Megachasma pelagios, Megamouth shark

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Megachasma pelagios Taylor, Compagno & Struhsaker, 1983

Megamouth shark
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Native range | All suitable habitat | Point map | Year 2050
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Megachasma pelagios   AquaMaps   Data sources: GBIF OBIS
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Megachasma pelagios
Male picture by Carvalho Filho, A.

分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, ) | ITIS | CoL | WoRMS | Cloffa

板鰓亜鋼(サメとエイ類) (sharks and rays) > Lamniformes (Mackerel sharks) > Megachasmidae (Megamouth sharks)
Etymology: Megachasma: megas (Gr.), large; chasma (Gr.), yawning hole or open mouth, referring to its unusually large oral cavity. (See ETYFish);  pelagios: Greek for “of the sea,” referring to its oceanic, epipelagic habitat. (See ETYFish).

Environment: milieu / climate zone / depth range / distribution range 生態学

; 海洋回遊性 (Ref. 51243); 深さの範囲 5 - 600 m (Ref. 58302), usually 120 - 166 m (Ref. 48844). Deep-water; 40°N - 40°S, 180°W - 180°E

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Pacific Ocean: Japan, Indonesia, Philippines, Hawaii and California, USA. Atlantic Ocean: Brazil and Senegal.

Length at first maturity / サイズ / 重さ / 年齢

Maturity: Lm ?, range 540 - ? cm
Max length : 549 cm TL オス/雌雄の選別がない; (Ref. 85838); 709.0 cm TL (female)

簡単な記述 形態学 | 形態計測学

背面の脊椎 (合計): 0; 脊つい: 125. Body stout, tapering posteriorly (Ref. 6871), tadpole-like with larger head and tapering trunk and tail (Ref. 47786). Snout extremely short but broadly rounded (Ref 43278, 47786). Head huge, blubbery (Ref. 6871). Mouth very broad and terminal on head, with corner extending behind the eyes (Ref. 6871, 43278). Jaws huge, protrusible anteriorly but not greatly distensible laterally (Ref. 43278, 47786), lower jaw extending to snout tip (Ref. 6871). Teeth very small, numerous, hooked (Ref. 43278, 6871, 47787). Gill slits moderately long, not reaching dorsal surface of head (Ref. 6871; 43278), internal gill slits lined with dense rows of papillose gill rakers (Ref. 43278). Eyes semicircular (Ref. 47786), with no nictitating membrane (Ref. 43278, 6871, 47786). Two dorsal fins, relatively low and angular; small anal fin; long, narrow pectoral fins; moderate-sized pelvic fin; caudal fin asymmetrical, non-lunate, with a short and strong ventral lobe; upper pre-caudal pit only; caudal peduncle without keels or ridges (Ref, 6871, 43278).

生物学     用語集 (例 epibenthic)

Oceanic, possibly occurring in depths between 150 and 1,000 m (Ref. 6871). Epi- and mesopelagic (Ref. 58302). Feeds on planktivorous prey such as euphausiid shrimps, copepods and jellyfish (Ref. 6871). May also eat small midwater fishes. Ovoviviparous (Ref. 50449). Possibly less active than the basking and whale sharks (Ref. 6871). Its feeding habits and habitat suggest that it may be a rare catch in the future. Ovoviviparous, embryos feeding on yolk sac and other ova produced by the mother (Ref. 50449). Males mature by 400 cm (Ref. 6871). A bright white band on the snout just above the upper jaw may play a role in feeding behavior or with recognition of individuals (Ref. 47761). Preyed on by the semi-parasitic cookiecutter shark, Isistius brasiliensis.

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | | 生産力 | 幼生

Exhibit ovoviparity (aplacental viviparity), with embryos feeding on other ova produced by the mother (oophagy) after the yolk sac is absorbed (Ref. 50449). Distinct pairing with embrace (Ref. 205). Size at birth <177 cm (Ref. 85838).

主な参考文献 Upload your references | 参考文献 | コーディネーター | 協力者

Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 1 - Hexanchiformes to Lamniformes. FAO Fish. Synop. 125(4/1):1-249. Rome, FAO. (Ref. 247)

IUCNのレッドリストの状況は (Ref. 130435)

  軽度懸念 (LC) ; Date assessed: 09 November 2018

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

Harmless





Human uses

水産業: 興味がない
FAO - 水産業: 種の外形; Publication: search | FishSource |

より多くの情報

共通名の
類義語
代謝
捕食動物
生態毒性
繁殖
成熟
放精
卵の集合体
生産力

卵の開発
Age/Size
成長
体長-重さ
Length-length
体長組成
形態計測学
形態学
幼生
幼生の動力
補充
豊度
BRUVS
参考文献
水産養殖
水産養殖の紹介
緊張
遺伝子の
Electrophoreses
遺伝
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行列
Nutrients
Mass conversion
協力者
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シガテラ(食中毒の名前)
速度
泳ぐ 型式
カマ
Otoliths

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Estimates based on models

Preferred temperature (Ref. 123201): 9.7 - 23, mean 17.8 °C (based on 247 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 1.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.4   ±0.2 se; based on diet studies.
回復力 (Ref. 120179):  非常に低い, 14年以上の倍増期間の最小個体群 (Fec assumed to be <10).
Fishing Vulnerability (Ref. 59153):  Very high vulnerability (90 of 100).