褐藻アラメの5,6歳個体の成長と成熟

概要

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The growth and maturation of 5- and6-year-old plants of Eisenia bicyclis were investigated by the leaf-marking method from June 1989 through June 1991 at Iwaki on the Pacific coast of northeastern Honshu, Japan. The length, diameter, and weight of each stipe was 50-60cm, ca. 3cm, and 400 ?? 600g throughout the investigation periods, respectively. The arm length was 13 ?? 14cm in 5-year-olds and 16 ?? l7cm in 6-year-olds. The weight of the lateral blades showed a seasonal peak in August or June, and a bottom in December or January, according to the seasonal changes in the weight and length of the lateral blade, the number of bladelets per lateral blade, and the number of lateral blades. Lateral blades with sori were observed throughout the year. The number of lateral blades with sori increased from August through January, when lateral blades without wrinkles on their surface showed an increase. Plants of both 5 and 6 years of age were found to produce 42 lateral blades and to discard 42 blades in a year. From the wet weight and the number of lateral blades falling off each year, it is estimated that the annual fallout product of both 5- and 6-year-old plants is ca. 2.1kg in wet weight.
日本水産學會の論文