Question

3. An experimental fish farm consists of a simple idealized food chain: algae, zooplankton, and fish (that eat only zooplankton). In this pond, the algae grow at a rate of 20 kg per square metre of pond surface per year.

   1. a) How large a pond is required to harvest 100 kg of fish every year? Explain your answer.

   2. b) If you wanted to harvest only fish greater than 1 kg, give two examples of additional information that you would require.

Answer 1

fish. # The food chain we are working with is - Algal - Zooplankton- We know that 1.) Algal Groulth rate=20kg/m^2/ year in each m² = grours 20 kg of algal every year, 2.) Our tropic levels are : 1.) Algal 2.) fish 3.) Zooplankton ( Unless stated that According to 10% Energy laul the energy passed from level to level is only 10% and only 10% of bio mass is pass down (the rest is used in metabolic process). it Algal grow's 20kg/m2 per year Zooplankton will groue 2kg/m² per year and fish will growl 0.2kg /m² per year. so it we want to produce lookg og fish we need a pond with soom² because every Ime provide = 0.2kg of fish/year you want 500kg. 1 x loo 0.2 = 500

b) for having specific weight you have to know to control the population and know the Intake rates After that you could know have much. time a set population needs to grove to the desire weight.