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Changes in fecundity of female North Sea plaice (Pleuronectes platessa L.) between three periods since 1900
Rijnsdorp, A.D. (1991). Changes in fecundity of female North Sea plaice (Pleuronectes platessa L.) between three periods since 1900. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 48: 253-280
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289, meer
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| Abstract |
Variations in size-specific fecundity were studied over a period of seven years between 1977 and 1985 and fecundity-body length relationships were compared between three periods: 1900-1910, 1947-1949, and 1977-1985. Significant differences were observed between years and areas. Fecundity appears to have changed since the early 1900s and 1947-1949. In 30-cm females the present fecundity was about 30-100% higher compared to the first two periods, depending on the area. Fecundity of larger females (50 cm) was similar to that in 1900, but was 30-60% higher than in 1947-1949. Significant differences in length-specific ovary weight were also observed between years and geographical areas, but the variability between years was less than in fecundity. |
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