Abstract
Infestation rates of flatfishLimanda limanda from the southern North Sea (German Bight) were investigated in 1981 and 1982. At three stations, including a dumping area of acid-iron wastes northwest of Helgoland, dabs were examined for the occurrence of lymphocystis and epidermal papillomas. Marked seasonal changes of infestation rates were observed with maxima of diseased fish in March and May (epidermal papillomas 2 % in 1981, 4.1 % in 1982; lymphocystis 7.5 % in 1981, 17.2 % in 1982). Infestation minima were found from June to October. Differences in incidence rates were observed between stations in winter and spring, but not in summer. Both diseases turned out to be size-dependent. Seasonality of the two diseases is discussed in relation to spawning cycle and water quality, including pollution.
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Wolthaus, B.G. Seasonal changes in frequency of diseases in dab,Limanda limanda, from the southern North Sea. Helgolander Meeresunters 37, 375–387 (1984). https://doi.org/10.1007/BF01989318
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DOI: https://doi.org/10.1007/BF01989318