All of the listed factors can affect the carrying capacity of the pond for the fish species. Here’s a brief explanation for each:
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Dissolved Oxygen supply: Fish require oxygen to survive, and low levels of dissolved oxygen can limit the population size.
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Food supply: Availability of food resources directly impacts the growth and reproduction rates of the fish population.
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Predators: The presence of predators can reduce fish populations, lowering the carrying capacity of the ecosystem for that fish species.
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Disease: Outbreaks of diseases can significantly decrease the fish population, affecting the overall carrying capacity.
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Space: The physical space available in the pond can limit the number of fish that can inhabit the area, thus impacting carrying capacity.
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Human activities: Activities such as pollution, overfishing, and habitat destruction can negatively affect the fish population and reduce the carrying capacity.
Therefore, all of the above factors should be selected as they can influence the carrying capacity of the pond for the fish species.