Sensibilität von Seefischen an Bord. Teil 2: Demersale und pelagische Fischarten aus Schleppnetzfängen in der Nord- und Ostsee | Investigations on the sensitiveness of sea water fish on board. Part 2: Demersal and pelagic fish species of the North and Baltic Sea
2000
Münkner, Werner | Kuhlmann, Holmer | Oehlenschläger, Jörg
The sensitiveness of different demersal and pelagic fishspecies of 70 hauls in the North and Baltic Sea in waterdepths of 60 to 250 m and 15 to 80 m, respectively,amount of catch of 100 to 3500 kg and trawling times of0,5 to 6 h on board of the FRV “Walther Herwig III” wasinvestigated. Some demersal fish species , e.g. saithe(Pollachius virens), were even still sensitive, when caughtat a water depth of 250 m at a trawling time of 1,5 h.Generally the number of sensitive fishes was reducedwith increasing water depth, amount of catch, trawlingtime and following storage of the catch on board. Amongdemersal fishes the species without swimbladder and flatfishes were clearly more resistent to mechanical stress.On the contrary, pelagic fish species were generally lessrobust. After trawling times of 2 h no sensitive animalswere observed. In some fisheries there are mixed catchesof demersal and pelagic fish species with differentsensitiveness. In commercial fisheries, there is therefore– under animal welfare aspects – for the time being, noprospect for an improvement of the catching andslaughtering procedure on board
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