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MOE home > Nature and Parks > EBSA home > Coastal Area > 13902 Adjacent waters of Okitsu, Shimanto River mouth


Coastal Area 13902 Adjacent waters of Okitsu, Shimanto River mouth

Basic Information A separate window opensReferences

Relevant municipalities Kuroshio, Shimanto City, Shimanto Town, Kochi Prefecture
Area (km2) 102

Reason(s) for selection A separate window opensCriteria

Selected due to high levels for the criteria 1and 3, and selected by MARXAN software.

Characteristics A separate window opensReferences

These waters extend from Cape Okitsu in Kochi Prefecture along Cape Ino to the area of the mouth of the Shimanto River. The sandy beaches of Okitsu are gently shelving shallow sandy beaches where creatures typical of sandy beach ecosystems, such as Latona cuneata, Gomphina semicancellata, Cyclosunetta menstrualis, and others can be seen in abundance (Kato, 1999). The Shimanto River mouth is a habitat for Zostera japonica, and communities of green laver are visible here as well. In the mouth area habitation by Japanese lates, mangrove red snappers, and mudskippers has been confirmed. In addition, it also is habitat for fiddler crabs (Ministry of the Environment, 2001). In addition, one of the two pods of Bryde's whale in the vicinity of Japan is distributed in these waters (Hattori, Yamamura, 2014a).

Environment / Habitat infromation A separate window opensData source

Tidal mud flats (km2) 0.101
Moba (seaweed bed) (km2) 5
Coral reef coverage (km2)
Natural coast (km) 32.9
Rate of natural coast (%) 54.8
Sand bank / submerged sand bank
Other habitats

Species information (*) A separate window opensData source

Criteria 1
Lates japonicus (Japanese lates)
Cottus kazika (Fourspine sculpin)
Lateolabrax latus (Blackfin seabass)
<Bivalva, Gastropoda>
Angustassiminea castanea
Stenomelania rufescens
Meretrix lusoria
Assiminea parasitologica
Corbicula japonica
Angustassiminea yoshidayukioi
Criteria 2
Balaenoptera edeni (Bryde's whale)
Charadrius dubius (Little Ringed Plover)[Br/Ne]
Pandion haliaetus (Osprey)[Br/Ne]
Caretta caretta (Loggerhead Turtle)
Parapristipoma trilineatum (Chicken grunt)[Sp]
Etrumeus teres (Red-eye round herring)[Sp]
Engraulis japonicus (Japanese anchovy)[Sp]
Seriola quinqueradiata (Japanese amberjack)[Sp]
Trachurus japonicus (Japanese jack mackerel)[Sp]
Criteria 3
Lates japonicus (Japanese lates)
Anguilla japonica (Japanese eel)
Cottus kazika (Fourspine sculpin)
Gymnogobius scrobiculatus
Leucopsarion petersii (Ice goby )
Apocryptodon punctatus
Nematalosa japonica (Japanese gizzard shad)
Butis amboinensis (Olive flathead-gudgeon)
Cottus pollux (Japanese fluvial sculpin )
Helice (Helice) tridens
Deiratonotus cristatus
Parasesarma plicatum
Ilyoplax pusilla
Sesarmops intermedium
<Bivalva, Gastropoda>
Stenomelania rufescens
Auriculastra duplicata
Criteria 7
Caretta caretta (Loggerhead Turtle)
Luciogobius guttatus (Flat-headed goby)
<Bivalva, Gastropoda>
Clithon sowerbianus
Stenomelania rufescens
Corbicula japonica

* This is the species list of which meet the criteria. In that matter, this list does not include all species that inhabit the individual area.
Abbreviation in the information is as follows.
[Br/Ne] : Adjacent water of breeding area or nesting site
[Sp] : spawning area
[Ad] : species not used for analysis but add to the list because inhabit information was collected later
[Ex] : species used for analysis but considered to be possibly extinct in the EBSA region (area)
No mark : data of species distribution


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