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Carangaria/misc (Various families in series Carangaria) >
Polynemidae (Threadfins)
Etymology: Polydactylus: Greek, poly = a lot of + greek, daktylos = finger (Ref. 45335).
More on author: Günther.
環境:環境 / 気候帯 / 深さの範囲 / 分布範囲
生態学
海; 新鮮な水; 汽水性の 底生の; 降流性の (Ref. 51243); 深さの範囲 0 - 6 m (Ref. 57343). Tropical; 1°N - 28°S, 121°E - 154°E (Ref. 57343)
Indo-West Pacific: from Irian Jaya, Indonesia, Papua New Guinea to southern Queensland, Australia.
サイズ / 重さ / 年齢
成熟: Lm ?  range ? - ? cm
Max length : 170 cm FL オス/雌雄の選別がない; (Ref. 6390); common length : 48.0 cm FL オス/雌雄の選別がない; (Ref. 9685); 最大公表体重: 45.0 kg (Ref. 9685); 最大記録サイズ: 20 年 (Ref. 6390)
Body without spots nor stripes. Pectoral fin rays unbranched; 4th pectoral filament long, 40-53% of SL. Second spine of dorsal fin more robust than the rest. Posterior margin of maxilla extending considerably beyond level of posterior margin of adipose eyelid. Lower tip of 7th proximal pterygiophore of 1st dorsal fin directed backward. Lateral squamation on caudal fin unbranched (Ref. 40970).
Body shape (shape guide): fusiform / normal.
Found in shallow, turbid waters coastal waters, estuaries, mangrove creeks, and mangrove-lined rivers (Ref. 57343), over sandbanks and mud substrates (Ref. 6390). Usually forms loose schools, although larger fish are more often observed in pairs or singly (Ref. 6390). Feeds on prawns and fish. Protandrous hermaphrodites.
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
King threadfin between 70 cm and 100 cm FL may be transitional hermaphrodites (they possess mature male and immature female reproductive tissue, and function as males (Ref. 28736)). However, most king threadfin less than 80 cm FL are males and most more than 95 cm FL are females (Ref. 28737). Transitional king threadfin are most often found in the months of June, July, August and September (Ref. 6390).
There is little information on the larvae, although nursery areas are known to be inshore, shallow and of low salinity (Ref. 6390).
Motomura, H., 2004. Threadfins of the world (Family Polynemidae). An annotated and illustrated catalogue of polynemid species known to date. FAO Spec. Cat. Fish. Purp. Rome: FAO. 3:117 p. (Ref. 57343)
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 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00692 (0.00315 - 0.01517), b=3.10 (2.92 - 3.28), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245). |
栄養段階 (参照 69278) |
4.0 ±0.4 se; based on diet studies. |
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Generation time |
7.3 ( na - na) years. Estimated as median ln(3)/K based on 1 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 (tmax=20). |
漁業の脆弱性 (Ref. 59153) |
High to very high vulnerability (66 of 100). 🛈 |
価格帯 (Ref. 80766) |
Very high.
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