and its anal fin has 19–22. [2] They are also known to have 80–86 vertebrae. [2] A key way of distinguishing the houndfish from other members of the genus Tylosurus is that the houndfish's teeth point anteriorly when the fish is a juvenile.

5. Porcupinefish - Wikipedia

   en.wikipedia.org/wiki/Porcupinefish

   The porcupine fish (as Diodon antennatus) is mentioned in Charles Darwin's famous account of his trip around the world, The Voyage of the Beagle. He noted how the fish can swim quite well when inflated, though the altered buoyancy requires them to do so upside down.

6. Sensory systems in fish - Wikipedia

   en.wikipedia.org/wiki/Sensory_systems_in_fish

   Fish vision shows adaptation to their visual environment, for example deep sea fishes have eyes suited to the dark environment. Fish and other aquatic animals live in a different light environment than terrestrial species. Water absorbs light so that with increasing depth the amount of light available decreases quickly.

7. Fish kick - Wikipedia

   en.wikipedia.org/wiki/Fish_kick

   The journal published a study that compared swimmers using dolphin kick with fish kick and found that the fish kick was generally faster on a short distance and that it was generally "almost as fast", even though the swimmers had no prior experience with the stroke. [1] The kick has been noted for its difficulty in executing correctly. [4] [5]