Marine & Coastal
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9 February 2000 |
Fish farm at Tiwi
Islands may be environmental disaster |
Environment Centre demands
public Environmental Impact Assessment
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The Environment Centre
of the Northern Territory called today for Lands Planning and Environment
Minister Tim Baldwin to conduct a full Environmental Impact Assessment
of the barramundi sea cage farm currently being constructed at Port
Hurd on the Tiwi Islands.
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Sea cage fish farms are
increasingly controversial due to a history of serious environmental
impacts around the world.
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Environmental impacts from
tuna sea cage farming have led to a series of court cases in South
Australia recently as well as a Parliamentary Inquiry. Evidence this
year has led to calls within Scottish parliament for an inquiry into
the environmental impacts salmon cage farms including disease passing
from caged fish to wild stocks.
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'To our knowledge this
is unchartered territory for Northern Australia. These will be
the first sea cages used to farm fish between Cape York and Broome
and certainly the first in the NT. This is a large and complex
operation and there are plans to extend it over time. Considering
the impacts sea cages have had elsewhere, Environment Minister
Tim Baldwin will be neglecting his responsibilities if he allows
this operation to commence without a full public and transparent
Environmental Impact Assessment." the Centre's Kirsten Blair
said.
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"We understand that
the company, Pivot, is conducting limited surveys of the area,
however there is no reason why this work should not be made fully
public through an Environmental Impact Assessment. The pristine
marine environment of the Northern Territory is one of our major
assets and it will be a tragedy if the NT starts repeating the
mistakes already made with aquaculture elsewhere in Australia." Ms
Blair concluded.
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More sea cage farming facts:
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Known impacts to the environment
from sea cage fish farming include:
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Pollution of water column and sea bed through
fish faeces and uneaten food. This nutrient rich effluent from
the cages is discharged directly to the sea. Depending on the
tonnage of fish grown in cages this can be the equivalent nutrient
input to the environment to a small town's sewage, effectively
untreated. In the US such pollution is thought to have contributed
to extensive algal blooms.
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Introduction of disease or parasites into wild
stocks of fish. Scientists in Scotland have shown that sea lice
from fish farms are infecting wild stocks of salmon.
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Impact on wild catch fisheries. Contrary to popular
belief fish cages growing carnivorous fish such as barramundi
can increase rather than reduce impacts on wild fish stocks.
Food fish must be caught from the wild then ground up into fishmeal
to be fed to farmed fish. The conversion ratios mean that it
can take more than 1 kilo of 'feed fish' to produce 1 kilo of
aquaculture fish.
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Impact on other wildlife. In South Australia sea cages have
been identified as the number one cause of cetacean deaths. This
occurs when dolphins chasing fish are entangled in the netting
of the cages. Fish cages may also attract other predators such
as seabirds, sharks, other fish and potentially crocodiles.
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For more information contact
ECNT:
Tel:
8981 1984
Email: ecnt@octa4.net.au
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