Zoological Studies

Vol. 46 No. 1, 2007

Sexual Differences in the Spawning Sounds of the Japanese Croaker, Argyrosomus japonicus (Sciaenidae)

Jinn-Pyng Ueng1, Bao-Quey Huang2, and Hin-Kiu Mok3,*

1Department of Aquaculture, National Penghu University, Penghu 880, Taiwan
2Department of Biological Science and Technology, China Institute of Technology, 245 Academia Rd., Sec. 3, Nankang, Taipei 115, Taiwan
3Institute of Marine Biology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan

Jinn-Pyng Ueng, Bao-Quey Huang, and Hin-Kiu Mok (2007) Sexual differences in the calls voluntarily emitted during the spawning season of the Japanese croaker (Argyrosomus japonicus) raised in tanks and ponds in the Penghu Archipelago, Taiwan, are described. Calls are composed of a train of pulses of drumming sounds and were heard primarily after dusk. The spawning-season advertisement calls of the male and female differ; females generated significantly more pulses per call, and their calls had a longer call duration, a shorter pulse period, and a lower dominant frequency than those of males. Both sexes vocalized during the actual spawning, and their activities are described herein. Possible roles of these sounds are discussed.

Key words: Fish sounds, Penghu Islands, Sound production, Spawning sounds, Sexual dimorphism.

*Correspondence: E-mail:hinkiu@mail.nsysu.edu.tw