Changes

Artificial fish ponds were likely the first type of aquarium in antiquity. In ancient Mesopotamia and Egypt, fish were likely placed in artificial ponds, as most cities were located along rivers and fish likely served as sources of food but possibly also amusement. It is possible that sacred fish were kept in temples not so much as pets but rather as symbols of fish gods. For instance, the god Dagon, mentioned in the Bible, was often depicted as a fish god.The Egyptian goddess Hatmehit, similarly, may have had fish represented with her. In Egyptian reliefs, fish have been displayed as being placed in artificial environments, including ponds or lakes created in gardens or specific places. <ref>For more on early fish keeping in Mesopotamia and Egypt, see: Vernon N. Kisling (ed.) (2001) <i>Zoo and aquarium history: ancient animal collections to zoological gardens.</i> Boca Raton, Fla, CRC Press.</ref>

Perhaps China is the best known early culture for developing what became fish pets. China, for over 2000 years, has known to have bred carp for their color and beautify, what we call today as goldfish (Figure 1). The koi, a type of carp perhaps originally from Iran and Central Asia, was likely imported to China and over centuries. The Jing dynasty (265-420 CE) was the first to record the process of raising goldfish for their color. While initially the carp may have been raised for food, it was noticed that sometimes fish produced colors such as orange or red. This led to these fish being bred for their colors in royal settings and estates of the wealthy. The raising of goldfish soon became a source of pride for royal Chinese figures and officials, where goldfish varieties were even raised indoors, enabling some types that would normally die easily in an outdoor environment to thrive and adapt better to the indoors. <ref>For more on the development of goldfish, see: Ricardo Calado, Ike Olivotto, Miquel Planas Oliver, & Joan Holt (eds.) (2017) <i>Marine ornamental species aquaculture.</i> Chichester, West Sussex, UK, Wiley-Blackwell, pg. 4.</ref>

The Romans may have been the first to put glass in their indoor aquariums. Sea fish were popular for food in ancient Rome, where archaeological remains suggest that the Romans may have even constructed their ships to transport live fish through tanks contained within the vessels that would suction in sea water. This taste for live fish may have prompted development of aquarium tanks. At first, Romans seemed to have used marble to keep sea fish in. Later, as glass technologies improved and became more durable, the Romans, by the 1st century CE, began to use glass in tanks. This allowed those wanting to eat fish to view what they were getting more easily. Romans did likely keep fish as pets as well; howeverin ornamental ponds. In fact, they may have been the first to keep saltwater fish as pets. However, their focus it seems most fish tanks were likely used for keeping fish was mostly for foodto eat.<ref>For more on how Romans kept fish, see: 1996. <i>Aquarium Fish Magazine</i>, 8 (9-11), pg. 49.</ref>