成長の抑制されたアサリの移殖による成長と殼形の変化について
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概要
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In those habitats where shell growth is almost supressed due to prevailing unfavorable conditions, the little necked clam is rather malformed, thus giving rise to the “stunted” shell. Two groups of stunted little necked clams were obtained from the tidal flat of Ohsaki, Toyohashi City, Aichi Prefecture. One, called here Type A, consists of shells formerly transplanted to Ohsaki from the adjacent Muro district, and another, Type B, consists of shells native to Ohsaki. Type A of stunted little necked clams had still retained the former form of normally grown shells native to Muro, while Type B was distinguishable from normally grown shells by a rounder curvature of the posterior shell margin and a greater ratio of shell breadth to shell length. In both lots, shells of about 2cm. in length and an estimated age of from two (Type B) to three years (Type A), were transplanted to the clam-bed of Ikawazu, Atsumi Town, in May 1953, and cultured until November for about six months. On the other hand, normally grown little necked clams (about one year of age) native to Ikawazu were used as control. On the basis of the measurements of shell length (L), shell height (H) and shell breadth (B) on transplanting and harvesting, the growth and form of the shell were discussed. The results of the experiment are as follows: 1) After transplantation, the stunted shells of both lots grew as rapid as the shells which were used as control (Tab. 1, Fig. 1). 2) After being cultured under good condititons for six months, the stunted shells, especially Type B, showed a form of shell with the values of H/L or B/L approached to those of normally grown shells (Fig. 3 & 4). 3) B/L, especially, is a value very significant for the treatment of shell form. In the same age group, the larger values of B/L were observed on ill-grown individuals of both stunted and normally grown shells. 4) The form of shells is largely influenced by environmental conditions of the clam-bed. From the results mentioned in 2) and 3), it is suggested that the form of shells may be used as an indicator of the conditions of the clam-bed.
- 公益社団法人 日本水産学会の論文
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