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UBER DIE AKKLIMATISATIONS VERSUCHE MIT SILBERKARPEN
(Hypophthalmichthys molitrix VAL.)UND MARMORKARPFEN
(Aristichthys nobilis RICH.) UND DAS VORHABEN ZUR
EXTENSIVWIRTSCHAFT MIT SPIEGELKARPFEN (Cyprinus 
carpio L.)IN BRACKWASSERFUHRENDEN INNEREN
SEEGEWASSERN DER DDR 


B. Schildhauer 

Institut fur Hochseefischerei und Fischverarbeitung 
Rostock DDR
 
Abstract
Investigations into acclimatization of phytophagic
cyprinids in stretches of inshore waters in the GDR
were begun in 1973. It could be proved by fish keeping
experiments in cages in the stretches of inshore waters
Kleines Oderhaff, Peenestrom, Rugenboddenkette, Darsser
Boddenkette (Saaler Bodden, Koppelstrom, Bodstedter 
Bodden) that especially in the inner parts of seawaters
(with a relatively low salt content and a high eutrophi-
cation deegree) can be considered for the introduction
of phytophagic cyprinids. Investigations into food
consumption proved that the available phytoplankton is
not taken up selectively. A preference for certain 
species was not discovered. In place with an increased
zooplankton amount there was a negligible increase in
the corresponding amounts in the food. Marking experi-
ments in connection with releasing experiments in coastal
waters showed among other findings less growth in fish in
brackish water (despite a higher food supply) than in the
inland waters of the GDR. The existing temperature diffe-
rences (approximately 3 grade C Tw) between coastal and
inland waters can be seen as reason for this results.
However, the phytophagic cyprinids are an effective 
alternative for fish farming in the partly hipertrophic
inland waters, which will be put into practice in 
connection with the extension of a warm water rearing
production unit in the coastal countryin the 90 ices.
At present studies into extensive fish farming of carp
in the Saaler Bodden - a 8,500 ha large hipertrophic
oligohalinic inland seawater - are being prepared.
Orientating preliminary experiments with marked young
carps are to provide basis data concerning the migration
behaviour, growth results, catch, and the viability of
this system of fish farming. Those questions connected
with the practise of the experiments and the process
of extensive fish farming are under discussion.