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Scombriformes (Mackerels) >
Gempylidae (Snake mackerels)
Etymology: Rexea: Latin, rex, rego = king.
Eponymy: Daniel Carl [Karl] Solander (1733–1782) was a Swedish naturalist and explorer who was one of Linnaeus’s pupils at Uppsala. [...] (Ref. 128868), visit book page.
More on author: Cuvier.
環境：環境 / 気候帯 / 深さの範囲 / 分布範囲
生態学
海 底生の漂泳性; 海洋回遊性 (Ref. 51243); 深さの範囲 100 - 800 m (Ref. 6181), usually 300 - 450 m (Ref. 28786). Deep-water; 25°S - 48°S, 109°E - 173°W (Ref. 6181)
Southwest Pacific: off southern, southwestern and southeastern Australia, Tasmania and New Zealand. Occurrence records from Madagascar and Japan need to be verified.
初回成熟時の長さ / サイズ / 重さ / 年齢
成熟: Lm 65.0, range 60 - 70 cm
Max length : 110 cm SL オス/雌雄の選別がない; (Ref. 6181); 最大公表体重: 16.0 kg (Ref. 28838); 最大記録サイズ: 16 年 (Ref. 28789)
背面の脊椎 (合計) : 18 - 19; 背鰭 (合計) : 16 - 19; 肛門の骨: 2; 臀鰭: 13 - 16; 脊つい: 36. Body entirely scaled at over 25 cm SL. Lateral line branching below the 5th to the 6th spine of the first dorsal fin. The upper branch reaches beyond the origin of the second dorsal fin, usually ending between the 8th to the 12th soft ray. The lower branch runs mid laterally, undulating above the anal-fin base. Body is bluish above, silvery below, a black blotch distally on two anterior membranes of the first dorsal fin, the rest of the fin is grayish.
Body shape (shape guide): elongated; Cross section: compressed.
Found in schools on continental shelf and slope. They are normally caught close to the sea bed but probably move into midwater at times (Ref. 28786). Juveniles are pelagic, adults also occur near the surface off Tasmania and New Zealand. Dense schools of pre-spawners migrate along the continental slope at about 400 m during winter (Ref. 9563). Feed on fish, squid and crustaceans. The flesh is of good edible quality and especially tasty when smoked. In Australia, the eastern gemfish stock has been subjected to a prolonged period of poor recruitment which started in 1989 (Ref. 28843, 28786). This event resulted in a very significant decline in the gemfish resource. In Australia, efforts are now being channeled towards the recovery of the fishery.
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Larvae are caught in inshore waters which may indicate that gemfish move onto the shelf to spawn, or currents carry larvae in from offshore spawning grounds (Ref. 28786).
Nakamura, I. and N.V. Parin, 1993. FAO Species Catalogue. Vol. 15. Snake mackerels and cutlassfishes of the world (families Gempylidae and Trichiuridae). An annotated and illustrated catalogue of the snake mackerels, snoeks, escolars, gemfishes, sackfishes, domine, oilfish, cutlassfishes,. scabbardfishes, hairtails, and frostfishes known to date. FAO Fish. Synop. 125(15):136 p. (Ref. 6181)
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
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
好ましい温度 (参照
123201): 8.4 - 13.6, mean 10.4 °C (based on 52 cells).
系統多様性指数 (参照
82804): PD
50 = 0.5078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00347 (0.00194 - 0.00621), b=3.14 (2.98 - 3.30), 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 ±0.66 se; based on food items.
Generation time: 5.4 (4.5 - 6.6) years. Estimated as median ln(3)/K based on 14
growth 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 (K=0.11-0.21; tm=3-6; tmax=16; Fec=500,000).
Prior r = 0.43, 95% CL = 0.28 - 0.64, Based on 2 full stock assessments.
漁業の脆弱性 (Ref.
59153): High vulnerability (58 of 100).
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気候脆弱性 (Ref.
125649): High to very high vulnerability (65 of 100).
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栄養素 (Ref.
124155): Calcium = 11 [4, 29] mg/100g; Iron = 0.306 [0.113, 0.902] mg/100g; Protein = 15.6 [13.2, 18.3] %; Omega3 = 0.228 [0.114, 0.465] g/100g; Selenium = 25.8 [10.5, 61.4] μg/100g; VitaminA = 15.4 [3.4, 72.8] μg/100g; Zinc = 0.291 [0.195, 0.444] mg/100g (wet weight); based on
nutrient studies.
