Study of the vitality indicator of the red sea urchin Pseudocentrotus depressus seedlings-Response of the tube foot to a decrease of water temperature
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Accession number;06A0769753
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| Title;Study of the vitality indicator of the red sea urchin Pseudocentrotus depressus seedlings-Response of the tube foot to a decrease of water temperature |
| Author;
HAMANO TATSUO
(National Fisheries Univ., JPN)
IKEDA HIROAKI
(National Fisheries Univ., JPN)
FUJISAKI HIROSHI
(Saga Prefectural Genkai Fisheries Res. and Dev. Center, JPN)
ITO YOSHINOBU
(Saga Prefectural Genkai Fisheries Res. and Dev. Center, JPN)
AOTO IZUMI
(Saga Prefectural Genkai Fisheries Res. and Dev. Center, JPN)
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Journal Title;Journal of National Fisheries University
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Journal Code:F0239A
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ISSN:0370-9361
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VOL.54;NO.3;PAGE.121-131(2006)
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| Figure&Table&Reference;FIG.12, REF.8 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;As a morphological indicator to judge the vitality of Pseudocentrotus depressus seedlings, the response of the tube foot to a decrease water temperature was investigated. Study animals (7.1mm on average test diameter) were reared under decreased temperature condition of 6.DEG.C., reduced from 21.DEG.C., for a period of 30 days and the density of chromatophores of the tube feet, attaching ability and number of extended tube feet were daily observed. Finally, an available vitality indicator was selected in both measuring effort and change tendency of values. As a result, the ratio of extended tube foot was selected as a candidate of a practical vitality index. Its monitoring method was proposed as follows: first, a photograph was taken with a digital camera of the dorsal view, second, number of tube feet which extended more than 0.5 times the test diameter/number of all tube feet was calculated, and last, a moving average over the three days was used as the index value. (author abst.) |
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