Underwater Camera System to Observe Effect of Fishing Bait on Number of Caught Snow Crabs

2018 ◽  
Author(s):  
Hyeonwoo Cho ◽  
Son-Cheol Yu
Keyword(s):  
Camera System ◽  
Underwater Camera ◽  
Snow Crabs

scholarly journals Biological and physical characterization of the seabed surrounding Ascension Island from 100–1000 m

2017 ◽  
Vol 97 (4) ◽  
pp. 647-659 ◽  
Author(s):  
E.T. Nolan ◽  
D.K.A. Barnes ◽  
J. Brown ◽  
K. Downes ◽  
P. Enderlein ◽  
...  
Keyword(s):  
Cold Water ◽  
Sea Urchins ◽  
Marine Ecosystems ◽  
Carbon Accumulation ◽  
Marine Biodiversity ◽  
Density Maximum ◽  
Camera System ◽  
Entire Area ◽  
Ascension Island ◽  
Underwater Camera

Recent studies have improved our understanding of nearshore marine ecosystems surrounding Ascension Island (central Atlantic Ocean), but little is known about Ascension's benthic environment beyond its shallow coastal waters. Here, we report the first detailed physical and biological examination of the seabed surrounding Ascension Island at 100–1000 m depth. Multibeam swath data were used to map fine scale bathymetry and derive seabed slope and rugosity indices for the entire area. Water temperature and salinity profiles were obtained from five Conductivity, Temperature, Depth (CTD) deployments, revealing a spatially consistent thermocline at 80 m depth. A camera lander (Shelf Underwater Camera System; SUCS) provided nearly 400 images from 21 sites (100 m transects) at depths of 110–1020 m, showing high variability in the structure of benthic habitats and biological communities. These surveys revealed a total of 95 faunal morphotypes (mean richness >14 per site), complemented by 213 voucher specimens constituting 60 morphotypes collected from seven targeted Agassiz trawl (AGT) deployments. While total faunal density (maximum >300 m−2 at 480 m depth) increased with rugosity, characteristic shifts in multivariate assemblage structure were driven by depth and substratum type. Shallow assemblages (~100 m) were dominated by black coral (Antipatharia sp.) on rocky substrata, cup corals (Caryophyllia sp.) and sea urchins (Cidaris sp.) were abundant on fine sediment at intermediate depths (250–500 m), and shrimps (Nematocarcinus spp.) were common at greater depths (>500 m). Other ubiquitous taxa included serpulid and sabellid polychaetes and brittle stars (Ophiocantha sp.). Cold-water corals (Lophelia cf. pertusa), indicative of Vulnerable Marine Ecosystems (VMEs) and representing substantial benthic carbon accumulation, occurred in particularly dense aggregations at <350 m but were encountered as deep as 1020 m. In addition to enhancing marine biodiversity records at this locality, this study provides critical baseline data to support the future management of Ascension's marine environment.

scholarly journals The precision calibration of depth and resolution for multibeam sonar in anechoic pool in the laboratory

2019 ◽  
Vol 283 ◽  
pp. 08006
Author(s):  
Bei Shi ◽  
Yongwei Liu ◽  
Dejiang Shang ◽  
Xianwen Zhao ◽  
Yalin Li
Keyword(s):  
Acoustic Waves ◽  
Good Precision ◽  
Camera System ◽  
Multibeam Sonar ◽  
Steel Pipes ◽  
Resolution Capability ◽  
Set Up ◽  
Underwater Camera ◽  
Scanning Mechanism ◽  
Key Parameter

The multibeam sonar is an important device for underwater survey, of which the measurement precision is a key parameter. We had designed an equipment to calibrate the depth and resolution precision for multibeam sonar in the anechoic pool in the laboratory. The main frame of the equipment is built up by circular and square steel pipes. The absorption materials are laid outside of the pipes, so that the multibeam sonar cannot receive the strong enough reflected acoustic waves from the boundary. We had made a two-dimensional scanning mechanism, which ascends and descends freely for evaluating the depth precision of multibeam sonar. The minimum precision of the depth is 0.1 mm. We had set up a series of iron blocks with the dimension of 0.1,0.2,0.4,0.6,0.8, and 1.0 square meters, respectively, as the standard objects for evaluating the resolution capability of multibeam sonar. In addition, we had placed an underwater camera system to record the iron blocks in time. The result of iron blocks measured by the calibrated multibeam sonar is compared to that recorded by the camera. Because the wavelength of acoustics is larger than that of optics, therefore, good precision of the resolution can be gotten.

A new towed underwater camera system for wide-range benthic surveys

1975 ◽  
Vol 33 (1) ◽  
pp. 75-84 ◽  
Author(s):  
R. Machan ◽  
K. Fedra
Keyword(s):  
Camera System ◽  
Wide Range ◽  
Underwater Camera

A new drifting underwater camera system for observing spawning Japanese eels in the epipelagic zone along the West Mariana Ridge

2015 ◽  
Vol 81 (2) ◽  
pp. 235-246 ◽  
Author(s):  
Tatsuhiro Fukuba ◽  
Tetsuya Miwa ◽  
Shun Watanabe ◽  
Noritaka Mochioka ◽  
Yoshiaki Yamada ◽  
...  
Keyword(s):  
The West ◽  
Camera System ◽  
Epipelagic Zone ◽  
Underwater Camera

Overview of a hybrid underwater camera system

2014 ◽  
Author(s):  
Philip Church ◽  
Weilin Hou ◽  
Georges Fournier ◽  
Fraser Dalgleish ◽  
Derek Butler ◽  
...  
Keyword(s):  
Camera System ◽  
Underwater Camera

scholarly journals How to build a low-cost underwater camera housing for aquatic research

FACETS ◽  
2017 ◽  
Vol 2 (1) ◽  
pp. 150-159 ◽  
Author(s):  
Jonathan A. Bergshoeff ◽  
Nicola Zargarpour ◽  
George Legge ◽  
Brett Favaro
Keyword(s):  
Aquatic Environment ◽  
Low Cost ◽  
Biological Research ◽  
High Definition ◽  
Camera System ◽  
Full List ◽  
Remote Cameras ◽  
System A ◽  
Underwater Cameras ◽  
Underwater Camera

Remote cameras are an increasingly important tool in field-based biological research. Terrestrial researchers can purchase inexpensive off-the-shelf cameras, but aquatic researchers face challenges in adopting similar systems for underwater science. Although technology allows researchers to deploy cameras in any aquatic environment, high procurement costs are often a barrier, particularly for studies that require the collection of lengthy videos. In this note, we provide a detailed guide explaining how to assemble an underwater camera system for less than $425 USD. We focus especially on the construction of the underwater housing, which is typically the most expensive component of an underwater camera system. As described, this system can record 13 h full high-definition videos in depths up to 100 m. It can be constructed and assembled with limited technical background using tools available in most workshops. The guide includes a general overview of the system, a full list of components, detailed instructions on constructing the camera housing, and suggestions on how to mount and use the camera in fieldwork. Our goal for this note is to promote the wider use of remote underwater cameras in aquatic research by making them accessible to those with limited financial means.

scholarly journals Aqua-Vision (An underwater panoramic camera with computer vision and analytics)

2022 ◽  
Vol 2161 (1) ◽  
pp. 012062
Author(s):  
Siddharth Sudhakar ◽  
Shubham Yadav ◽  
Manav Dhelia ◽  
Pranav Taysheti ◽  
Arjun Hariharan ◽  
...  
Keyword(s):  
Computer Vision ◽  
Social Media ◽  
User Experience ◽  
Mobile Application ◽  
Rotary Motion ◽  
Camera System ◽  
Substantial Advantage ◽  
Camera Module ◽  
Portable Camera ◽  
Underwater Camera

Abstract In the present social media-bound lifestyle, capturing memories and keeping them accessible is gaining a significant demand globally. For this purpose, a robust, portable camera system for recreational or commercial purposes can be of substantial advantage to society. Aqua-Vision intends to bring an affordable underwater camera system with various innovative features to the hands of consumers. The smart module consists of a waterproof gimbal camera that can be used underwater, providing a hassle-free and reliable user experience and offers rotary motion along two axes. The camera features various general modes like panorama, burst shot, and smart modes using inbuilt computer vision algorithms. The gimbal camera setup can be controlled and switched remotely between all possible modes using a mobile application. All the above features will allow the user to capture photos/videos in any possible setup and use the camera module for various applications. The advent of such innovative, convenient, and robust modules will help cater to the market demands effectively.

scholarly journals In-situ Image Analysis of Habitat Heterogeneity and Benthic Biodiversity in the Prince Gustav Channel, Eastern Antarctic Peninsula

2021 ◽  
Vol 8 ◽  
Author(s):  
Peter M. Almond ◽  
Katrin Linse ◽  
Simon Dreutter ◽  
Susie M. Grant ◽  
Huw J. Griffiths ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Habitat Heterogeneity ◽  
Environmental Changes ◽  
Marine Ecosystem ◽  
Habitat Type ◽  
Benthic Fauna ◽  
Ice Shelf ◽  
Camera System ◽  
Underwater Camera ◽  
Hard Substrates

Habitat heterogeneity is important for maintaining high levels of benthic biodiversity. The Prince Gustav Channel, on the Eastern Antarctic Peninsula, is characterized by an array of habitat types, ranging from flat, mud-dominated sheltered bays to steep and rocky exposed slopes. The channel has undergone dramatic environmental changes in recent decades, with the southern end of the channel permanently covered by the Prince Gustav Ice Shelf until it completely collapsed in 1995. Until now the marine benthic fauna of the Prince Gustav Channel has remained unstudied. A shallow underwater camera system and Agassiz trawl were deployed at different locations across the channel to collect information on habitat type and heterogeneity, benthic community composition and macrofaunal biomass. The texture of the seafloor was found to have a significant influence on the benthos, with hard substrates supporting higher abundances and diversity. Suspension and filter feeding organisms, including porifera, crinoids, and anthozoans, were strongly associated with hard substrates, with the same being true for deposit feeders, such as holothurians, and soft sediments. Habitat heterogeneity was high across the Prince Gustav Channel, particularly on a local scale, and this was significant in determining patterns of benthic composition and abundance. Other physical variables including depth and seafloor gradient played significant, interactive roles in determining composition potentially mediated through other processes. Sites that were once covered by the Prince Gustav Ice Shelf held distinct and unique communities, suggesting that the legacy of the ice shelf collapse may still be reflected in the benthos. Biomass estimations suggest that critical thresholds of vulnerable marine ecosystem indicator taxa, as defined by the Commission for the Conservation of Antarctic Marine Living Resources, have been met at multiple locations within the Prince Gustav Channel, which has implications for the future establishment of no take zones and marine protected areas within the region.

scholarly journals Annelid Fauna of the Prince Gustav Channel, a Previously Ice-Covered Seaway on the Northeastern Antarctic Peninsula

2021 ◽  
Vol 7 ◽  
Author(s):  
Regan Drennan ◽  
Thomas G. Dahlgren ◽  
Katrin Linse ◽  
Adrian G. Glover
Keyword(s):  
Antarctic Peninsula ◽  
Demographic History ◽  
Benthic Communities ◽  
Weddell Sea ◽  
Ice Shelf ◽  
Camera System ◽  
Evolutionary Origins ◽  
History Of ◽  
Dynamic Habitat ◽  
Underwater Camera

The Prince Gustav Channel is a narrow seaway located in the western Weddell Sea on the northeastern-most tip of the Antarctic Peninsula. The channel is notable for both its deep (&gt;1200 m) basins, and a dynamic glacial history that most recently includes the break-up of the Prince Gustav Ice Shelf, which covered the southern portion of the channel until its collapse in 1995. However, the channel remains mostly unsampled, with very little known about its benthic biology. We present a preliminary account of the benthic annelid fauna of the Prince Gustav Channel in addition to samples from Duse Bay, a sheltered, glacier-influenced embayment in the northwestern portion of the channel. Samples were collected using an Agassiz Trawl, targeting megafaunal and large macrofaunal sized animals at depths ranging between 200–1200 m; the seafloor and associated fauna were also documented in situ using a Shallow Underwater Camera System (SUCS). Sample sites varied in terms of depth, substrate type, and current regime, and communities were locally variable across sites in terms of richness, abundance, and both taxonomic and functional composition. The most diverse family included the motile predator/scavenger Polynoidae, with 105 individuals in at least 12 morphospecies, primarily from a single site. This study provides first insights into diverse and spatially heterogeneous benthic communities in a dynamic habitat with continuing glacial influence, filling sampling gaps in a poorly studied region of the Southern Ocean at direct risk from climate change. These specimens will also be utilized in future molecular investigations, both in terms of describing the genetic biodiversity of this site and as part of wider phylogeographic and population genetic analyses assessing the connectivity, evolutionary origins, and demographic history of annelid fauna in the region.

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