Abstract
The growth and maturation of one-year-old plants of Eisenia bicyclis were investigated by the leaf-marking method from June 1988 through June 1989 at Oshika Peninsula on the Pacific coast of northeastern Honshu, Japan. During this year, stips grew from 1 to 3cm in arm length and from 25 to 100g in weight. The leaf area and weight of lateral blades showed a seasonal peak in August or September and a low from October to December. Lateral blades grew rapidly from April to June because of the enlargement in their weight and length and increases in the number of lateral blades and number of bladelets per lateral blade. The lateral blades with sori were observed from October to December, when the leaf area and weight showed a seasonal low. Plants were found to produce 54 lateral blades and to discard 36 lateral blades in a year. From the wet weight of lateral blades and the number of lateral blades falling off per year, it is estimated that the annual fallout product of one-year-old plants is about 0.8kg in wet weight.
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