en Stock assessment Stock assessment پژوهشي Orginal research papers Reproduction biology and feeding habits of black mouth croaker, <em>Atrobucca nibe</em>, was investigated monthly from September 2013 to August 2014 in the Oman Sea. The specimens were collected by bottom trawl in the Northwest of Oman Sea. A total of 637 fish specimens examined, 284 males and 353 females were sexed. The average sex ratio was F: M= 1.24:1, showing dominance of females over the males. Spawning season of <em>A. nibe</em> was mostly observed in June and October but spawning might be occurred in all year long . The mean absolute fecundity was calculated 97008&plusmn;55553 eggs, with a moderate linear relationship between absolute fecundity and total length (Fecundity= 10802TL-280712, R²=0.7624). The mean length at first sexual maturity (Lm50 %) was 35 cm for females. <em>A. nibe</em> is an abstemious feeder according to the high vacuity index (VI=86.5&plusmn;16.8 %). Skinny cheek lanternfish (65%), Japanese threadfin bream (13%) and deep-sea shrimps (11%) were the frequent food items of this species. Results showed that&nbsp; bony fishes were consumed by all size-classes, skinny cheek lanternfish (42.1%) and Japanese threadfin bream (79.4%) were more pronounced in size-class of 34-38 cm, and also &nbsp;crustacean were more frequent (29%) in 22-26 cm size classes. Atrobucca nibe, Reproduction, Feeding habits, Lanternfish, Oman Sea 901 917 http://jifro.ir/browse.php?a_code=A-10-3673-1&slc_lang=en&sid=1 A. Salarpouri salarpouri@gmail.com 100319475328460040353 100319475328460040353 Yes Persian Gulf and Oman Sea Ecological Research Institute, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran T. Valinassab t_valinassab@yahoo.com 100319475328460040354 100319475328460040354 No Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran S. Behzadi s_behzady@yahoo.com 100319475328460040355 100319475328460040355 No Persian Gulf and Oman Sea Ecological Research Institute, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran F. Kaymaram farhadkaymaram@gmail.com 100319475328460040356 100319475328460040356 No Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran M. Darvishi m.darvishi70@yahoo.com 100319475328460040357 100319475328460040357 No Persian Gulf and Oman Sea Ecological Research Institute, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran R. Dehghani rdehghany@yahoo.com 100319475328460040358 100319475328460040358 No Persian Gulf and Oman Sea Ecological Research Institute, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran