These traits make swordtails popular pets for many hobbyists and fish breeders. If you’re considering getting a swordtail, there are a few care requirements to keep in mind. Here’s everything ...

Older Female Fish Prefer Imperfect Male Mates, Study Finds Date: November 15, 2005 Source: Ohio University Summary: There’s hope for the less-than-perfect male – if you’re a swordtail fish ...

But swordtails (Xiphophorus) aren’t like most fish. These fish fertilize eggs internally and “give birth” to live young. To help this whole operation, males have evolved external genitalia ...