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Weitere Ergebnisse von Langzeitbeobachtungen über das Auftreten von Beifangfischen und -krebsen in den Fängen der deutschen Garnelenfischerei (1961-1967)
Tiews, K. (1971). Weitere Ergebnisse von Langzeitbeobachtungen über das Auftreten von Beifangfischen und -krebsen in den Fängen der deutschen Garnelenfischerei (1961-1967). Arch. Fish. Mar. Res. 22(3): 214-255
In: Archive of Fishery and Marine Research = Archiv für Fischerei- und Meeresforschung. Urban & Fisher Verlag: Hamburg. ISSN 0944-1921, more
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    Marine

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  • Tiews, K.

Abstract
    This publication deals with further results obtained in studies on the composition of catches of the German shrimp fishery for the period 1961-1967. The studies initiated in 1954 are based on the analysis of a total of 3,009 unsorted catch samples each of 5 kg in weight, taken from the fisheries carried out from Busum, Cuxhaven, Neuharlingersiel and Dornumersiel along the German North Sea coast. In comparison to 1954-1960, during the research period 1961-1967 a series of changes in the abundance of by-catch-spp was observed. So the by catches of goby, herring, pipe fishes, 3-spined stickle backs, shore crabs, smelt, sea snails, flounder, eel and solenette decreased considerably. On the other and increasing catches were found in dab, sandeel, rockling and cod. All other spp such as plaice, sole, armed bullhead, whiting, eelpout, short-spined sea scorpion, dragonet, gunell and gurnards, remained more or less unchanged in quantity. It was found that these studies permit one to recognize quite early the relative strength of recruit year classes of plaice and cod so that a long term plan for these 2 highly important fisheries will become possible. This is not possible in the case of the sole, since the fishing grounds of the German shrimp fishery along the German coast are covering only the edge of the distribution area of this more warm water living fish. Cold winters frequently observed on the German North Sea coast can lead to a nearly complete extinction of recruit year classes, as was for example the case with the year class 1962, which was found to have been the richest year class in the by-catches of the German shrimp fishery until now, or at least to a considerable natural mortality as described by Rauck (4). For this reason it is merely speculative, to calculate the profit, which one might gain, when fishing young soles on the German shrimp fishing grounds. Among the Annex-II-fish spp of the Northeast Atlantic Fisheries Convention the plaice was holding the 2nd place in the list of abundance of by-catch fish spp, the dab the 3 rd, the sole the 4th, the whiting the 8th and the cod the 13th during the research period under report. The dab surpassed the sole in comparison to the research period 1954-1960.

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