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New bioacoustic article in Environ. Biol. Fishes

Subject: New bioacoustic article in Environ. Biol. Fishes
From: Sonja Amoser <>
Date: Mon, 9 May 2011 10:16:44 +0200
Anne-Laure Groison, Olav S. Kjesbu & Marc Suquet (2011): Sexual dimorphism of 
drumming muscles in European hake (Merluccius merluccius). Environ. Biol. 
Fishes 91 (1), 7-13.

Abstract: Dissections of mature and non-mature European hake males and females 
(N = 142) collected in waters off the western coast of Norway and in the Bay of 
Biscay (France) in 2004–2006 demonstrate for the first time that this gadoid 
species contains drumming muscles. There were differences in drumming muscles 
weight with body length, sex and maturity stage. This study shows that the 
difference between females and males is primarily manifested during the 
spawning season, seen both in the French and Norwegian samples. For the mature 
females the drumming muscles dry weight increases only slightly, if at all, 
with increase in total length. For mature males there is a corresponding rapid 
increase. There does not seem to be any consistent difference between the 
average dry weight of the drumming muscles in immature male and immature and 
mature female hake of the same length, tested on the Norwegian samples. Our 
results suggest that male hake, like the males of other gadoids studied, may 
produce sounds in the context of spawning.

For reprints please contact Anne-Laure Groison (email: 

Daniel E. Holt & Carol E. Johnston (2011): Hearing sensitivity in two black 
bass species using the auditory brainstem response approach. Environ. Biol. 
Fishes 91 (1), 121-126.

Abstract: Recently, several bioacoustic studies have focused on the red eye 
bass (Micropterus coosae). One of these studies documented sound production, 
while the other played back sounds produced by prey items in order to determine 
their attractiveness to M. coosae. Surprisingly, the hearing ability of fishes 
in the genus Micropterus has received very little attention. The need for 
audiograms describing hearing in Micropterus is apparent. This study utilized 
the auditory brainstem response (ABR) approach to determine hearing sensitivity 
in terms of both sound pressure level (SPL) and particle acceleration in two 
black bass species, the red eye bass (M. coosae) and the Alabama bass (M. 
henshalli). Audiograms produced in this study expressed in both SPL and 
particle acceleration showed a positive relationship between hearing threshold 
and frequency. Micropterus coosae was most sensitive to frequencies that 
overlap with the peak frequencies of their vocalizations, and the vocalizations 
of a prey species, Cyprinella trichroistia. Bass hearing sensitivities at lower 
frequencies, measured in terms of particle acceleration, were similar to 
several sciaenid species.

For reprints please contact D. E. Holt (email: 

Kind regards


Dr. Sonja Amoser
Steinrieglstraße 286
3400 Weidlingbach

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