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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); luparensis: The specific name luparensis is based on the Batang Lupar River in reference to the holotype locality. Local name of this species is Gemian.
محیط زیست: محیط زیست / منطقه آب و هوایی / تغييرات عمق / محدوده توزیع
بوم شناسي
; آب شيرين سطح زی; تغييرات عمق 3 - 5 m (Ref. 83753). Tropical; 2°N - 1°N, 111°E - 112°E
Asia: Malaysia, Borneo. Currently known only from the mouth of the Batang Lupar River, Borneo, Malaysia (Ref. 83753).
اندازه / وزن / سن
بلوغ: Lm ? range ? - ? cm
Max length : 72.0 cm SL جنس نر / بدون خواص جنسي; (Ref. 83753)
توصيف مختصر
كليدهاي شناسايي | ريخت شناسي | ريخت ستجي بوسيله انداره گيري
خارهاي باله پشتي (کل) : 9; شعاع نرم باله پشتي (کل) : 13; خارهاي باله مخرجي: 3; شعاع نرم باله مخرجي: 11. A species of Polydactylus that differs from all of its congeners by the following combination of characters: 8 dorsal-fin spines, first spine tiny, second spine very strong (its width more than 5 times of width of remaining spines); 13 second dorsal-fin soft rays; 11 anal-fin soft rays; 12 pectoral-fin rays, its length 22–24% (mean 23%) of SL, posterior tip not reaching a vertical through posterior tip of depressed pelvic fin; 6 pectoral filaments, fourth or fifth filament longest, its length 77–85% (mean 81%) of SL, posterior tip extending slightly beyond caudal-fin base; pored lateral-lined scales 67–75 (mean 71); lateral line unbranched, extending onto upper end of lower caudal-fin lobe; 6 scale rows above lateral line, 8 below; 14 gill rakers on upper limb, 18 on lower limb, 32 in total; occipital profile concave; posterior margin of maxilla extending considerably beyond a vertical through posterior margin of adipose eyelid; depth of posterior margin of maxilla 4–5% (mean 5%) of SL, greater than orbit diameter; well-developed swimbladder present; basal half of third to sixth pectoral filament white, becoming black distally. Polydactylus luparensis can be easily distinguished from all Indo-Pacific congeners by having the black distal half of the third to sixth pectoral filaments (whitish in the latter). Only two other taxa, Polynemus melanochir dulcis Motomura & Sabaj, 2002 and P. melanochir melanochir Valenciennes in Cuvier & Valenciennes, 1831, in the family Polynemidae have the black pectoral filaments (Motomura & Sabaj, 2002; Motomura, 2004b) (Ref. 83753).
Inhabiting turbid brackish water. The species is abundant in the river mouth especially from June to August and mainly caught by gill nets. Juveniles have also been observed in the same place (local fishermen, pers. comm.) (Ref. 83753).
چرخه زندگی و رفتار جفتگیری
بلوغ | تولید مثل | تخم ریزی | تخم ها | باروری | توزاد ( لارو)
Lim, P.K.A., H. Motomura and A.C. Gambang, 2010. Polydactylus luparensis, a new species of threadfin (Perciformes: Polynemidae) from the Batang Lupar River, Sarawak, Borneo, Malaysia. Zootaxa 2405:63-68. (Ref. 83753)
وضعيت در فهرست قرمز IUCN (Ref. 130435: Version 2025-2 (Global))
خطر برای انسان ها
Harmless
استفاده انسانی
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
تخمینها بر اساس مدلها
شاخص تنوع فیلوژنتیکی (مرجع
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00537 (0.00259 - 0.01116), b=3.07 (2.88 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
سطح تروفیک (مرجع
69278): 3.8 ±0.5 se; based on size and trophs of closest relatives
جهندگی (مرجع
120179): متوسط, كمينه زمان لازم براي دو برابر شدن جمعيت 4/1 – 4/4 سال (Preliminary K or Fecundity.).
آسیبپذیری ماهیگیری (Ref.
59153): High vulnerability (55 of 100).
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