When it comes to reproduction, most fish are external fertilizers, crop dusting eggs in a cloud of sperm. But swordtails (Xiphophorus) aren’t like most fish. These fish fertilize eggs internally and ...
Differences in adult male size and age at sexual maturity in the Rio Coy (Mexico) population of Xiphophorus nigrensis (Pisces; Poeciliidae) are controlled by genetic variation at a Y-linked locus.
The relative contribution of asymmetries in prior experience, size, and prior residency to the determination of dyadic dominance between unacquainted individuals was examined using pairs of green ...
It's the look of love--when female green swordtail fish see attractive adult males, they mature faster sexually, researchers now find. On the other hand, scientists discovered when young male green ...
Evolutionary biologists studying populations of hybrid fish have found two genes that contribute to melanoma - only the second time people have identified specific genes associated with dysfunction in ...
Are you thinking of keeping fish as pets but don’t know where to start? Take a look at two of the most popular choices for beginners - Guppy fish and Swordtail fish. Here are the reasons why these ...
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