Remittent fever is a high body
temperature which shows fluctuations each 24-hour period but never gets to
normal. The pattern of this fever is not a distinguishable feature of any
disease. For the question given above, Mrs. Harris is describing remittent
fever.
Answer: I think that the reason to this is because the oxygen abundance was too low, the competition for food and other resources was too high, so there could be fish the would be filtered out and be killed.