Pollutionary effects of waste
discharges from aquatic farms
In order to quantify and compare the pollutionary effect of waste
discharges from large marine farms in Nordic countries, the Norwe-gian
Institute of Water Research (NIVA) recently surveyed waste discharges from
salmonid cage farms in Norway and found that production of about 290000 tonnes
of salmonids in coastal cage culture in 1998 has led to a feed-based pollution
of 4255tons of P and 20286tons of N into the environment of produced fish
(Bergheim, 2000). This annual total load of nitrogen and phosphorus is not very
high in comparison with the total load of these elements in the seawater (Hikanson
et al., 1988). The load of nitrogen
derived from agriculture, industries and waste water treatment in Denmark alone
was estimated to be around 460000tons per year. The only logical reason for
alarm about environmental degradation as a result of expansion and
intensification is that it can cause appreciable increases in its pollutive
effects. Being a new and emerging industry, its potential is greatly overrated,
though social or political considerations may see an urgency in preventing its
expansionIrrespective of how aquaculture compares with other sources of
negative impacts, aquaculture development itself will be affected adversely if
technologies adopted degrade the environment, as has been demonstrated in the
collapse of shrimp farms or the pen culture of milkfish and tilapia in certain
areas. Water quality can seldom be maintained economically in commercial farms
if natural sources are polluted and the environmental integrity of the area is
challenged.
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