A low-cost approach in acoustic monitoring of dolphin presence

Marco, Rocco De; Nardo, Francesco Di; Lucchetti, Alessandro; Virgili, Massimo; Petetta, Andrea; Petetta, Andrea; Screpanti, Laura; Bartolucci, Veronica; Scaradozzi, David

doi:10.1109/metrosea55331.2022.9950931

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Further research is also needed to understand the social behavior of dolphins in the vicinity of fishing; in this regard, modern technologies such as drones, underwater cameras and passive acoustics monitoring are now also available for a reasonable cost, and this could certainly help to understand these relationships more thoroughly [51,53]. In particular, the use of low-cost hydrophones attached to the nets during fishing [54] could also be spread to create a capillary marine detection network, in order to improve the knowledge of their behavior and thus provide more specific management and mitigation measures.…”

Section: Discussionmentioning

confidence: 99%

Fishers’ Perception on the Interaction between Dolphins and Fishing Activities in Italian and Croatian Waters

Petetta

Barone

et al. 2023

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Interactions between fishing and dolphins can be detrimental, since on one hand dolphins can be lethally entangled by nets and trawls, and on the other dolphins can predate fish caught by nets. For dolphins, this interaction can be dangerous as they can be wounded or accidentally killed; for fishers, the predation of their catch results in economic losses due to reduced quantity and/or quality of catches and damage to fishing gear. During July and November 2020, we surveyed the “dolphin–fisheries conflict” through compiling 209 fisher interviews from nine locations in Italy and Croatia. Fishers mentioned the common bottlenose dolphin (Tursiops truncatus) as the species primarily interacting with fishing, with the major issue being catch damage by predation. The interaction probability varied among gears and seasons, with some fishing activities (e.g., passive nets) more affected than others (e.g., bottom trawls), especially in terms of economic loss (1000–10,000 €/year on average). More than 70% of the fishers claimed that dolphin populations have increased over the last 10 years, in different degrees and based on different areas. Dolphin bycatch rates are generally low; however, 34.6% of respondents reported having captured at least one dolphin during their career. The fishers’ attitude towards acoustic deterrents (“pingers”) as a mitigation measure revealed that few of them were aware of these devices or were using them.

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Section: Discussionmentioning

confidence: 99%

Fishers’ Perception on the Interaction between Dolphins and Fishing Activities in Italian and Croatian Waters

Petetta

Barone

et al. 2023

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“…This study is a modular component of a wider project to develop an autonomous lowcost device for detecting the acoustic presence of cetaceans, as described in [21]. Specifically, the study focuses on the concept of a novel homemade hydrophone for acquiring underwater sounds that is capable of minimizing costs while maintaining the practicabil- Quantitatively, the PAM expert detected 11 whistles and 133 burst pulse sounds in the signal recorded by the low-cost approach.…”

Section: Discussionmentioning

confidence: 99%

“…More specifically, the hydrophone has been developed and optimized to simultaneously reduce device costs and preserve the trustworthiness of the measurement of free-ranging dolphin vocalizations. A preliminary attempt has already been proposed in [21]. That approach has been expanded in this paper, increasing the acquisition of experimental data, improving the processing of acquired signals, detailing the technical description of the hardware, and strengthening the procedure for the validation of the device and interpretation of results.…”

Section: Introductionmentioning

confidence: 99%

The Development of a Low-Cost Hydrophone for Passive Acoustic Monitoring of Dolphin’s Vocalizations

et al. 2023

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Passive acoustics are widely used to monitor the presence of dolphins in the marine environment. This study aims to introduce a low-cost and homemade approach for assembling a complete underwater microphone (i.e., the hydrophone), employing cheap and easy to obtain components. The hydrophone was assembled with two piezo disks connected in a balanced configuration and encased in a plastic container filled with plastic foam. The hydrophone’s performance was validated by direct comparison with the commercially available AS-1 hydrophone (Aquarian Hydrophones, Anacortes, U.S.) on different underwater acoustic signals: artificial acoustic signals (ramp and multitone signals) and various dolphin vocalizations (whistle, echolocation clicks, and burst pulse signals). The sensitivity of the device’s performance to changes in the emission source position was also tested. The results of the validation procedure on both artificial signals and real dolphin vocalizations showed that the significant cost savings associated with cheap technology had a minimal effect on the recording device’s performance within the frequency range of 0–35 kHz. At this stage of experimentation, the global cost of the hydrophone could be estimated at a few euros, making it extremely price competitive when compared to more expensive commercially available models. In the future, this effective and low-cost technology would allow for continuous monitoring of the presence of free-ranging dolphins, significantly lowering the total cost of autonomous monitoring systems. This would permit broadening the monitored areas and creating a network of recorders, thus improving the acquisition of data.

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Development of a high sensitivity hydrophone at a spectrum range from 0.1 Hz to 100 kHz

Motsi,

Stamou,

Angelopoulos

et al. 2024

Sensors and Actuators A: Physical

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A low-cost approach in acoustic monitoring of dolphin presence

Cited by 3 publications

References 9 publications

Fishers’ Perception on the Interaction between Dolphins and Fishing Activities in Italian and Croatian Waters

Fishers’ Perception on the Interaction between Dolphins and Fishing Activities in Italian and Croatian Waters

The Development of a Low-Cost Hydrophone for Passive Acoustic Monitoring of Dolphin’s Vocalizations

Development of a high sensitivity hydrophone at a spectrum range from 0.1 Hz to 100 kHz

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A low-cost approach in acoustic monitoring of dolphin presence

Cited by 3 publications

References 9 publications

Fishers’ Perception on the Interaction between Dolphins and Fishing Activities in Italian and Croatian Waters

Fishers’ Perception on the Interaction between Dolphins and Fishing Activities in Italian and Croatian Waters

The Development of a Low-Cost Hydrophone for Passive Acoustic Monitoring of Dolphin’s Vocalizations

Development of a high sensitivity hydrophone at a spectrum range from 0.1 Hz to 100 kHz

Contact Info

Product

Resources

About

Development of a high sensitivity hydrophone at a spectrum range from 0.1 Hz to 100 kHz