Goldfish in clear bowl

The goldfish is one of the most popular aquarium fish worldwide, known for its beauty and ease of care.

About this subject

The goldfish (Carassius auratus) is a freshwater fish native to East Asia, domesticated over a thousand years ago in China. Initially prized for its golden coloring, which resulted from a genetic mutation, it became a symbol of luck and prosperity in Chinese culture. Today, there are over 200 varieties, including the popular lionhead, telescope eye, and comet. Despite being often sold as easy pets, goldfish require specific care: they need ample tanks (minimum 40 liters per fish), proper filtration, and a balanced diet. Their lifespan can reach 10, 15 years under good conditions, far beyond what many believe. In commercial settings like offices and stores, goldfish are popular for their calming aesthetic and apparent low maintenance, but it is crucial to avoid small, overcrowded tanks that compromise their health.

Goldfish breed easily in captivity, with females depositing hundreds of eggs on aquatic plants. They are schooling fish and prefer to live in groups. In Brazil, goldfish are among the most sold ornamental fish, present in pet shops and fairs. However, many are kept in inadequate conditions, such as the famous round bowls, which restrict movement and affect vision due to curvature. The ideal water temperature ranges from 18°C to 24°C; they are hardy but sensitive to sudden changes. Additionally, goldfish are one of the most studied fish in laboratories, contributing to genetics and behavior research.

Interestingly, goldfish have a memory that surpasses the three-second myth. Studies show they can recognize colors, sounds, and even their owners, associating them with feeding. In popular culture, they are often associated with fortune and resilience. In offices, their presence is considered a decorative element that reduces stress, but it is essential to provide an enriched environment with hiding spots and plants. Regular tank maintenance, with partial water changes and parameter testing, ensures the longevity of these animals. The goldfish remains a global icon in home aquariums, uniting tradition and science in coexistence with humans.

Frequently Asked Questions

What is the ideal tank size for a goldfish?

The minimum is 40 liters per fish, but larger tanks are better because goldfish grow and produce a lot of waste.

Can goldfish live in round bowls?

It is not ideal. Round bowls limit space and distort the fish's vision, and they make it difficult to install proper filters.

How long do goldfish live under good conditions?

They can live 10 to 15 years, with some reaching 20 years with proper care, such as a balanced diet and good water quality.