Industrial aquaculture is the inevitable trend for the future of fish farming. As new farming models gradually become widespread, industrial recirculating aquaculture systems (RAS) are leading the industry from agriculture to industrialization. This approach features energy conservation, reduced emissions, minimal land use, high density, and strong controllability, fully aligning with the strategic needs for structural adjustments in current fisheries production.
Water temperature plays a crucial role in the growth and reproduction of fish. For most farmed species, the optimal growth rate can be achieved within the most suitable temperature range. For instance, the ideal growth temperatures for China's primary farmed fish species such as black carp, grass carp, silver carp, bighead carp, common carp, crucian carp, and blunt-snout bream are between 20°C and 32°C. Within this temperature range, the fish's metabolic rate is higher, feeding intensity is greater, and growth speed is faster. When the water temperature is below or above this range, fish growth is inhibited and appetite decreases.
Water temperature also significantly impacts fish reproduction. Many farmed species can ensure normal embryonic development and offspring survival rates only at suitable reproduction temperatures. Moreover, in high-density winter farming of tropical fish, lowering the temperature appropriately can reduce metabolic levels and extend the fish's survival period.
In summary, water temperature is a critical factor in industrial aquaculture, significantly affecting the growth, reproduction, and survival of fish.
Compared to traditional heating equipment, R290 air source heat pumps have a higher energy efficiency ratio (COP). Traditional heating equipment like coal boilers or electric water heaters often consume large amounts of energy to produce the required heat. In contrast, an R290 air source heat pump is a device that generates hot water utilizing heat from the air. It absorbs low-temperature heat from the air, compresses it through a compressor to convert it into high-temperature heat, and then transfers this high-temperature heat to water via a heat exchanger, thereby generating hot water. For example, in southern winters, air source heat pumps can achieve a COP of over 3.5, while in extremely low temperatures in the north, they can still reach a COP of over 2.5. This means that R290 air source heat pumps can save a substantial amount of energy, reducing energy costs for industrial fish farming.
Using R290 air source heat pumps does not produce harmful gases like carbon dioxide, having a minimal impact on the environment. Traditional heating equipment typically uses fuels like coal or natural gas to generate heat, consuming significant amounts of energy and producing large quantities of greenhouse gases like carbon dioxide, which lead to severe environmental pollution. In contrast, R290 air source heat pumps use heat from the air for heating, emitting almost no greenhouse gases such as carbon dioxide, greatly reducing environmental pollution. This approach aligns with China's current energy conservation policies and the strategic requirements for sustainable economic development.
R290 air source heat pumps can precisely control water temperature, ensuring stable water temperatures for an optimal environment for fish growth and reproduction. They offer high accuracy in temperature control and can adjust water temperatures as needed to maintain them within the suitable range. For example, in industrial shrimp farming, water temperatures need to be maintained between 13-28°C for optimal growth, and R290 air source heat pumps can meet this requirement. Stable water temperatures benefit fish growth and reproduction, improving survival rates and growth speeds.
