Slender Lanternfish

Anal organs 12-13 (Ref. 39633).

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): 13 - 15; Analspines: 0; Analsoft rays: 17 - 19

Mesopelagic (Ref. 58302). High-oceanic, found between 300-700 m during the day and between 40-325 m at night with maximum abundance at 100 m. Sexually mature from about 12.3-13.8 cm (near Hawaii) (Ref. 4479). Oviparous, with planktonic eggs and larvae (Ref. 31442).

分布於世界三大洋熱帶海域。臺灣則發現於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。

體細長，側扁，後部略細。頭略大。吻短，前端突出。眼大。口大，上頜骨狹長而延伸至前鰓蓋後緣，末端略擴大；上下頜、鋤骨、腭骨均具齒帶。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13-15，後部另具一脂鰭；臀鰭基底長於背鰭基底，具軟條17-18；胸鰭細長，末端達臀鰭起點，軟條數14-15尾鰭叉形，尾鰭副鰭條堅硬而呈棘狀。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)無；鼻部腹位發光器(Vn)小而圓形；眶下位發光器(So)無；頰部發光器(Cp)無；鰓蓋位發光器(Op)2個，位於前鰓蓋後緣下方，Op1較Op2小，均在眼眶下緣縱線之下；胸鰭上方發光器(PLO)1個，與側線距離約為其本身直徑之3倍；胸鰭下方發光器(PVO)2個，PVO1在PVO2的後下方；胸部發光器(PO)5個，PO4顯著升高；腹部發光器(VO)4個，呈水平排列；腹鰭上位發光器(VLO)位於側線與胸鰭基底之間，接近側線；臀鰭上方發光器(SAO)3個，三者排列呈鈍角狀，SAO3緊臨側線；體後側位發光器(Pol)2個，在脂鰭下方，Pol2在側線上；臀鰭前部發光器(AOa)6個，幾呈水平排列；臀鰭後部發光器(AOp)6個，沿尾柄腹側排列；尾鰭前位發光器(Prc)4個，前三個淺弧形排列，Prc4則在側線末端上。尾部發光腺SUGL約具3-4個及INGL約具5-6個小覆瓦狀發光鱗。脂鰭基部前方不具發光腺。

大洋性中層巡游魚類，具日夜垂直分布習性，白天一般棲息深度可達300-700公尺左右，晚上則上游至水深40-325公尺附近處覓食，其中以100公尺間水域豐度最高，以小蝦等甲殼類為食。

Lampanyctus tenuiformis is a species of lanternfish.

Western Atlantic: 42.8°N to Brazil, including the Gulf of Mexico

High-oceanic, found between 300-700 m during the day and between 40-325 m at night with maximum abundance at 100 m.

nektonic

Known from seamounts and knolls