Basic reproductive biology of the daggertooth pike conger, Muraenesox cinereus were investigated based on the samples from August 2015 to December 2017 in Korean waters. A total of 2,328 samples was collected (1,593 females and 735 males) during the study period. The mean anal lengths (AL) were 33.5 ± 9.2 cm in females and 26.2 ± 7.3 cm in males respectively. The females were larger than males in AL (p < 0.05). Sex ratio was 2.2:1 in female to male (p < 0.05). The gonadosomatic index (GSI) varied monthly. GSI of female reached the maximum in July 2016 and June 2017 and the minimum in October 2016 and September 2017 respectively. The spawning period was from June to October. The size at sexual maturity (L50) of females was estimated at 24.9 cm in AL (63.5 cm in TL).

• 고은혜(국립수산과학원 연근해자원과) | Eun Hye KOH (Fisheries Resource Management Division, National Institute of Fisheries Science)
• 권대현(국립수산과학원 연근해자원과) | Dae-Hyeon KWON (Fisheries Resource Management Division, National Institute of Fisheries Science) Corresponding author
• 장충식(경상대학교 해양경찰시스템학과/해양산업연구소) | Choong-Sik JANG (Department of Maritime Police and Production System/Institute of Marine Industry, Gyeongsang National University)