分類 / 名前
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板鰓亜鋼(サメとエイ類) (sharks and rays) >
Carcharhiniformes (Ground sharks) >
Sphyrnidae (Hammerhead, bonnethead, or scoophead sharks)
Etymology: Sphyrna: Probable misspelling of sphyra (Gr.), hammer, referring to their hammer-shaped heads (See ETYFish); mokarran: Arabic vernacular for this shark, described from the Red Sea, possibly from mogharn, horned, referring to the shape of its head (See ETYFish).
More on author: Rüppell.
環境:環境 / 気候帯 / 深さの範囲 / 分布範囲
生態学
海; 汽水性の pelagic-oceanic; 海洋回遊性 (Ref. 87829); 深さの範囲 1 - 300 m (Ref. 37816), usually 1 - 100 m (Ref. 89972). Subtropical; 40°N - 37°S, 180°W - 180°E
Circumglobal in coastal warm temperate and tropical seas (Ref. 13562). Western Atlantic: North Carolina, USA to Uruguay, including the Gulf of Mexico and Caribbean. Eastern Atlantic: Mediterranean and Morocco to Senegal. Indo-Pacific: throughout the Indian Ocean; Ryukyu Islands to New Caledonia and French Polynesia. Eastern Pacific: southern Baja California, Mexico to Peru. Highly migratory species.
初回成熟時の長さ / サイズ / 重さ / 年齢
成熟: Lm 249.5, range 210 - 300 cm
Max length : 610 cm TL オス/雌雄の選別がない; (Ref. 244); common length : 370 cm TL オス/雌雄の選別がない; (Ref. 13562); 最大公表体重: 449.5 kg (Ref. 40637); 最大記録サイズ: 30 年 (Ref. 116211)
背面の脊椎 (合計) : 0; 肛門の骨: 0. A very large hammerhead also with a notch at the center of the head (Ref. 5578). Front margin of head gently curved in juveniles, becoming nearly straight in adults, with slight median notch (Ref. 26938). 1st dorsal fin very high and curved; 2nd dorsal and pelvic fins high and with deeply concave rear margins. Light grey or grey-brown above, white below; fins without conspicuous markings (Ref. 5578).
Body shape (shape guide): elongated.
A coastal-pelagic, semi-oceanic shark, found close inshore and well offshore, over the continental shelves, island terraces, and in passes and lagoons (Ref. 244, 58302). Often bottom and reef associated at 1-80 m (Ref. 58302). Prefers to feed on stingrays and other batoids, groupers and sea catfishes, but also preys on other small bony fishes, crabs, squid, other sharks, rays, and lobsters (Ref. 244, 13562, 1602). A viviparous species, with 13-42 of about 56 to 70 cm young in a litter (Ref. 26938, 1602). Potentially dangerous to people (Ref. 13562) but only few, if any, of the attacks on people can be definitely attributed to it because of the apparent difficulty of distinguishing large hammerhead species involved in attacks (Ref. 244). Caught occasionally by target shark longline, demersal tangle net and tuna gillnet fisheries (Ref.58048). Meat utilized for human consumption (fresh, fresh-frozen, dried-salted, and smoked), liver oil for vitamins, fins for soup, hides for leather, and carcasses for fishmeal (Ref. 244). Its large fins, including the tail, sail-like first dorsal fin, are prized in the Oriental sharkfin trade (Ref. 47737).
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Viviparous with a yolk sac placenta and 13-42 young in a litter (Ref. 244); 6-42 pups after gestation period of ~11 months (Ref.58048). Size at birth between 50 to 70 cm TL (Ref.58048, Ref. 13562).
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 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)
IUCNのレッドリストの状況は (Ref. 130435: Version 2025-2 (Global))
人間の用途
水産業: 商業; ゲームフィッシュ: はい
用具
特記事項
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インターネットの情報源
モデルに基づく推定値
系統多様性指数 (参照 82804) |
PD50 = 0.5006 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00229 (0.00131 - 0.00399), b=3.10 (2.94 - 3.26), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245). |
栄養段階 (参照 69278) |
4.3 ±0.5 se; based on diet studies. |
回復力 (参照 120179) |
低い, 4.5年~14年の倍増期間の最小個体群 (tmax=30; tm=8.2; Fec=13). |
漁業の脆弱性 (Ref. 59153) |
Very high vulnerability (86 of 100). 🛈 |
価格帯 (Ref. 80766) |
High.
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栄養素 (Ref. 124155) |
Calcium = 6.09 [1.31, 34.08] mg/100g; Iron = 0.597 [0.148, 1.835] mg/100g; Protein = 20.7 [18.6, 22.9] %; Omega3 = 0.168 [0.066, 0.417] g/100g; Selenium = 33.5 [10.8, 93.8] μg/100g; VitaminA = 4.93 [1.58, 16.43] μg/100g; Zinc = 0.393 [0.195, 0.737] mg/100g (wet weight); |