By Jen Mitchell and Laura Ducharme
Looking for a mate in this big pond of Toronto? It’s not easy. Women out number men and competition is fierce. Meanwhile, plenty of fish have got it all figured out. Take the fresh water swordtails for example. If there is a group of all females in an isolated area with no males around, the hormone level in the water will cause some of the females to change into males to keep the species existing. As soon as they make fish babies — they change back into females!
Pet ownership remains on the rise in North America — and this recent wave of general interest includes the aquarium segment of the industry. Interest has been influenced by popular cultural icons like Nemo and advances in technology. According to the American Pet Products Manufacturers Association (APPMA), there are an estimated 150 million pet fish in the US (compared to 74.8 million pet dogs). During the past decade, fish were one of the fastest growing categories of pets (growing more than 20 percent over the previous decade).