Year-end Sale % OFF 
Abstract
Swim bladders in sciaenid fishes function in hearing in some and sound production in almost all species. Sciaenid swim bladders vary from simple carrot-shaped to two-chambered to possessing various diverticula. Diverticula that terminate close to the ears improve hearing. Other unusual diverticula heading in a caudal direction have not been studied. The fresh-water Asian species Boesemania microlepis has an unusual swim bladder with a slightly restricted anterior region and 6 long-slender caudally-directed diverticula bilaterally. We hypothesized that these diverticula modify sound spectra. Evening advertisement calls consist of a series of multicycle tonal pulses, but the fundamental frequency and first several harmonics are missing or attenuated, and peak frequencies are high, varying between < 1–2 kHz. The fundamental frequency is reflected in the pulse repetition rate and in ripples on the frequency spectrum but not in the number of cycles within a pulse. We suggest that diverticula function as Helmholz absorbers turning the swim bladder into a high-pass filter responsible for the absence of low frequencies typically present in sciaenid calls. Further, we hypothesize that the multicycle pulses are driven by the stretched aponeuroses (flat tendons that connect the sonic muscles to the swim bladder) in this and other sciaenids.
Highlights
Swim bladders in sciaenid fishes function in hearing in some and sound production in almost all species
There are several species including Micropogonias undulatus, Micropogonias furnieri, Argyrosomus japonicus, Larimichthys crocea, and Pogonias cromis[12,16,17,18,19] in which both sexes possess sonic muscles muscles are larger in male Atlantic croaker[12]
Female sound production in M. furnieri and Pogonias cromis has been evoked by holding or chasing them[18,19], and male and female Japanese croaker Argyrosomus japonicus and meagre Argyrosomus regius produce sounds during the mating s eason[3,20]
Summary
Swim bladders in sciaenid fishes function in hearing in some and sound production in almost all species. The fresh-water Asian species Boesemania microlepis has an unusual swim bladder with a slightly restricted anterior region and 6 long-slender caudally-directed diverticula bilaterally. We hypothesized that these diverticula modify sound spectra. Boesemania microlepis (Boeseman croaker or smallscale croaker), a highly desirable food fish, can grow to over 1 m and weigh 6 kg[21,22] It is the only described freshwater sciaenid in the Indo-west Pacific a rea[1] and one of the few freshwater sciaenid species found outside of the A mericas[23,24]. According to an unpublished report by Borsani quoted by B aird[22], B. microlepis’ sounds last about 100 ms and include energy to 6 kHz with a peak frequency of Scientific Reports | (2020) 10:18619
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
