Kappaphycus
{{Short description|Genus of algae}}
{{Automatic taxobox
| image = Kappaphycus alvarezii.jpg
| image_caption = Kappaphycus alvarezii
| taxon = Kappaphycus
| authority = Doty
| subdivision_ranks = Species
| subdivision = about 6, see text
}}
Kappaphycus is a genus of red algae. Species are distributed in the waters of East Africa, Indonesia, Malaysia, Hainan Island, the Philippines, and Micronesia.Guiry, M. D. In: Guiry, M. D. & G. M. Guiry. 2013. [http://www.algaebase.org/search/genus/detail/?genus_id=35125 Kappaphycus.] AlgaeBase. National University of Ireland, Galway. Accessed 07 November 2013.
Genus Kappaphycus is "morphologically plastic",{{Cite journal |last=Conklin |first=Kimberly Y. |last2=Kurihara |first2=Akira |last3=Sherwood |first3=Alison R. |date=2009-01-31 |title=A molecular method for identification of the morphologically plastic invasive algal genera Eucheuma and Kappaphycus (Rhodophyta, Gigartinales) in Hawaii |url=https://doi.org/10.1007/s10811-009-9404-2 |journal=Journal of Applied Phycology |language=en |volume=21 |issue=6 |pages=691 |doi=10.1007/s10811-009-9404-2 |issn=1573-5176|url-access=subscription }} with few visible characters that can be used to separate the taxa, so distinguishing the species can be difficult. In addition, many commercial varieties have been bred. Molecular analyses can be used.Zuccarello, G. C., et al. (2006). [http://cmbc.ucsd.edu/People/Faculty_and_Researchers/smith/Zuccarello%20et%20al%20J%20Ap%20Phycol.pdf Systematics and genetic variation in commercial Kappaphycus and Eucheuma (Solieriaceae, Rhodophyta).] Journal of Applied Phycology 18(3-5) 643-51.Tan, J., et al. (2012). [http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0052905 Assessment of four molecular markers as potential DNA barcodes for red algae Kappaphycus Doty and Eucheuma J. Agardh (Solieriaceae, Rhodophyta).] PLoS ONE, 7(12), e52905.
In general, these algae have fleshy thalli that grow erect from one or more anchors. The longest individuals can exceed a meter in length. All species produce kappa-carrageenan. Farming of this is a large business in the Philippines. Gavino Trono is a Filipino biologist dubbed the “Father of Kappaphycus farming”.{{Cite web|url = http://www.seafdec.org.ph/2014/dr-trono-new-national-scientist/|title = Dr. Trono is the New National Scientist|date = |accessdate = August 25, 2014|website = |publisher = |last = |first = }}
Kappaphycus alvarezii is widely cultivated as a raw source of carrageenan, and other species are used, as well. Several Kappaphycus are invasive species.Conklin, E. J. and J. E. Smith. (2005). [https://www.nceas.ucsb.edu/~jsmith/PDFs/Conklin%20and%20Smith%20BioInv%202005.pdf Abundance and spread of the invasive red algae, Kappaphycus spp., in Kane'ohe Bay, Hawai'i and an experimental assessment of management options.] Biological Invasions 7(6), 1029-39.