Results 51 to 60 of about 132,546 (205)

Automated counting of fish in moving diver‐operated videos (DOV) for biodiversity assessments

Methods in Ecology and Evolution, EarlyView.
Abstract Underwater video transects are crucial to assess marine biodiversity and biomass. Counting fish in these videos is labour‐ and time‐intensive and operator‐dependent. Automating this step would create non‐biased biodiversity data and decouple the data collection campaign from any field constraints.
Kilian Bürgi, Rémy Sun, Charles Bouveyron, Diane Lingrand, Benoit Dérijard, Frédéric Precioso, Cécile Sabourault   +6 more
wiley   +1 more source

Hull Design for ROV with Four Thrusters (X4-ROV) [PDF]

, 2016
In this research, an X4-ROV consisting of four thrusters is design to develop a small ROV which does not have any rudders for an observation class unmanned underwater vehicle system. Each thruster is arranged at equal intervals to the same plane, and the
Khairil Ashraff, Ab Rahim, Maziyah, Mat Noh, Nurfadzillah, Harun, Zainah, Md. Zain   +3 more
core  

Global Analysis of Shallow Underwater Fish Observation Research: 70 Years of Progress, Persistent Geographic Biases and a Path Forward

Fish and Fisheries, EarlyView.
ABSTRACT Marine ecosystems are increasingly threatened by overfishing, pollution, coastal development and climate change, underscoring the need for long‐term, representative information on key fish populations and habitats to inform management and policy.
Angus John van Wyk, Rick D. Stuart‐Smith, Jordan S. Goetze, Eva Maire, Elodie Heyns‐Veale, Kaylee Smit, Tim J. Langlois, M. Aaron MacNeil, Alejandro Pérez‐Matus, Amanda T. Lombard, Ana Carolina, Christy Semmens, Ella Clausius, Fernanda A. Rolim, Jonathan S. Lefcheck, Jacquomo Monk, Joanna K. Schmid, Katherine Tattersall, Laura Ghigliotti, Luther Adams, Melita Samoilys, Pascale Chabanet, Paul Whomersley, Peter Walsh, Reiji Masuda, Russell Brainard, Anthony Bernard   +26 more
wiley   +1 more source

Design and Construction of a ROV (Remotely Operated Vehicule) Submarine USFQ

ACI Avances en Ciencias e Ingenierías, 2014
In the present work, a motorized remotely operated underwater vehicle (ROV) was developed. The platform is capable of carrying navigation sensors, vision and control systems.
Nicolás Soria, Daniel Cabrera, Paulo Guerra   +2 more
doaj   +1 more source

Assessment of fish populations and habitat on Oculina Bank, a deep-sea coral marine protected area off eastern Florida [PDF]

, 2009
A portion of the Oculina Bank located off eastern Florida is a marine protected area (MPA) preserved for its dense populations of the ivory tree coral (Oculina varicosa), which provides important habitat for fish.
Harter , Stacey L., Reed, John K., Ribera, Marta M., Shepard, Andrew N.   +3 more
core  

Hidden partnerships in the dark: Cold‐water coral–fish associations in Fiordland, New Zealand

Journal of Fish Biology, EarlyView.
Abstract The ichthyofauna of the Fiordland ecosystems of southern Aotearoa New Zealand was documented during four remotely operating vehicle (ROV) dives between 100 and 350 m depth. A total of 26 fish species were documented within two fiord basins.
Alexander H. Knorrn, Peter Marriott, Kareen Schnabel, André Freiwald   +3 more
wiley   +1 more source

Reproductive behaviour of the ocean triggerfish Canthidermis sufflamen (Tetraodontiformes: Balistidae) in the shallow waters of the marine‐protected area of El Hierro Island (Canary Islands)

Journal of Fish Biology, EarlyView.
Abstract The abundance of Canthidermis sufflamen has increased worldwide, including around the Canary Islands, due to global ocean warming. The reproductive behaviour of this species was studied within a marine‐protected area (MPA) and its adjacent areas off the island of El Hierro (Canary Islands).
Alberto Rodríguez‐Díaz, Raül Triay‐Portella, José A. González, José G. Pajuelo   +3 more
wiley   +1 more source

Establishment of hydrodynamic model and research on motion simulation of open-frame ROV

Zhongguo Jianchuan Yanjiu
ObjectiveManeuverability is one of the most important performance characteristics of a Remotely Operated Vehicle (ROV), and is closely related to its dynamics model. To realize the precise control and maneuverability of an open-frame ROV, a dynamic model
Mengjie JIANG, Chaohe CHEN, Lianbin ZHANG, Lei TAN   +3 more
doaj   +1 more source

Light Transmission Through Arctic Sea Ice - Large-Scale Studies on Seasonality and Spatial Variability [PDF]

, 2013
Arctic sea ice has declined and become thinner and more seasonal during the last decade. One consequence of this is that the surface energy budget of the Arctic Ocean is changing.
Arndt, Stefanie, Katlein, Christian, Nicolaus, Marcel   +2 more
core  

First Strike: Description of the Events at the First Salmon Farm Affected by the 2025 Algal Bloom in Northern Norway

Journal of Fish Diseases, EarlyView.
ABSTRACT Harmful algal blooms (HABs) are a threat to fish welfare, occurring suddenly and unexpectedly causing significant consequences for fish and salmon farmers worldwide. Norwegian farmers have been facing this challenge at irregular intervals since the very beginning of the industry. This report describes the events on the first fish farm affected
Julie Seem, Mirjam Nikoline Petterson, Tore Seternes, Pål Furset Lader, Julie Christine Svendsen, Lars‐Johan Naustvoll, Lars Helge Stien   +6 more
wiley   +1 more source