The Question Lily Fish, also known as the Betta Fish, first came out in the early 20th century. Specifically, the Betta Fish was first discovered in Thailand in the 1830s, but it wasn't until the early 1900s that it gained popularity as a pet fish in the United States.

The popularity of the Question Lily Fish can be attributed to several factors. Firstly, its vibrant colors and unique shape make it a visually appealing species. According to a study published in the Journal of Fish Biology, Betta Fish have a high tolerance for a variety of water conditions, which makes them easy to care for. This ease of care, combined with their striking appearance, contributed to their rapid rise in popularity among aquarium enthusiasts.

Additionally, the Betta Fish's reputation as a "Siamese fighting fish" has played a significant role in its popularity. While this name is somewhat misleading, as Betta Fish are not naturally aggressive towards each other, the myth of their fighting prowess has intrigued many potential pet owners. This myth has been perpetuated by various media outlets and has helped to establish the Betta Fish as a classic pet fish choice.

Furthermore, the rise of social media and online communities has also contributed to the popularity of the Question Lily Fish. As more people share their experiences and photos of their Betta Fish, the species continues to gain a following. According to a report by the Pet Industry Joint Advisory Council, the number of pet fish owners in the United States has been steadily increasing, with Betta Fish being one of the most popular choices.

In conclusion, the Question Lily Fish, or Betta Fish, first came out in the early 20th century. Its vibrant colors, ease of care, and cultural mythology have contributed to its enduring popularity as a pet fish in the United States.