Nile perch were introduced to Lake Victoria in the late 1950s. Nile perch are hardy fish that can tolerate oxygen conditions as low as 6 mg/L.
Recently, scientists measured oxygen concentration at different depths in Lake Victoria and found that below 70 meters, oxygen
concentrations dropped to less than 1 mg/L.
What would happen if oxygen concentrations throughout Lake Victoria fell to similar levels?
O A The fish populations living above 70 meters would increase.
OB. The fish populations living at 70 meters might move to deeper water.
C. The fish populations living below 70 meters would be slightly stressed.
OD. The fish populations living above, below, or at 70 meters might become extinct.