is caught as one of the main by-catches by deep-sea shrimp trawl. This species plays an important role in maintaining the stability and diversity of ecosystems in the deep sea and continental slopes. Based on samples collected by bottom-water shrimp trawl and mid-water trawl in the continental slope of the northern South China Sea in June and August 2015 and March 2017, the biological parameters of viz., growth, reproduction, and feeding habit, important in terms of fishery, were investigated. Body length ranged from 71 mm to 172 mm, with an average of 118 mm; body weight varied from 5.25 g to 66.20 g, and the mean weight was 26.26 g. The distribution of body length and weight presented significant differences (ANOVA, <0.01) between females and males. Relationship between body length and weight was 2=0.9241, L^2.6883(=558) for the males. The sex ratio was 1:1.76 (female:male), and obviously, there were more males than females. Gonad samples of appeared mainly to be at stage Ⅱ; mature fishes were observed during the investigation, indicating March, June, and August to be the spawning months for in the continental slope of the northern South China Sea. The body length of the female individuals at 50% maturity was estimated to be 145.0 mm. The feeding grades of were mainly in 1 and 2 grades, and this species mainly fed on cephalopods such as , and preyed on small-size mesopelagic fish including , and crustaceans (e.g. mainly live in the bottom of the sea, and generally do not perform normal diel vertical migrations; exceptions include a few immature individuals. is a large species of lantern fish, which has important ecological and economic value in the continental shelf and slope ecosystems, and investigations into their biology and ecology should be further strengthened in the future.