Lutkens Lanternfish

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.

Dorsal spines (total): 0; Dorsal soft rays (total): 15 - 17; Analspines: 0; Analsoft rays: 14 - 16

Oceanic species (Ref. 4066). Found between 375-750 m during the day and between 40-325 m at night (Ref. 4479). Piscivorous (Ref. 51328).

Oceanic species (Ref. 4066). Found between 375-750 m during the day and between 40-325 m at night (Ref. 4479).

Diaphus luetkeni

This tropical species (Backus et al., 1977) is poorly represented in the Ocean Acre collections. Three fish, 20–37 mm, were taken: one in July and two in September. It is a moderately large species, maturing at about 42 mm and growing to about 60 mm (Nafpaktitis, 1968). One specimen was taken at night in late summer at 90 m in a discrete-depth tow.

分布於世界三大洋熱帶及亞熱帶海域。臺灣則發現於西南部、東部及東沙群島等周邊水域。

一般以底拖網捕獲，不具食用經濟價值，通常做為下雜魚用。

體延長，側扁，後部略細。頭中等大。吻短，鈍圓。眼大。口大，上頜骨狹長而延伸至前鰓蓋後緣，末端不擴大；上下頜、鋤骨、腭骨均具齒帶，上下頜內側齒延長。體被大而薄圓鱗，易脫落；側線平直。背鰭單一，位於體中部，具軟條15-17，後部另具一脂鰭；臀鰭基底略等於背鰭基底，具軟條14-15；尾鰭叉形，尾鰭副鰭條柔軟。各部位之發光器位置於下：眶前發光器(Ant)無；鼻部背位發光器(Dn)小，中央凹陷呈杯型，在鼻器後背方；鼻部腹位發光器(Vn)位於眼之腹緣，向後延伸不及眼後緣，前端不與Dn相連，背緣則具4-5個小突起；眶下位發光器(So)無；鰓蓋位發光器(Op)2個，位於前鰓蓋後緣下方，Op1明顯較Op2小，均在眼眶下緣縱線之下；鰓被架位發光器(Br)3個；胸鰭上方發光器(PLO)，距側線比距胸鰭基部遠，其下方有一中等大的發光鱗；胸鰭下方發光器(PVO)2個，兩者與PO1成一斜線；胸部發光器(PO)5個，PO1與PO2的距離為PO列中最大，PO4位置昇高；腹部發光器(VO)5個，VO3位置最高；腹鰭上位發光器(VLO)位於腹鰭和側線之間，較接近側線；臀鰭上方發光器(SAO)3個，三者排列呈斜線狀，SAO3距側線為其直徑1.5倍處；體後側位發光器(Pol)1個，在脂鰭下方，距側線為其直徑1.5倍處；臀鰭前部發光器(AOa)6個，AOa1位置昇高，但不超過SAO2，AOa6亦昇高，六者排列呈淺弧形；臀鰭後部發光器(AOp)5-6個，沿尾柄腹側水平狀排列；尾鰭前位發光器(Prc)4個，四個依次昇高呈半弧形排列，Prc4在側線下方約發光器直徑的2倍處。尾部發光腺無。

大洋性中、底層巡游魚類，具日夜垂直分布習性，白天一般棲息於375-750公尺以上，晚上則上游至水深40-325公尺附近處覓食，以小蝦等甲殼類為食。

Diaphus luetkeni, Luetken's lanternfish, is a species of lanternfish found worldwide.

Atlantic: in tropical waters with extensions into higher latitudes in western boundary currents as far north as 40.45°N

Found at depths of 40- 750 m.

nektonic

Known from seamounts and knolls