2011 Fiscal Year Final Research Report
Food digestion in forestomach of dolphin : Observation of process and speed using endoscope
| Project/Area Number |
20580212
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | Tokai University |
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Principal Investigator |
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| Project Period (FY) |
2008 – 2011
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| Keywords | 生理 |
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| Research Abstract |
Digestion process in the forestomach of a captive Indo-Pacific bottlenose dolphin(Tursiops aduncus) was observed using endoscope after feeding. Relationship between digestion stages of one prey item and elapsed time was investigated on several prey species. Required digestion time to empty forestomach was observed for some amounts of food. Elapsed time for vomit of undigested squid beaks was also estimated after feeding of an amount of squid beaks. These observations revealed that a prey item of 100g to 200g could be digested within 1.5 to 2 hours after feeding, an amount of food with which the animal is sated could be emptied from forestomach after 12 hours, and most of undigested squid beaks vomited within 24 hours. Furthermore, a part of prey of was digested in artificially conditioned digestive solution to observe difference of digestion speed among prey species. Pepsin extracted from dolphin stomach was tested for its active condition on pH and temperature. These observations and experiments clarified digestion speed in the forestomach of dolphin, and it is expected to be useful to estimate required energy and food amount per unit of time for wild dolphin with analysis of stomach contents.
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[Presentation] Digestion process and evacuation of diet in forestomach of Indo-Pacific bottlenose dolphin(Tursiops aduncus)2011
Author(s)
Ohizumi, H., Koide, M., Kusakabe, H., Uehara, M., Miyazaki, M., Ueda, K., Yanagisawa, M., Nakaosne, R., Suzuki, H.
Organizer
19th Biennial Conference on the Biology of Marine Mammals
Place of Presentation
Tampa City, USA
Year and Date
2011-12-01
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[Presentation] Digestion process of prey in the forestomach of Indo-Pacific bottlenose dolphin(Tursiops aduncus)2009
Author(s)
Koide, M., Uehara, M., Miyazaki, M., Ueda, K., Yanagisawa, M., Nakaosne, R., Kusakabe, H., Ohizumi, H.
Organizer
18th Biennial Conference on the Biology of Marine Mammals
Place of Presentation
Quebec City, Canada
Year and Date
20091013-15
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