Had to look for the missing details and here is my answer.
Based on the given scenario above regarding the Red Snapper, my prediction in relation to the biggest impact of this population due to oil leakage is that "the next generation of the Red Snapper population will be the most affected, as adults will not be spawning." Looking at the situation, the oil rig is seeping into the spawning grounds and this would greatly affect the adults. Hope this helps.
