Which of the following indicates a healthy fish population in a managed pond?

A healthy fish population in a managed pond is indicated by stable fish growth rates. When fish exhibit consistent growth, it reflects a balanced ecosystem where food availability, water quality, and habitat conditions are favorable. Stable growth rates suggest that the fish are not under stress from environmental factors or overpopulation, and that the nutrient levels, including oxygen, are adequate to support a thriving community of fish.

In contrast, high levels of ammonia can be detrimental to fish health, leading to stress, disease, and even death. A lack of aquatic plants may indicate poor habitat, reducing the availability of food sources and cover for fish, thereby affecting their well-being and population dynamics. Inconsistent water temperature can stress fish and disrupt their breeding and feeding patterns, negatively impacting their growth and survival. Thus, stable growth rates serve as a clear indicator of a well-managed pond with a healthy aquatic ecosystem.