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 ...

image: Talk about a bait-and-switch. Male representatives of the tropical fish known as swordtail characins have flag-like sex ornaments that catch mates just like the bait on a fishing rod would.

Washington University in St. Louis. "Camera sheds light on mate choice of swordtail fish." ScienceDaily. ScienceDaily, 16 September 2014. <www.sciencedaily.com / releases / 2014 / 09 / ...

Swordtail fish can develop dark pigmented melanomas on their tails. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing ...

An analysis of the genomes of hybrids of distinct swordtail fish species uncovered a lethal incompatibility between certain combinations of nuclear and mitochondrial genes that encode subunits of ...