浪人鰺 Caranx ignobilis

浪人鰺 Caranx ignobilis

中文俗名:

牛港鰺、牛港瓜仔、牛公瓜仔、流氓瓜仔、牛港過。

 

英文俗名:

White ulua; Yellowfin jack; Yellow-fin trevally; Trevally; Big-headed jack; Black ulua; Giant trevally; Goyan fish; Giant kingfish; Jack; Lowly trevally.

 

形態特徵:

體呈卵圓形，側扁而高，隨著成長，身體逐漸向後延長。頭背部強度彎曲，頭腹部則幾乎呈直線。脂性眼瞼普通發達，前部達眼之前緣，後部達瞳孔後緣，留下略呈半圓的縫隙。吻鈍。上頜末端延伸至瞳孔後緣。鰓耙數(含瘤狀鰓耙)20-24。體被圓鱗，胸部僅於腹鰭基部前方裸露無鱗，除了腹鰭基部前方有一小區域被鱗。

側線前部彎曲大，直走部始於第二背鰭第6-7軟條之下方，直走部幾全為稜鱗。第二背鰭與臀鰭同形，前方鰭條呈彎月形，不延長為絲狀。體背藍綠色，腹部銀白色。各鰭淡色至淡黃色。鰓蓋後緣不具任何黑斑，體側亦無任何斑紋。

 

棲所生態:

近沿海洄游性魚類。成魚多單獨棲息於具清澈水質的瀉湖或向海的礁區； 幼魚常出現於河口區域。主要在夜晚覓食，以甲殼類如螃蟹類，龍蝦類及魚類為對象。

 

地理分布:

廣泛分布於印度-西太平洋之熱帶及亞熱帶海域，西起非洲東岸，東至夏威夷群島，北自日本南部，南迄澳洲北部海域。臺灣各沿岸經常可見其蹤跡。

 

外觀相片(Photo-Trachinotus blochii):

 

 

Scientific Name:

Caranx ignobilis

Common Name:

White ulua; Yellowfin jack; Yellow-fin trevally; Trevally; Big-headed jack; Black ulua; Giant trevally; Goyan fish; Giant kingfish; Jack; Lowly trevally.

 

Characteristic:

D. VIII, I+19-20; A. II, I+15-16; P. i+19-20; G.R. 5-6+16-17; CLS. 58-64; SLS. 0-3 scales, 30-35 scutes; vertebrate 10+14. Breast ventrally naked with a small patch of minute scales. The anterior lateral line strongly curved, becoming straight below the 6-7th ray of the second dorsal fin. Adults with head and body silvery grey to black above, usually paler below; fins usually uniformly grey to black, except leading edge and tips of dorsal- and anal-fin lobes paler; no dark spot on upper margin of opercle; mature males usually darker than females, sometimes head and fins completely black; juveniles and young adults generally with more silvery bodies and paler fins, fish from turbid coastal waters often with yellow fins, the anal fin usually brightest.

 

Habitats:

Adults occur singly and inhabit clear lagoon and seaward reefs. Juveniles found in estuaries. Feed on crustaceans and fishes at night. Large individuals may be ciguatoxic. Spawn on shallow seaward reefs and offshore banks. 

 

Distribution:

Broadly distributed in tropical and subtropical waters of Indo-Pacific. It is frequently found in all Taiwanese waters.