When an aquatic ecosystem such as a lake experiences an increase in nutrients, what may be the consequence(s)?
1. The Population of most species of fish will increase
2. The Biological Oxygen Demand of the lake water would decrease
3. The biomass of phytoplankton will increase
Choose the correct option from the codes given below:
[A]Only 1 & 3
[B]Only 3
[C]Only 2 & 3
[D]Only 1 & 2

Only 3
Ecological Impacts of Eutrophication oIncreased biomass of phytoplankton, This increases Biological Oxygen Demand oToxic or inedible phytoplankton species oIncreases in blooms of gelatinous zooplankton oIncreased biomass of benthic and epiphytic algae oChanges in macrophyte species composition and biomass oDecreases in water transparency (increased turbidity) oColour, smell, and water treatment problems oDissolved oxygen depletion, this leads to increase in Biological Oxygen Demand oIncreased incidences of fish kills oLoss of desirable fish species oReductions in harvestable fish and shellfish oDecreases in perceived aesthetic value of the water body.