180958
Description
Flashcards by Konrad O'Neill, updated more than 1 year ago
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Created by Konrad O'Neill
over 10 years ago
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| Question | Answer |
| Farmed species must: -grow well under captive conditions -accept prepared i.e. non-living food | -ideally be able to complete its life cycle i.e. breed under captive conditions -not be particularly susceptible to disease -have a high conversion ratio i.e. convert food~flesh efficiently |
| Water quality: -o2 ~bubble o2 through and using stirring paddles -algae filter out excess food and Nitrogeneous waste | -waste build up~feed in regular, small amounts -disease~remove dead + diseased fish and using antibiotics |
| Disease Control: -close contact means disease spreads more quickly -use antibiotics+fungicides -remove dead and diseased fish | Intraspecific competition+predation: -keep fish of different ages and size apart -no overcrowding~large cages -feed regularly in small amounts |
| Why eat fish? -Protein -Vitamin D -Omega 3 | Interspecific Predation cover cages with nets |
| Advantages of Fish Farming: -can selectively breed for larger fish -not depleting wild fish stocks -all same size/age -guaranteed harvest (not larger) | Interspecific Competition Predation -keep different species in different cages -have netting to keep out other fish, reducing competition for food and risk of predation |
| Problems+Environmental Concerns -disease can spread to wild population -release of bacteria+Nitrogeneous waste and can cause o2 depletion + Eutrophication | -releases chemicals e.g. pesticides,antibiotics, which can affect wild food chains -release of mineral ions, e.g. Nitrates can cause Eutrophication -attracts predators to area -habitat destruction |
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