IGCSE marine science 6 4- aquaculture

The syllabus for 6.4:

Candidates should be able to: 

1 describe the social and economic importance of aquaculture 

2 explain that the pressure on fisheries can be reduced by aquaculture but that aquaculture can also impact marine ecosystems 

3 describe the range of species that can be produced through aquaculture and the contribution of aquaculture to global food production

 limited to:

 (a) macroalgae (kelp) 

(b) fish (salmon, grouper) 

(c) crustaceans (shrimp) 

(d) molluscs (mussel, oyster) 

(e) echinoderms (sea cucumber) 

 4 state that fish can be produced in open (cages, nets) aquaculture systems and closed (tanks) systems

 5 outline methods of producing fish by aquaculture 

sourcing of initial broodstock 

maintaining conditions required for the species (temperature, salinity, light, pH, oxygen) 

 ood requirements vary by species (e.g. protein and lipid levels) 

types of feed and their environmental impact (pelleted, other fresh fish or plant-based protein) 

maintaining water quality by removal of waste products through adequate water flow rate and filtration of waste water, or moving cages

 

size sorting and regular feeding to prevent cannibalism 

prevention of entry or spread of parasites, disease or predators by using low stocking densities, antibiotics, cleaner species 

selection of fastest growing organisms as new broodstock 

6 discuss the use of aquaculture of endangered species to restock areas where environmental damage has occurred 

limited to:

(a) mangrove forests 

(b) coral reefs