VIIRS boat detection (VBD) product-based night time fishing vessels observation in the Arabian Sea and Bay of Bengal Sub-regions

Sarangi, R. K.; Jaiganesh, S.

doi:10.1080/10106049.2021.1878290

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…Since light-luring squid fisheries are characterized by their use of strong light at night, sensitive optical satellite sensors such as VIIRS can capture the activities of squid fisheries that do not transmit AIS. VIIRS has been used to investigate light-luring fishing (10,(102)(103)(104)(105)(106)(107).…”

Section: Viirs Boat Detection Analysismentioning

confidence: 99%

Fishing through the cracks: The unregulated nature of global squid fisheries

et al. 2023

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While most research has focused on the legality of global industrial fishing, unregulated fishing has largely escaped scrutiny. Here, we evaluate the unregulated nature of global squid fisheries using AIS data and nighttime imagery of the globalized fleet of light-luring squid vessels. We find that this fishery is extensive, fishing 149,000 to 251,000 vessel days annually, and that effort increased 68% over the study period 2017–2020. Most vessels are highly mobile and fish in multiple regions, largely (86%) in unregulated areas. While scientists and policymakers express concerns over the declining abundance of squid stocks globally and regionally, we find a net increase in vessels fishing squid globally and spatial expansion of effort to novel areas. Since fishing effort is static in areas with increasing management, and rising in unmanaged areas, we suggest actors may take advantage of fragmented regulations to maximize resource extraction. Our findings highlight a profitable, but largely unregulated fishery, with strong potential for improved management.

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Section: Viirs Boat Detection Analysismentioning

confidence: 99%

Fishing through the cracks: The unregulated nature of global squid fisheries

et al. 2023

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“…The VBD data are generated by the Earth Observation Group (EOG) and serve the purpose of vessel localization through the identification of bright spots within VIIRS/DNB images. These data are widely employed in fisheries management across various countries (e.g., Indonesia, Philippines, and Malaysia) and used in many publications [30,31]. Notably, the latest VBD data become available only after a 45-day delay.…”

Section: Auxiliary Datamentioning

confidence: 99%

Night-Time Vessel Detection Based on Enhanced Dense Nested Attention Network

Zuo,

Zhou,

Meng

et al. 2024

Remote Sensing

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Efficient night-time vessel detection is of significant importance for maritime traffic management, fishery activity monitoring, and environmental protection. With the advancement in object-detection approaches, the method of night-time vessel detection has gradually shifted from traditional threshold segmentation to deep learning that balances efficiency and accuracy. However, the restricted spatial resolution of night-time light (NTL) remote sensing data (e.g., VIIRS/DNB images) results in fewer discernible features and insufficient training performance when detecting vessels that are considered small targets. To address this, we establish an Enhanced Dense Nested-Attention Network (DNA-net) to improve the detection of small vessel targets under low-light conditions. This approach effectively integrates the original VIIRS/DNB, spike median index (SMI), and spike height index (SHI) images to maintain deep-level features and enhance feature extraction. On this basis, we performed vessel detection based on the Enhanced DNA-net using VIIRS/DNB images of the Japan Sea, the South China Sea, and the Java Sea. It is noteworthy that the VIIRS Boat Detection (VBD) observations and the Automatic Identification System (AIS) data were cross-matched as the actual status of the vessels (VBD-AIS). The results show that the proposed Enhanced DNA-net achieves significant improvements in the evaluation metrics (e.g., IOU, Pd, Fa, and MPD) compared to the original DNA-net, achieving performance of 87.81%, 96.72%, 5.42%, and 0.36 Wpx, respectively. Meanwhile, we validated the detection performance of Enhanced DNA-net and strong VBD detection against VBD-AIS, showing that the Enhanced DNA-net achieves 1% better accuracy than strong VBD detection.

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“…The spatiotemporal seasonal variation of the VBD data in the contrasting seasons (NWM and SEM) in 2015 is presented in . The movement of VBD is influenced by several factors, including the availability of sufficient food, oceanographic parameters suitable for small pelagic fish species, and favorable weather conditions in fishing operations [35].…”

Section: Spasio-temporal Variation Of Vbdmentioning

confidence: 99%

Shelf oceanography and small pelagic fishes in the Java Sea

Apriansyah,

Atmadipoera,

Nugroho

et al. 2024

E3S Web Conf.

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The optimization of small pelagic fisheries in the Java Sea could be enhanced by providing oceanographic information for analysis and determining potential fishing grounds. This study aims to investigate shelf oceanographic factors influencing small pelagic fisheries using multidatasets of sea surface temperature and surface salinity CROCO ocean model output (2010 – 2020), distribution of light-fishing vessel position of VIIRS satellite, and small pelagic fish catches landing data (round scads Decapterus spp. and the spotted sardinella Amblygaster sirm) at Pekalongan Fishing Port, Central Java. The results showed that the peak of fishing season for the spotted sardinella occurs during northwest monsoon, in which the eastward monsoon current and Sunda shelf throughflow brings fresher (±32.4 psu) and warmer (±28.5 oC) water into the Java Sea. In contrast, the peak of fishing season for round scads. is associated with saltier (>33.0 psu) and cooler (<28.5 °C) water supplied by the westward monsoon current and Makassar ITF during the southeast monsoon. Alternating intensification of monsoonal current along the northern Java and the southern Kalimantan coast during different monsoon periods is associated with a higher abundance of neritic and oceanic small pelagic fishes, respectively.

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VIIRS boat detection (VBD) product-based night time fishing vessels observation in the Arabian Sea and Bay of Bengal Sub-regions

Cited by 10 publications

References 13 publications

Fishing through the cracks: The unregulated nature of global squid fisheries

Fishing through the cracks: The unregulated nature of global squid fisheries

Night-Time Vessel Detection Based on Enhanced Dense Nested Attention Network

Shelf oceanography and small pelagic fishes in the Java Sea

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