Aquaculture 0.0 / 5 ? GeographyWater and riversGCSEEdexcel Created by: SpindlesTheRaspberryCreated on: 25-03-17 18:50 Overfishing Overfishing is a problem because modern technology is too efficient Modern techniques include: Long lining - using a fishing line with multiple smaller lines attached at intervals, allowing many fish to be caught on hooks at once Sonar - using sound waves underwater to locate shoals of fish Factory freezer shipping - processing of fish into ready to sell products (eg. fillets, fingers) on board a ship. 1 of 4 Aquaculture in Scotland Aquaculture - commercial fish farming in underwater cages/ponds Used for fish, crustaceans, molluscs and aquatic plants Seen as a solution to overfishing, as it does not deplete ocean fish stocks after the initial groups are caught. Steadily growing in popularity since 1970 Aquaculture of Atlantic salmon, rainbow trout, brown trout and halibut is a big business in Scotland Most of it takes places on the Atlantic coast, and the Shetland islands 2 of 4 Issues and risks Fish sewage all collected in one place - adds potentially harmful extra nutrients to the ecosytem (could cause algal blooms) Non-native species escape - may out compete local species, with the possibility of causing extinctions GMO fish escape - may out compete local non-GMO species Diseases and parasites - local diseases spread rapidly in small enclosure then are passed to local species New diseases - non-local fish may bring new diseases that could potentially wipe out local species Herbicides and drugs - can affect outside local fish or even the wider ecosystem Predators - seals, sea lions, sharks, birds and others may get tangled in nets Fish meal/oil - use of wild fish to feed farmed fish increases pressure on global fish stocks 3 of 4 Issues and risks - diagram 4 of 4
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