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"Detects the sound frequency range of fish, the intensity of the sound amplitude, sound fluctuations, and shape the sound patterns of the fish. Passive acoustic methods used to monitor marine mammals expressed. In general, the signal obtained from the animal record sounds is poor and difficult to determine from which directions it is produced, therefore it requires that require amplification strengthening. Bioacoustic research is needed to identifies the communication language (Acoustic communication) in mammals. Bioacoustic detect mammal produced frequency ranges of sound, amplitude intensity of sound, voice fluctuation, and form sound patterns of mammals. Studying bioacoustic is inseparable from the science of underwater acoustics, biology of mammals, and the study of mammalian behavior: Generally bioacoustic include physiology of mammals organ that produce sound, earning voice mechanism, sound characteristics of mammals, mammals sound approaching mechanism, the hearing capacity of fish, and the evolution of the auditory system, and to obtain the fequency range of each sound produced by the dolphins (mammals). Environmental conditions and parameters (salinity and temperature) will greatly affect the value of the intensity and frequently generated the target, the more extreme the environmental conditions, the lower value of the intensity and frequency generated."

"Many remote sensing applications are devoted to the coastal and ocean sector. Representative case studies are presented in the special issue Advances in Remote Sensing of Coastal and Ocean. remote sensing techniques represent a powerful tool for landslide investigation:applications are traditionally sea surface temperature, marine habitat into three main classes, although this subdivision has some limitations and borders are sometimes fuzzy in coastal and ocean. Remote sensing combined with geographic information systems. can be used as a technology tool to obtain information about the object quickly and accurately, including objects in coastal and ocean areas. Remote sensing data essentially can be used as an alternative technology in obtaining information at a cheaper cost when compared with the conventional way."

"Utilization hydroacoustic methods in recent years have become increasingly effective for estimating the abundance of marine fish, especially fish stocks, where is impossible to do with conventional methods approach. Widely hydroacoustic technology has been used to map and classify the content of the resource base of waters and benthic animals that are on the bottom, type of substrate and benthic biota. Target Strength is the most important factor in the detection and prediction of fish stocks by using hydroacoustic. The TS is a measure that can describe the ability of a target to reflect sound waves that come about it. In the propagation of sound waves, the amount of energy per second will be flowing through the unit certain area perpendicular to the direction of propagation. The amount of energy per second crossing a certain area of the unit refers to as the intensity of the wave. The system of detection and measurement of underwater involves three components, namely medium, targets, and equipment. Sonar equation is built based on the similarity or balance between the parts of the received signal, the desired called signal and the unwanted parts referred noise or noise, depending on the specific sonar functions are applied."