Question

A fisheries biologist wants to increase the production of lake trout in a lake where there are no forage fish (smaller species of fish that eat zooplankton and are eaten by lake trout). Without forage fish, lake trout eat zooplankton. What are some of the likely consequences of stocking forage fish into such a lake? Answer in 2-4 sentences. What is the single most important factor limiting primary production in oceans? Answer in 1 -2 sentences.

Answer 1

Please find the answers below:

Answer 1: A lake trout prefers the forage fishes for consumption over other sources such as zooplanktons. When forage fishes are stocked up in a lake, the ecosystem of the lake with respecte to the air above it will be highly riched in nature. This is because the deep-residing trout fishes will carve on forage fishes and the forage fishes will in turn consume zooplanktons. This will increase the oxygen exchange of the lake water with air and maintain a balance in population density of all the species. Thus, it would be a nice idea to excute to stock up forage fishes in the lake in order to increase the population of trout fishes.

Answer 2: The single most important limiting factor for primary production in oceans is oxygen avaialability. Since gaseous exchange constantly occurs between the air above water and the sea which is detrimental for survival of aquatic flora and fauna, this will directly have the most important impact on primary production of oceans.