Photo: Female hifin lyretail redwag sword In our April 2015 newsletter we ran a photo contest (refer to the photo above). Here’s what the contest stated: “The winner of this photo contest will be the first to correctly identify the two dominant fin genes expressed by the female redwag ... Read More
lyretail
Red Lyretail Swordtail Experiment
One problem with raising lyretail swordtails is that the males are functionally sterile. While they produce viable sperm, they have an elongated gonopodium (a penis-like modified anal fin used to inject sperm into the female), which prevents them from mating. Lyretail in xiphophorines (members of ... Read More