View source for Kaiyō No.1-class oceanographic research ship

{|{{Infobox ship begin}}
{{Infobox ship image
|Ship image=<!-- Deleted image removed:  [[File:HIJMS Kaiyo No.1.jpg|300px|]] -->
|Ship caption=''Kaiyō No. 1'' in 1939
}}
{{Infobox ship class overview
|Name=''200-ton oceanographic research ship''
|Builders= [[Mitsubishi Heavy Industries]], [[Shimonoseki]] shipyard
|Operators=*[[Image:Flag of Japan.svg|border|20px]] [[Ministry of the Navy of Japan]]
*[[Image:Flag of Japan.svg|border|20px]] [[Ministry of Land, Infrastructure, Transport and Tourism (Japan)|Ministry of Transport]]
*[[File:Ensign of the Japanese Coast Guard.svg|border|20px]] [[Japan Coast Guard|Japan Maritime Safety Agency]]
|Class before=[[Japanese oceanographic research ship Tenkai No. 1|''Tenkai No. 1'']] as IJN
|Class after=[[JCG Kaiyō (1963)|JCG ''Kaiyō'']] as JMSA
|Subclasses=
|Cost=
|Built range=1939&ndash;1943
|In service range=
|In commission range=1938&ndash;1964
|Total ships building=
|Total ships planned=6
|Total ships completed=6
|Total ships cancelled=
|Total ships active=
|Total ships laid up=
|Total ships lost=5
|Total ships retired=1
|Total ships preserved=
}}
{{Infobox ship characteristics
|Hide header=
|Header caption=
|Ship class=
|Ship type=Oceanographic research ship
|Ship tonnage=
|Ship displacement=*{{convert|200|LT|t|0|abbr=on}} gross <ref name="SOW_p52">Monthly Ships of the World (2003), p. 52</ref>
*{{convert|277|LT|t|0|abbr=on}} standing <ref name="SOW_p52" />
|Ship length= {{convert|37.0|m|ftin|abbr=on}} overall <ref name="SOW_p52" />
|Ship beam= {{convert|6.8|m|ftin|abbr=on}} <ref name="SOW_p52" />
|Ship height= 
|Ship draught= {{convert|2.3|m|ftin|abbr=on}} <ref name="Kimata_P338">Jirō Kimata (1999), p. 338&ndash;339</ref>
|Ship draft= {{convert|3.3|m|ftin|abbr=on}} <ref name="SOW_p52" />
|Ship propulsion=*1 × intermediate diesel,<ref name="Kimata_P331">Jirō Kimata (1999), p. 331&ndash;333</ref>
*single shaft, 400 bhp <ref name="SOW_p52" />
|Ship power= 
|Ship speed= {{convert|11|kn|mph km/h|lk=in}} <ref name="Kimata_P338" />
|Ship range= {{convert|7000|nmi|km|lk=in|abbr=on}} at {{convert|10|kn|mph km/h|abbr=on}}<ref name="Shizuo Fukui_II_p925">Shizuo Fukui (1994), second separate volume p. 925</ref>
|Ship endurance= 
|Ship boats=
|Ship troops=
|Ship complement=44 in 1944<ref name="JACAR_C08030773600_P10">JACAR C08030773600, p. 10&ndash;13</ref>
|Ship capacity=
|Ship crew=
|Ship EW=
|Ship armament=*<ref name="Kimata_P331" />
*Type 93 [[Hotchkiss M1929 machine gun|{{convert|13.2|mm|in|abbr=on}}]] AA gun
*Type 92 7.7 mm machine gun
*some [[depth charge]]s
|Ship armour=
}}
|}

The {{nihongo|'''''Kaiyō No. 1''-class oceanographic research ship'''|第一海洋型海洋観測船,|''Daiichi Kaiyō''-gata Kaiyō-kansokusen}} was a class of [[Research vessel|oceanographic research ship]]/[[weather ship]] of the [[Imperial Japanese Navy]] (IJN), serving during [[World War II]]. The IJN official designation was {{nihongo|'''''200-ton oceanographic research ship'''''|二〇〇瓲海洋観測船,|''200-ton Kaiyō-kansokusen''}}.

==Construction==
In 1938, the IJN wanted to investigate the weather and ocean currents in a potential future battlefield. ''Kaiyō No. 1''-class ships were built for the purpose. The IJN made [[Hokkaido]] Fisheries Research Institute ''San'yō Maru'' a sample for the ''Kaiyō No. 1''. All ships were deployed in the Hydrographic Department, and they were directly controlled by the Naval Ministry. Therefore, being government ships, they raised [[civil ensign]], not the [[Ensign (flag)|naval ensign]]. The crew were civil servants except for several [[warrant officer]]s.

All sister ships were built by [[Mitsubishi Heavy Industries]] at [[Shimonoseki]] shipyard.

==Ships in classes==
{| class="wikitable" 
| width="15%" | '''Ship'''
| width="8%" bgcolor= | '''Laid down'''
| width="8%" bgcolor= | '''Launched'''
| width="8%" bgcolor= | '''Completed'''
| width="25%" bgcolor= | '''Fate'''
|-
| {{nihongo|[[Japanese oceanographic research ship Kaiyō No. 1|''Kaiyō No. 1'']]|第一海洋, |Daiichi Kaiyō}}
| 1 March 1939
| 1 July 1939
| 9 October 1939
| Sunk by air raid off [[Derawan Islands|Derawan Island]] {{coord|02|18|N|118|15|E}}<ref name="JACAR_C08030773600_P4">JACAR C08030773600, p. 4</ref> on 19 October 1944.
|-
| {{nihongo|[[Japanese oceanographic research ship Kaiyō No. 2|''Kaiyō No. 2'']]|第二海洋, |Daini Kaiyō}}
| 1 July 1939
| 4 October 1939
| 23 December 1939
| Sunk by [[HMS Talent (P322)|Hr. Ms. ''Zwaardvisch'']] off [[Rembang Regency|Rembang]] {{coord|06|30|S|111|35|E}}<ref name="JACAR_C08030773600_P26">JACAR C08030773600, p. 26</ref> on 15 October 1944.
|-
| {{nihongo|[[Japanese oceanographic research ship Kaiyō No. 3|''Kaiyō No. 3'']]|第三海洋, |Daisan Kaiyō}}
| 3 March 1941
| 22 October 1941
| 17 June 1942
| Missing in action in late 1944; removed from naval ship list on 29 October 1944.
|-
| {{nihongo|[[Japanese oceanographic research ship Kaiyō No. 4|''Kaiyō No. 4'']]|第四海洋, |Daiyon Kaiyō}}
| 23 May 1941
| 20 January 1942
| 17 July 1942
| Survived war at [[Uraga, Kanagawa|Uraga]];<ref name="JACAR_C08011043700_P2">JACAR C08011043700, p. 2</ref> transferred to [[Ministry of Land, Infrastructure, Transport and Tourism (Japan)|Ministry of Transport]] on 29 November 1945; transferred to [[Japan Coast Guard|Maritime Safety Agency]] on 1 May 1948 (hull number HG-01, later HM-01); renamed {{nihongo|''Kaiyō Maru No. 4''|第四海洋丸, |Daiyon Kaiyō Maru}} on 20 October 1949; renamed {{nihongo|''Kaiyō''|海洋}} on 15 December 1956; retired on 26 March 1964.
|-
| {{nihongo|[[Japanese oceanographic research ship Kaiyō No. 5|''Kaiyō No. 5'']]|第五海洋, |Daigo Kaiyō}}
| 6 April 1942
| 12 November 1942
| 28 February 1943
| Survived war at [[Kasaoka, Okayama|Kasaoka]];<ref name="JACAR_C08011043700_P2" /> transferred to Ministry of Transport on 29 November 1945; transferred to Maritime Safety Agency on 1 May 1948 (hull number HG-02, later HM-02); renamed {{nihongo|''Kaiyō Maru No. 5''|第五海洋丸, |Daigo Kaiyō Maru}} on 20 October 1949; sunk by jets of water and [[tephra]]<ref>[http://www.volcanodiscovery.com/bayonnaise_rocks.html "bayonnaise Rocks Volcano"] at volcanodiscovery.com (retrieved 10 October 2012)</ref> from the eruption of [[Myōjin-shō]] on 24 September 1952; struck on 27 April 1953.
|-
| {{nihongo|[[Japanese oceanographic research ship Kaiyō No. 6|''Kaiyō No. 6'']]|第六海洋, |Dairoku Kaiyō}}
| 6 April 1942
| 12 December 1942
| 31 March 1943
| Sunk by [[USS Gabilan (SS-252)|USS ''Gabilan'']] off [[Muroto, Kōchi|Muroto]] {{coord|32|50|N|134|21|E}} on 31 October 1944.
|-
|}

{{Clear}}

==See also==
[[Ministry of the Navy of Japan]]

==References==
{{reflist}}

==Further reading==
*Monthly Ships of the World No.613, ''Special issue "All ships of Japan Coast Guard 1948&ndash;2003"'', {{cite web |url=http://www.ships-net.co.jp/ |title=Kaijinsha}}, (Japan), July 2003
*Jirō Kimata, ''Introductory book of the Japanese small vessels'', Kōjinsha (Japan), December 1999
*''30 year History of Japan Maritime Safety Agency'', Policy and Legal Affairs Division-[[Japan Coast Guard|Japan Maritime Safety Agency]] (JMSA), May 1979
*''75 year History of Mitsubishi Heavy Industries-Shimonoseki shipyard'', Mitsubishi Heavy Industries-Shimonoseki shipyard, 1964
*Shizuo Fukui, ''FUKUI SHIZUO COLLECTION "Japanese Naval Vessels 1869&ndash;1945"'', KK Bestsellers (Japan), December 1994
*{{cite web |url=http://www.jacar.go.jp/english/index.html |title=Japan Center for Asian Historical Records (JACAR)}}, [[National Archives of Japan]]
**Reference code: C08011043700, ''Ships and boats list''
**Reference code: C08030773600, ''Data relevant to Daiichi-Kaiyo-maru (No.1) and Daini-Kaiyo-maru (No.2), October 1944''

{{WWII Japanese auxiliary ships}}
{{1952 shipwrecks}}

{{DEFAULTSORT:Kaiyo}}
[[Category:World War II naval ships of Japan]]
[[Category:Auxiliary ships of the Imperial Japanese Navy]]
[[Category:Japan Coast Guard]]
[[Category:Research vessels of Japan]]
[[Category:Survey ships]]
[[Category:Weather ships]]
[[Category:Ships built by Mitsubishi Heavy Industries]]
[[Category:Ships lost with all hands]]
[[Category:Maritime incidents in 1952]]
[[Category:Shipwrecks in the Pacific Ocean]]
[[Category:Auxiliary research ship classes]]