Abstract
Sound production in fishes is common in marine and freshwater species, however there are still many vocal species for which sound production has not been documented. This paper is the first account of sound production in the Guardian Darter (Etheostoma oophylax). Laboratory recordings revealed that males produced several vocalizations, including single pulse knocks, multi-pulsed purrs, and tonal drums. All vocalizations were documented during agonistic and courtship encounters, including spawning. We also investigated possible correlations between call characteristics and male size. Male standard length was found to be correlated to inter-pulse interval of purrs, as well as the slope of the drum vocalizations. Determining a link between male size and acoustic characteristics could be the first step in documenting mate or male-male assessment by acoustic communication in darters.
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