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The present investigation is carried to study the acoustic signatures of commercial fish Snapper, belonging to the family Lutjanidae (order Perciformes) which has about 105 species. The reason for considering Lutjanidae family is because they are found, often in abundance, in shallow waters throughout the tropics and they are valuable and well-regarded fishes. Since there is no previous study about the acoustic signature of snapper species, it is decided to carry out the analysis of acoustic signature of some species in Lutjanidae family and this study will be useful as reference for those who are in the field of underwater bioacoustics in future. The species of Lutjanidae family considered for this study include Mutton snapper (Lutjanus analis), Schoolmaster snapper (Lutjanus apodus), Lane snapper (Lutjanus synagris), Grey snapper (Lutjanus griseus), and Dog snapper (Lutjanus jocu). The flesh of Dog snapper of the Atlantic, is contaminated with toxins originally produced by dinoflagellates such as Gambierdiscus toxicus that cause ciguatera, a form of poisoning. The source of the sound files of these species are taken from www.fishbase.org. In this study, two different cases are considered: (i) acoustic signatures with background noise and (ii) acoustic signatures without background noise. The enhancement of acoustic signatures for both cases has been done with short time fourier transform (STFT), logical applications and inverse STFT in order to clarify the time duration of each calls of different marine species and find any variation among each species type belonging to Lutjanidae family. The type of sound produced by Lutjanidae family are thumps, knocks and growls. From the results of spectrogram plots, it is observed that the frequency of the acoustic signatures of all species are within the range of 50 to 2500 Hz approximately. The analysis of the nature of the sound recorded will be able to provide insight into the snapper fish communities living in the sea, which would be useful in easy identification of species from its acoustic signatures and this will lead to successful fisheries management.
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