Scyphozoa |
Rhizostomeae |
Rhizostomatidae
पर्यावरण: पर्यावरण / जलवायु क्षेत्र / गहराई सीमा / वितरण सीमा
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.
प्रथम परिपक्वता पर लंबाई / आकार / वज़न / आयु
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)
आईयूसीएन रेड लिस्ट स्थिति
(संदर्भ 130435: Version 2025-2 (Global))
CITES स्थिति (संदर्भ 108899)
Not Evaluated
CMS (संदर्भ 116361)
Not Evaluated
मनुष्यों के लिए ख़तरा
Harmless
मानव उपयोग
मात्स्यिकी: व्यापारिक
FAO - Publication: search | FishSource |
साधन
अधिक जानकारी
फिजियोलॉजीप्राणवायु की खपत
मानव संबंधीटिकट, सिक्के, विविध.
इंटरनेट स्रोत
मॉडल पर आधारित अनुमान
मछली पकड़ने की भेद्यता
(संदर्भ 71543) |
Moderate to high vulnerability (50 of 100). |
मूल्य श्रेणी
(संदर्भ 80766): |
Unknown. |
![Image of Nemopilema nomurai (Nomura\](/images/thumbnails/jpg/Tn_Nenom_u0.jpg "Image of Nemopilema nomurai (Nomura\")