Ventilation in the Respiratory Tree of Sea Cucumber, Molpadia roretzi (Holothuroidea; Molpadida)
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Accession number;06A0769757
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| Title;Ventilation in the Respiratory Tree of Sea Cucumber, Molpadia roretzi (Holothuroidea; Molpadida) |
| Author;
YAMAMOTO KEN'ICHI
(National Fisheries Univ., JPN)
HANDA TAKESHI
(National Fisheries Univ., JPN)
SHIRAISHI MASASHI
(National Fisheries Univ., JPN)
NISHIOKA AKIRA
(National Fisheries Univ., JPN)
TABUCHI KIYOHARU
(National Fisheries Univ., JPN)
KAMANO TADASHI
(National Fisheries Univ., JPN)
FUKAMI KIYOHIKO
(National Fisheries Univ., JPN)
ENOSHIMA TAKETOMO
(National Fisheries Univ., JPN)
HIKAGE TADAHISA
(National Fisheries Univ., JPN)
ASANO YOSHIFUMI
(National Fisheries Univ., 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.4;PAGE.159-165(2006)
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| Figure&Table&Reference;FIG.10, TBL.1, REF.12 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Ventilation in the respiratory tree of a sea cucumber, Molpadia roretzi, living in the mud, was examined on the ship (Koyo-maru, 1,988ton) using the method which continuously measured the ventilation volume. One cycle of ventilation was composed of large one exhalation and small 3-10 (mean 4.6) inhalations. The parameters on the ventilation are as follows: inhalation period per one ventilation (Tin) = 58.6sec/cycle, inhalation volume per one ventilation (Vg-in) = 59.0ml/cycle/kg, exhalation volume per one ventilation (Vg-ex) = 58.4ml/cycle/kg, inhalation period per one inhalation = 12.7sec/stroke, exhalation period per one exhalation = 14.5sec/stroke, inhalation volume per one inhalation (Vg-in-st) = 12.8ml/stroke/kg, ventilation frequency (Vf) = 0.6cycle/min, ventilation volume (Vg) = 35.8ml/min/kg. Tin increased with increase of inhalation frequency per one cycle (If), and Vf decreased. Vg-in increased with increase of If. However, Vg showed almost constant, because Vg-in-st showed almost constant and Vf decreased. From the results, the ventilation in the respiratory tree of M. roretzi was similar to that of Apostichopus japonicus which inhabited on the surface; they fixedly maintained the ventilation volume per min, even if the inhalation frequency per one ventilation changed every ventilation. However, in M. roretzi, the ventilation volume in the respiratory tree per unit time was less than A. japonicus, and the inhalation and exhalation into/from the respiratory tree were slowly and largely carried out further than A. japonicus. (author abst.) |
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