Which method can be used to physically remove or limit fish movement in an environment?

The method of mechanical control is indeed the correct choice for physically removing or limiting fish movement in an environment. Mechanical control typically involves the use of physical barriers, nets, traps, or other devices that directly manipulate the environment or the organisms within it. This approach allows for targeted removal of fish populations or can prevent their movement into certain areas, thereby helping to manage aquatic ecosystems effectively.

The focus on physical methods distinguishes mechanical control from chemical control, which involves the use of chemicals to manage populations, often with broader ecological implications. Restocking pertains to the introduction of fish or other aquatic organisms to a body of water, which is not a method for controlling the movement of fish. Biological control involves the use of natural predators or competitors to manage populations, which also does not directly relate to physically manipulating fish movement in the same way that mechanical methods do.