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Infidelity produces faster sperms

Until now, it has been difficult to prove that fast-swimming sperms have an advantage when it comes to fertilizing an egg. But now a research team at Uppsala University can demonstrate that unfaithful...

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Genetic conflict in fish led to evolution of new sex chromosomes

University of Maryland biologists have genetically mapped the sex chromosomes of several species of cichlid (pronounced "sick-lid") fish from Lake Malawi, East Africa, and identified a mechanism by...

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Fish study turns colour vision theory inside out

(PhysOrg.com) -- Neurobiologists at the Queensland Brain Institute have found that animals are not always as brightly coloured as they seem - at least not to their counterparts.

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Aquarium fishes are more aggressive in reduced environments, a new study finds

An angry glare from the family goldfish might not be the result of a missed meal, but a too-humble abode. Fish in a cramped, barren space turn mean, a study from Case Western Reserve University has...

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A new fish species from Lake Victoria named in honor of the author of...

Two new species of cichlid fish from Lake Victoria are described by biologists from Naturalis Biodiversity Center (Research Department Marine Zoology) and the Institute of Biology Leiden (Section...

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From flounders to seahorses: Evolutionary success of spiny-rayed fishes detailed

(Phys.org) —Even as the dinosaurs were becoming extinct 66 million years ago, the ancient ancestor of spiny-rayed fishes flourished, eventually giving rise to tens of thousands of species that can now...

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Hormones may help tiny African fish climb social ladder

Want to work your way up the corporate or social ladder?

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Lopsided fish show that symmetry is only skin deep

Putting function before form, members of the Perissodinus genus of fish have developed a hugely lopsided jaw that provides a distinct feeding advantage. Research published in the open access journal...

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Fish facing reflections become feisty but fearful

Fish become feisty but fearful when facing themselves in a mirror, according to two Stanford biologists.

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Female fish abandoned by males to raise offspring on their own

Caring for children can be a tough job, particularly if you are a female cichlid fish.

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Female fish -- and humans? -- lose interest when their male loses a slugfest

You may think of your love for your mate as the noble emotion of a pure heart, but some primitive parts of your brain are taking a decidedly more pragmatic approach to the subject, according to...

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Male African cichlid fish go from 'zero to 60' when mating calls, researchers...

(PhysOrg.com) -- In African cichlid fish society, only the dominant male reproduces. But Stanford researchers have found that if the dominant male disappears, a subordinate cichlid can rise to the...

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B chromosomes affect sex determination in cichlid fishes

B chromosomes have a functional effect on sex determination in a species of cichlid fishes from Lake Victoria, according to a study by Japanese researchers to be published in open-access journal PLoS...

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Paternity of subordinates raises cooperative effort in cichlids

Cichlid male nannies help out, especially if they've been sneaking.

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Cichlid fish: How does the swim bladder affect hearing?

In bony fish the swim bladder primarily serves for buoyancy Moreover, in many species it also possesses acoustic functions: it plays a role in sound production and improves hearing in numerous ways....

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Why are there so many species of beetles and so few crocodiles?

There are more than 400,000 species of beetles and only two species of the tuatara, a reptile cousin of snakes and lizards that lives in New Zealand. Crocodiles and alligators, while nearly 250 million...

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Infrared vision in a cichlid fish

Biologists from the University of Bonn have discovered that the cichlid fish Pelvicachromis taeniatus can see in the near infrared range; this was thought to be unlikely until now. Seeing in the...

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Environmental factors determine whether immigrants are accepted by...

Cichlid fish are more likely to accept immigrants into their group when they are under threat from predators and need reinforcements, new research shows. The researcher suggests that there are...

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Risk management in fish: How cichlids prevent their young from being eaten

For a variety of reasons, many humans choose to adopt children. More surprisingly, adoption is fairly widespread in the animal kingdom, even though it would seem to counteract the basic premise of...

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Disappearing nannies force parents to accept their duties

(Phys.org) —Large helpers (nannies) in a cichlid fish allow the dominant male and female to reduce their personal contribution to their offspring and territory, according to new research published...

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