Scyphozoa |
Rhizostomeae |
Rhizostomatidae
Environment: milieu / climate zone / गहराई सीमा / distribution range
पारिस्थितिकी
पिलाजिक; गहराई सीमा 0 - 176 m (संदर्भ 122799). Subtropical; 52°N - 29°N, 117°E - 142°E (संदर्भ 121705)
Northwest Pacific: endemic to the East Asian Marginal Seas.
Length at first maturity / आकार / Weight / Age
परिपक्व अवधि: Lm ? range ? - ? cm Max length : 200 cm WD पुल्लिंग / अलिंग; (संदर्भ 99323); अधिकतम प्रकाशित वज़न: 200.0 kg (संदर्भ 3010); अधिकतम सूचित उम्र: 1.00 वर्षो (संदर्भ 100320)
One of the largest jellyfish species (Ref. 3010). Occurrence of jellyfish bloom has threatened the fisheries in Japan since early 2000s, possibly because of global warming - note that the growth of medusae are dependent on high temperatures (Ref. 100320). Occurs in semi-enclosed basins of marginal seas (Ref. 122853) and also found offshore (Ref. 122855). Before the chitin-covered podocysts develop into adults, they remain dormant for at least 6 years. Jellyfish blooms occur by mass excystment of these podocysts upon exposure to high temperatures (Ref. 100312).
Life cycle: Fertilized egg develops into a planula larva after 1 day. Planula swims for 4 to 8 days until it becomes a translucent, whitish and dome-shaped scyphistoma and settles at the bottom. Becomes a fully-developed scyphistoma after 10 to 20 days of settlement. Also exhibits asexual reproduction by means of podocyst formation (as many as 18 podocysts on a single original scyphistoma within 7 days to 3 months). Scyphistoma colony develops from podocyst of original scyphistoma within 6 months at 18°C. Fully-developed scyphistoma develops into a strobila after a day and becomes a liberated ephyra with 5 to 7 days. Becomes a fully-developed metaphyra within 30 days of post-liberation and becomes a young medusa within 40 to 50 days of post-liberation (Ref. 3004). Furthermore, ephyrae are released into the plankton during early summer. After subsequent sexual reproduction, the medusae die during winter. The life span of the medusae is less than a year (Ref. 100320).
Kawahara, M., S.-I. Uye, K. Ohtsu and H. Iizumi 2006 Unusual population explosion of the giant jellyfish Nemopilema nomurai (Scyphozoa: Rhizostomeae). Mar. Ecol. Prog. Ser. 307:161-173. (संदर्भ 3004)
IUCN Red List Status
(संदर्भ 130435: Version 2025-1)
CITES status (संदर्भ 108899)
Not Evaluated
CMS (संदर्भ 116361)
Not Evaluated
Threat to humans
Harmless
Human uses
मात्स्यिकी: व्यापारिक
| FishSource |
साधन
अधिक जानकारी
PhysiologyOxygen consumption
Human RelatedStamps, coins, misc.
इंटरनेट स्रोत
Estimates based on models
Fishing Vulnerability
Moderate to high vulnerability (50 of 100).
Price category
Unknown.
![Image of Nemopilema nomurai (Nomura\](/images/thumbnails/jpg/Tn_Nenom_u0.jpg "Image of Nemopilema nomurai (Nomura\")