|
Page 1 of 5 Background
All over the world the importance of producing food by aquaculture is
increasing. The overfishing of a big part of world stock of fish make
it nearly impossible to raise the outputs of fishery. So in the future
relevant augmentation will only result from aquaculture. Yet today the
FAO (Food and Agriculture Organisation of the United Nations)
originates the increase of world fishery production from 1994 to 1995
of 3 Mio. t to 112 Mio. t nearly completely by the growth of
aquacultural production. But a further rise of aquacultural production
over the actual portion of ca. 22 Mio. t (ca. 20 %) will also raise the
environmental sensitive outputs. (Krost et al. 1994; CRM 1996; Angel et
al. 1998; CRM 1998a). Furthermore the impact of aquaculture on social
and economic structures is often neglected. (Saint-Paul et al. 1998).
Macro algae Fishery
Today the utilisation of macro algae either from native resources or
from aquaculture has a considerably small market share, but it is
increasing. Today the environmental problems resulting from
aquacultural production of heterotrophic organisms (fish, shell,
cancer) are discussed and first standards of environmental friendly
production are developped (OSPARCOM, Umweltbundesamt). But these
approach is yet missing for the use of macro algae. The biggest part of
the world wide capacity of macro algae is harvested from naturally
grown brown algae as they have the highest portion of alginate (15-40 %
of dry mass). As the semi-industrial harvesting of natural grown algae
is concentrated (eg. Californian coast: 130.000 t, Bretagne: 70.000 t,
Hebriden: 4.500 t), important habitats for lots of molluscs,
crustaceans and fish are lost by this intense fishery.
<< Start < Previous 1 2 3 4 5 Next > End >>
|
