|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, more
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.