The initial mass of a certain species of fish is 7 million tons. The mass of fish, if left alone, would increase at a rate proportional to the mass, with a proportionality constant of 2/yr. However, commercial fishing removes fish mass at a constant rate of 17 million tons per year. When will all the fish be gone? If the fishing rate is changed so that the mass of fish remains constant, what should that rate be? When will all the fish be gone? The fish will all be gone in years. (Round to three decimal places as needed.) If the fishing rate is changed so that the mass of fish remains constant, what should that rate be? For the mass of fish to remain constant, commercial fishing must remove fish at a constant rate of million tons per year. (Round to the nearest whole number as needed.)