The reproductive biology of female crimson sea bream Evynnis tumifrons off the southwestern coast of Kyushu, Japan

  • Lindon Havimana
  • Jun OhtomiEmail author
  • Yasuji Masuda
  • Miguel Vazquez Archdale
Original Article Biology


Ovarian maturation, size at sexual maturity and the annual reproductive cycle of female crimson sea bream Evynnis tumifrons were studied using samples collected from April 2012 to June 2014 off the southwestern coast of Kyushu, Japan. A total of 801 ovaries were examined histologically to estimate the degree of ovarian maturation. E. tumifrons showed an asynchronous ovary signifying multiple spawning in a single reproductive season. Ovarian maturity stages were classified into six categories based on the appearance of the most advanced oocytes, post-ovulatory follicles and atretic oocytes in the ovary as follows: immature, maturing, mature, spawned, spent and resting. Females with ovaries at maturing, mature, spawned or spent stages were defined as sexually mature individuals, and the size at sexual maturity was estimated to be 179-mm fork length based on 50% maturity size. Monthly changes in the gonadosomatic index and the occurrence of mature or spawned maturity stages showed that the spawning season lasts from November to May with an intermission in March 2013. The factor responsible for this intermission was considered to be the low water temperature that occurred in the preceding month.


Condition factor Evynnis tumifrons Gonadosomatic index Ovarian maturation Sexual maturity size Spawning season 



We would like to acknowledge the tireless cooperation of the commercial fishers of the Eguchi Fishermen’s Cooperative and the students of the Fisheries Biology Lab, Faculty of Fisheries, Kagoshima University for data sampling and measurement. We would also like to express our sincere gratitude to Mr Shugo Matsuo and Ms Yuki Katsuha for their assistance in preparing the histological sections of the ovaries.


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Copyright information

© Japanese Society of Fisheries Science 2019

Authors and Affiliations

  1. 1.The United Graduate School of Agricultural SciencesKagoshima UniversityKagoshimaJapan
  2. 2.Faculty of FisheriesKagoshima UniversityKagoshimaJapan

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