AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Perophora japonica [WoRMS] | |
Authority | Oka, 1927 | |
Family | Perophoridae | |
Order | Phlebobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Country: Japan Country: Korea, Democratic Peoples Republic of Country: Korea, Republic of Country: Russia Comments: NW Pacific |
Life form / Life stage (?) |
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Sociability / Life stage (?) |
Comments: Perophora japonica is a colonial tunicate composed of translucent, yellow-green, round zooids which are connected by stolons. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Asexual Sexual References: Smithsonian Environmental Research Center (2024). Perophora japonica species summary. Available at: https://invasions.si.edu/nemesis/species_summary/206908 (Accessed: 22 July 2024). Comments: Colonial tunicates reproduce both asexually, by budding, and sexually, from fertilized eggs developing into larvae. Buds form from the stolons. Colonies vary in size, and can range from small clusters of zooids to huge spreading masses. The zooids are hermaphroditic, with eggs and sperm being released to the atrial chamber. Eggs may be self-fertilized or fertilized by sperm from nearby animals, but some species have a partial block to self-fertilization. Embryos are incubated within the atrial chamber, and hatch into tadpole larvae, with a muscular tail and a notochord, eyespots, and a set of adhesive papillae. |
Developmental trait (?) | Lecithotrophy References: Smithsonian Environmental Research Center (2024). Perophora japonica species summary. Available at: https://invasions.si.edu/nemesis/species_summary/206908 (Accessed: 22 July 2024). Comments: The lecithotrophic (non-feeding, yolk-dependent) larvae are expelled on hatching, and swim briefly before settlement. Swimming periods are usually less than a day, and some larvae can settle immediately after release, but the larval period can be longer at lower temperatures. |
Characteristic feeding method / Life stage (?) |
Comments: Feeds on phytoplankton and detritus. |
Mobility / Life stage (?) |
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Salinity tolerance range (?) | Venice system: 6. Polymixohaline [18-30psu] 7. Euhaline [30-40psu] |
Habitat modifying ability potential (?) | Unknown Comments: Not available. |
Toxicity / Life stage (?) | Unknown Comments: Not available. |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Not known Comments: Not available. |
Known economic impact? | Not known Comments: Not available. |
Known measurable environmental impact? | Not known Comments: Not available. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF]. Available at: (https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf) |
Association with vessel vectors (?) | Unknown References: Minchin, D., Nunn, J., Picton, B. 2016. The most nothern records of the exotic ascidian Perophora japonica Oka, 1927 (Ascidiacea: Perophoridae) in the north-east Atlantic. BioInvasions records., 5(3), pp. 139-142. Comments: This species was likely introduced by fouling on ships hulls or through aquaculture transfers. |
Last update by | Sandra Gečaitė, 2024-07-22 |