エゾアワビの移殖成長効果について
スポンサーリンク
概要
- 論文の詳細を見る
Seedlings of Haliotis discus hannai Ino were transplanted from the northern seas to southern areas and the effect on growth was examined. 1. Age estimation of the specimens of these abalones was performed by a newly devised method with much satisfactory result besides the usual one : namely, the surface of the shell is cleaned and the annual rings formed on the shell can be fairly easily looked through by approaching the shell above a red electric lamp used in the dark room. 2. Growth rate of the abalone has been compared among shells from the three localities, (1) Okujiri Island, Hokkaido, (2) Onagawa, Miyagi Prefecture and (3) Ibaraki Prefecture. It has become evident that those from locality (3) have a better rate than the other two. 3. Abalones (H. discus hannai Ino) show a tendency to turn to a typical form (H. discus discus) with a better growth rate by transplanting in the littoral of Ibaraki Prefecture. 4. Augmentation of average shell-length by transplantation is seen as follows : in the range of 1.7∿3.0cm in 1 1/2 years, 2.7∿5.0cm in 2 1/2 years and 5.3∿6.6cm in 3 1/2 years. 5, Similarly augmentation of body-weight by transplantation is seen as follows : 2.5 times in 1 1/2 years, 4.0∿6.8 times in 2 1/2 years and 4.6∿14.8 times in 3 1/2 years. 6. After transplantation, the abalones show as much growth rate as the native ones in 2∿3 years, and become a fishing object by attaining a capture-limit size (shell-length 11cm). 7. By estimating the total amount of augmentation based on the growth rate of the transplanted abalones, it is presumed that augmentation of about 6 times in body-weight can be obtained in 3 years.
- 日本貝類学会の論文
- 1965-12-30
著者
関連論文
- 28. 久慈川, 那珂川流域貝塚の形成要因と貝類の利用について(日本貝類学会平成 11 年度(創立 70 周年記念)大会(東京)研究発表要旨)
- No.21 : 那珂川下流域における石器時代貝塚の研究(I. 記念式典及び総会, 日本貝類学会創立 50 周年記念大会)
- エゾアワビの移殖成長効果について