The looming issue of water scarcity poses a significant challenge to traditional aquaculture. As these systems, particularly ponds and land-based setups, demand vast water resources for operation, the increasing scarcity of freshwater can severely impede their productivity. Water shortages can lead to unhealthy fish conditions, disease outbreaks, poor growth, and mortality. Moreover, the competition for water resources between aquaculture and other sectors, such as agriculture and domestic use, heightens the threat. In this context, the sustainability and viability of recirculating aquaculture systems, which promise the delivery of fresh seafood like sushi with minimal water usage, become even More compelling.

Poor water quality, due to accumulated waste, chemicals, or a recent algae die-off can also lead to low oxygen levels. Thus, leaving fish to seek relief at the water’s surface. High ammonia or nitrite levels can be particularly harmful to fish. Do a quick water quality test and consider performing a substantial water change if ammonia, nitrites, and nitrates are too high. Alternatively, a water conditioner can quickly bring the levels down.

A fishpond that emits a rotten egg smell may indicate the presence of hydrogen sulfide gas, which has that characteristic odor. Hydrogen sulfide is produced during the anaerobic (without oxygen) decomposition of organic material, such as fallen leaves, dead plants, and excess fish waste.