Ecklonia cava, also called paddle weed, kajime (Japanese: 搗布[2]/未滑海藻), noro-kajime, or gamtae (Korean: 감태), is an edible marine brown alga species found in the ocean off Japan and Korea.
It is also identified as a viable colloid source for use in the biotech industry.[7]
Nomenclature
Ecklonia cava answers to the English common name "paddle weed"; it is also referred by the common names "kajime" or "noro-kajime"[7] of Japanese origin.
In fact, the standard common name for E. cava in modern-day Japanese is kajime (カジメ), to be distinguished from the wrinkled-leaved Eisenia bicyclis (syn.Ecklonia bicyclis) known by the common name arame (アラメ).[a][9] However, these names are extremely misleading. One pioneering Japanese authority on algae, Kichisaburo Endo [ja], had noted that the terms kajime and arame are confounded regionally, and some places call the kajime "arame", and vice versa.[2][b]
The confusion of the names kajime and arame persists to the present day.[12]: 119 The converse example where the name kajime is applied to E. bicyclis occurs in Endo (1903),[12]: 119 and the tendency to call this plant kajime[11]: 49 or kachime[12]: 118 or kaome[10]: 268 occur in Shizuoka Prefecture.
And historically (going back to the Nara Period), arame seems to have signified either of these seaweeds, and that the term kajime (kachime) was not a name for a different plant, but for the same groups of seaweeds processed into dried powders. This conclusion is derived from studies on wooden shipping tags (mokkan) from the 7–8 centuries: the products labeled as arame (滑海藻/阿良女) are conjectured to have been E. cava or E. bicyclis, depending on the places of origin recorded on the tags.[13] The products labeled as kajime/kachime (未滑海藻/加知女) were likely to signify pulverized forms of either seaweed (rather than a different type of seaweed), as explained in the Wamyō Ruijushō dictionary, which represents to the word kajime as 搗布,[13][14][15] which literally means 'pounding cloth/seaweed'.[e]
There are two other algae taxa Ecklonia kurome (Japanese: kurome) and the Eisenia bicyclis (arame) of similar appearance, habitat, and distribution; the E. kurome are distinguishable by the wrinkled lamina, while E. bicyclis have lamina that are also wrinkled which become forked.[8][21] The distribution of the smooth-lamina E. cava only extends as far north as the edge of Fukushima Prefecture, while the arame type thrives farther to the edge of Iwate Prefecture.[8] And the wrinkled kurome are far more abundant than the smooth kajime from the Kii Peninsula westward.[8][22]
However, the heretofore taxonomic distinction made between E. kurome and E. cava based on morphology are recognized to have falsely indicated genetic differences, and recent papers treat E. kurome as a synonym.[25] Thus it has been proposed that E. kurome be recognized as a subspecies of E. cava, alongside the tsuruarame [ja] subspcies (Ecklonia cava ssp. stolonifera).[17]
The algae determined to be kajime based strictly on morphology have been reported in Shikoku, parts of Kyushu, and southern coasts of the Sea of Japan,[26][18][22] but these tend to be the kurome or tsuruarame subspecies.[17][19]
Ecosystem
It usually creates seaweed beds( marine forests) in waters 2–25 m (6.6–82.0 ft) deep, and can grow to be over 130 cm.[27] As a brown alga, it plays an important role in the ecosystem and habitat of where it lives, providing a source of food and shelter for many marine organisms.[28] They are the primary producers of their ecosystem, and many animals use them as locations for reproducing.[29]
Despite its importance in ecosystem functioning and uses for humans, Ecklonia cava has been decreasing in numbers within recent years.[16] Many factors could contribute to the decline, such as an increase in water temperature, overgrazing, and overuse by humans, but the direct cause of the decrease has not yet been extensively studied. Some evidence suggests an increase in water temperature is responsible, while the low availability of nitrogen in the water can also cause higher death rates.[30][29] A combination of both factors is likely responsible, since higher temperatures cause lower availability of nitrogen.
Ecklonia cava is an important food source for snails, such as Littorina brevicula (Philippi) and Haliotis discus (Hannai Ino), and other marine organisms.[31] According to one aquacultural experiment, farmed abalone gain 1kg in weight for every 15 kg of this seaweed consumed.[9] Interestingly, it has also been shown that Ecklonia cava has a defense mechanism that causes it to be less palatable after having already been attacked by a herbivore, and these defenses are specific to each species of herbivore.[31] Many species of seaweed and other plants have defenses similar to this, but the specificities of each defense have not been pinpointed.
Human uses
Medicinal uses
The health benefits of Ecklonia cava and its chemistry have been somewhat studied, leading to its uses in dietary supplements and herbal remedies.
Though its health benefits are not yet entirely understood, it is also regularly touted as an herbal remedy for insomnia, hair loss, high cholesterol, asthma, and even erectile dysfunction. Although it is likely safe to consume in most cases, there is limited or no evidence to support many of these claims.
Culinary uses
Use of seaweed (brown algae) as food can be traced back to the fourth century in Japan, and to the sixth century in China.[34] The arame in the loose sense (either E. cava or E. bicyclis) are known to have been trafficked in quantity at least since the Nara Period, as evidenced by wooden tags on transported good (mokkan) which have survived from the 7–8 centuries.[13] The collection of these seaweeds were imposed on Ise Province (Mie Prefecture) during the Nara period, to be sent as tribute to the imperial central government, and later both Ise and Shima Provinces (Mie Prefecture) were subjected to this levy, according to the Engishiki.[35]
Though these seaweeds are attested to have been eaten in these ancient times,[8] the details of the culinary use are unknown, though it has been speculated that these seaweeds were consumed as food in a manner similar to how they are used today.[35] These seaweeds are usually preserved dried so as to retain its sliminess after rehydrating, and they can be chopped up into miso soup to add sliminess. Or after removing its slime, they can be turned into simmered dishes (nimono).[35] Nowadays only the juvenile algae are harvested for food in most region, using the large full-grown adults is rare.[8] The kajime is considered to be of inferior quality in taste compared with arame and kurome.[8]
The South Korean company Badasoop grows, processes, and exports Ecklonia cava.[36]Ecklonia cava on its own may be consumed in salad and soups, but its dried powder is also used as flavoring and coloring agent in candies, rice cakes, miso soups, or kimichi.[33]
In the processing of a more major food seaweed, Hizikia fusiformes (hijiki), portions of Ecklonia cava or Eisenia bicyclis (arame) are added in order to moderate the bitter flavor, as well as toning down the intensely dark (blackish) color.[37]
^Endo (1874-1921) published this source in 1903, and he himself applied the common name arame to E. cava, which is the opposite of present-day convention. Endo also identified kajime as Eisenia arborea and described it as having wrinkles or wave-patterns, which is again contrary to present-day convention which states arame is distinguished by its wrinkles.[9]
^Note that Ise Province (in present-day Mie Prefecture) was a historical production center for these seaweeds, cf. infra, §Culinary uses.
^The phycologist Kibtarō Okamura [ja] (1867-1935), published 1956 who listed E. cava under kajime. Endo (1903) had placed the species under arame.
^It has also been asserted that the character representation kachime/kajime "未滑海藻" is a recurrent error for "末滑海藻", the later meaning 'powder arame', which would make rational sense.[14]
^Kang, K.; Hwang, H. J.; Hong, D. H.; Park, Y.; Kim, S. H.; Lee, B. H.; Shin, H. C. (2004). "Antioxidant and antiinflammatory activities of ventol, a phlorotannin-rich natural agent derived from Ecklonia cava, and its effect on proteoglycan degradation in cartilage explant culture". Research Communications in Molecular Pathology and Pharmacology. 115–116: 77–95. PMID17564307.
^ abLi, Y.; Qian, Z. J.; Ryu, B.; Lee, S. H.; Kim, M. M.; Kim, S. K. (2009). "Chemical components and its antioxidant properties in vitro: An edible marine brown alga, Ecklonia cava". Bioorganic & Medicinal Chemistry. 17 (5): 1963–1973. doi:10.1016/j.bmc.2009.01.031. PMID19201199.
^ abYotsukura, Norishige; Nagai, Kouhei; Tanaka, Toshimitsu; Kimura, Hajime; Morimoto, Kouichi (April 2012). "Temperature stress-induced changes in the proteomic profiles of Ecklonia cava (Laminariales, Phaeophyceae)". Journal of Applied Phycology. 24 (2): 163–171. Bibcode:2012JAPco..24..163Y. doi:10.1007/s10811-011-9664-5. ISSN0921-8971. S2CID254603942.
^ abcAkita, Shingo; Hashimoto, Kazuki; Takeaki, Hanyuda; Kawai, Hiroshi (2020). "Molecular phylogeny and biogeography of Ecklonia spp.(Laminariales, Phaeophyceae) in Japan revealed taxonomic revision of E. kurome and E. stolonifera". Phycologia. 59 (4): 330–339. Bibcode:2020Phyco..59..330A. doi:10.1080/00318884.2020.1756123. S2CID219735655.
^ abTerada, Ryuta; Kawai, Hiroshi; Kurashima, Akira; Murase, Noboru; Sakanishi, Yoshihiko; Tanaka, Jiro; Yoshida, Goro; Abe, Tsuyoshi; Kitayama, Taiju (2013). "Nihonsan konbumoku kaisō 5 shu no bunpu to monitaring shihyōshu to shite no hyōka" 日本産コンブ目海藻5種の分布とモニタリング指標種としての評価 [Distributions of 5 Laminaria species of Japanese origin, and their assessment as indicator species for monitoring purposes] (PDF). Monitoring site 1000 engan chōsa (Iso・higata・moba) 2008-2012 nendo torimatome hōkokusho モニタリングサイト1000沿岸域調査(磯・干潟・アマモ場・藻場)2008-2012年度とりまとめ報告書: 68–73.
^Tanaka, Toshimitsu; Yamauchi, Makoto; Notoya, Masahiro; Kimura, Hajime; Yotsukura, Norishige (2007). "Wakayamaken engan ni seiiku suru kajime to kurome no keitaiteki oyobi identeki tayōsei ni tsuite" 和歌山県沿岸に生育するカジメとクロメの形態的および遺伝的多様性について [The Morphological Diversity and the Genetic Variation of Ecklonia cava and E.kurome (Laminariales, Phaeophyta) Sporophytes Collected Along the Coasts of Wakayama prefecture]. Aquaculture Science 水産増殖 (in Japanese) (55): 1–8. (with English abstract)
^Kamiya, Mitsunobu (supervis. ed.) (2012). Kaisō: Nihon de mirareru 388 shu no seitaishashin + oshiba hyōhon 海藻 ― 日本で見られる388種の生態写真+おしば標本. Seibundo seikosha. pp. 100–103. ISBN978-4416812006.
^Oyamada, Kumi; Tsukidate, Mario; Watanabe, Keiji; Takahashi, Tatsuhito; Isoo, Tsuneo; Terawaki, Toshinobu (2009), "A field test of porous carbonated blocks used as artificial reef in seaweed beds of Ecklonia cava", Nineteenth International Seaweed Symposium, vol. 2, Springer Netherlands, pp. 413–418, doi:10.1007/978-1-4020-9619-8_50, ISBN9781402096181
^Kim, Sangil; Youn, Suk Hyun; Oh, Hyun-Ju; Choi, Sun Kyeong; Kang, Yun Hee; Kim, Tae-Hoon; Lee, Hyuk Je; Choi, Kwang-Sik; Park, Sang Rul (September 2018). "Stipe Length as an Indicator of Reproductive Maturity in the Kelp Ecklonia cava". Ocean Science Journal. 53 (3): 595–600. Bibcode:2018OSJ....53..595K. doi:10.1007/s12601-018-0022-2. ISSN1738-5261. S2CID90299158.
^ abGao, Xu; Endo, Hikaru; Nagaki, Michiko; Agatsuma, Yukio (2016-07-01). "Growth and survival of juvenile sporophytes of the kelp Ecklonia cava in response to different nitrogen and temperature regimes". Fisheries Science. 82 (4): 623–629. Bibcode:2016FisSc..82..623G. doi:10.1007/s12562-016-0998-4. ISSN1444-2906. S2CID15988866.
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