Fish

Share Top Five January 26, 2019

Fish are gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e.,the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term “fish” is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology, unless it is used in the cladistic sense, including tetrapods.The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification,More info:wiki

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#10 Aquarium Fish | How It’s Made,More info:Science Channel

#9 Fish in Formation,More info:hakaimagazine

For small schooling fish—animals too tiny to go fin-to-fin with their toothy foes—sticking together is often their best chance for survival. Scientists know that little fish form tight-knit schools to avoid being eaten. But as new research shows, schooling fish get another advantage—more efficient swimming, and more energy for a hasty retreat from predators.

Schooling fish often swim in a staggered diamond pattern, riding the wake of whoever’s in front. In principle, thanks to the physics of fluid dynamics, this should save the fish some effort. A beating fish tail creates a small vortex in the water behind it. If a fish swims directly behind its leader, these vortices push against it, forcing the follower to swim harder.

#8 UQ triggers reef fish colour vision study,More info:uq.edu

Researchers at The University of Queensland have established that reef fish see colours that humans cannot.

A team from Professor Justin Marshall’s Sensory Neurobiology Lab at the Queensland Brain Institute ran a series of behavioral experiments with trigger fish, in a bid to decode how they see the world.

Professor Marshall said previous studies had looked into how goldfish saw colour, but this was the first study into how reef fish discriminate colours.

#7 Case Western Reserve University researcher discovers fish uses sneaking behavior as stealth mating strategy,More info:thedaily.case.edu

While a dominant male fish from northern Mexico mates with a female, a small fella bides his time in the offing. Suddenly, the little guy darts in ahead of Mr. Big and plants his seeds on freshly laid eggs.

The behavior, which biologists aptly call sneaking, is rare—known to occur among only a few dozen of about 34,000 fish species worldwide. A Case Western Reserve University researcher reports that the Cuatro Ciénegas cichlid, a rare fish by the scientific name of Herichthys minckleyi, uses this alternative stealth mating strategy.

Ron Oldfield, a senior biology instructor at Case Western Reserve, videoed the underdog’s effort to pass on his DNA in a 300-gallon aquarium.

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