Geography
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Suggested answers
- Four different species of carp are found in the list
of top ten species produced.
- Salmon is the most traded aquaculture product as it is
a high value commercial species. As it is mostly consumed in the developed
economies of the world, producers receive a high return on their
investment.
- Hobart has an average monthly temperature of 12.5*C
while Shearwater is much cooler at
5.8'C.
- 500 000 tonnes traded out of 34.12 million tonnes
produced represents 1.5%.
- Tassal Ltd. has operations at several sites in
south-eastern Tasmania. Hatcheries in the highlands at Wayatinah, sea farms at a
number of offshore deepwater sites around the Huon estuary and the Tasman
Peninsula, administrative offices in Hobart and processing plants at Huonville
and Dover.
- Salmon farming depends upon a healthy estuarine
environment. The Huon estuary is a clean, cool, marine environment with regular
downstream flushing of fresh water.
- Salmon farming impacts on the environment through the
discharge of wastes into the surrounding marine environment. The main waste
sources include uneaten feed, fish wastes, dead fish, pesticides, anti-foulants
and other solid wastes such as feed bags, ropes and floats. Organic wastes can
exacerbate nutrient build up in the
estuary.
- Increased pollution and waste discharge from urban
development of the Huon valley catchment looms as a potential threat to the
salmon industry. Residential expansion into what is now a semi-rural area could
lead to an increase in the amount of sewage discharged into the Huon River.
Urban run-off carries both solid waste (litter and other detritus) and soluble
wastes like detergents.
- The management decisions made to reduce the threat
posed by water pollution include the introduction of new technologies such as
the use of polyester bags to line the sea-cages. This method enables the company
to control the quality of the water circulating in the sea-cages, filtering out
solid wastes and potentially cleaning polluted
water.
- Possible arguments for the importation of foreign
uncooked salmon
products:Cheaper produce for
consumers
Prevent retaliatory bans or embargoes on other Australian produce by Canada
Some of the arguments against:
The chance of importing diseases into a-disease free industry
Any loss of market share means a loss of jobs.
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