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Procambarus clarkii is one of the freshwater lobsters which has its own characteristics. Those characteristics used to identify Procambarus clarkii in nature. One of those characteristics is the sound which can be determined using the bioacoustic method. This research uses the bioacoustics method to obtain the sound characteristics from Procambarus clarkii considering this species is invasive in Indonesia. Sound characteristic of this species are obtained by processing sound data into FFT value. The results of processing sound data from recording for three days show that Procambarus clarkii produces snap sound with an average frequency range from 0.3-0.4 kHz.

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Research on the distribution of fish and plankton in waters that are equipped with environmental parameters is needed to obtain maximum results and increase accuracy also it provides comprehensive information. The research, which was conducted in Humbold Bay, aimed to map the fish and plankton distribution data both vertically and horizontally and combine it with environmental parameters in the bay. Fish and plankton’s data was the volume backscattering strength (Sv) value obtained using the SIMRAD EK-15 device while environmental parameter data, such as temperature, salinity, and chlorophyll obtained from marine.copernicus.eu which processed in the 5-80 m depth range. The results showed that Humbold Bay had the highest average surface temperature distribution was 30 °C, with the highest average salinity from 35.89 ppt and the highest average chlorophyll value from 0.3859 mg/m3. The horizontal distribution of plankton had an average SV value of -76.63 dB, while the fish was -56.00 dB that evenly distributed. Vertically, the Sv of plankton decreased with increasing depth as well as the Sv of fish which its’ also did not have a distribution pattern in certain environmental parameters.