Sensibilität von Seefischen an Bord. Teil 2: Demersale und pelagische Fischarten aus Schleppnetzfängen in der Nord- und Ostsee
2000
The sensitiveness of different demersal and pelagic fish
species of 70 hauls in the North and Baltic Sea in water
depths of 60 to 250 m and 15 to 80 m, respectively,
amount of catch of 100 to 3500 kg and trawling times of
0,5 to 6 h on board of the FRV “Walther Herwig III” was
investigated. Some demersal fish species , e.g. saithe
(Pollachius virens), were even still sensitive, when caught
at a water depth of 250 m at a trawling time of 1,5 h.
Generally the number of sensitive fishes was reduced
with increasing water depth, amount of catch, trawling
time and following storage of the catch on board. Among
demersal fishes the species without swimbladder and flat
fishes were clearly more resistent to mechanical stress.
On the contrary, pelagic fish species were generally less
robust. After trawling times of 2 h no sensitive animals
were observed. In some fisheries there are mixed catches
of demersal and pelagic fish species with different
sensitiveness. In commercial fisheries, there is therefore
– under animal welfare aspects – for the time being, no
prospect for an improvement of the catching and
slaughtering procedure on board
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