Which factor is NOT crucial when selecting a pump for an aquatic system?

In the context of selecting a pump for an aquatic system, the species of fish present plays a minimal role compared to other factors. While different fish species have varying environmental needs and tolerances, these do not directly impact the mechanical performance characteristics of the pump.

Key factors like total pressure against which the pump must operate, desired flow rate, and suction lift are essential considerations as they directly influence the efficiency and effectiveness of water circulation in the system. The total pressure determines how hard the pump needs to work against resistance, the desired flow rate dictates how much water needs to be moved to maintain a healthy aquatic environment, and suction lift helps assess the ability of the pump to draw water from a source.

By focusing on these technical specifications rather than the biological aspects associated with fish species, you ensure that the pump is suitable for maintaining optimal water conditions, which is crucial for the overall health of the aquatic system.