Browsing Brage IMR by Author "Macaulay, Gavin"
Now showing items 1-14 of 14
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Accuracy of the Kirchhoff-approximation and Kirchhoff-ray-mode fish swimbladder acoustic scattering models
Macaulay, Gavin; Pena, Hector; Fässler, Sacha M.M.; Pedersen, Geir; Ona, Egil (Journal article; Peer reviewed, 2013)The acoustic backscatter from pressure release prolate spheroids and a three-dimensional representation of a fish swimbladder (Chilean jack mackerel, Trachurus symmetricus murphyi) was calculated using four target strength ... -
Akustisk fangstovervåking i not – Utfordringer og løsningsforslag til bedre metodikk
Tenningen, Maria; Øvredal, Jan Tore; Macaulay, Gavin (Rapport fra havforskningen;42-2018, Research report, 2018) -
An acoustic method to observe the distribution and behaviour of mesopelagic organisms in front of a trawl
Underwood, Melanie; García-Seoane, Eva; Klevjer, Thor A.; Macaulay, Gavin; Melle, Webjørn Raunsgård (Peer reviewed; Journal article, 2020) -
Comparisons of echo-integration performance from two different multiplexed echosounders
Macaulay, Gavin; Schoulding, Ben; Ona, Egil; Fässler, Sascha M. M. (Journal article; Peer reviewed, 2018)A time-series of acoustically derived aquatic biomass estimates relies on the acoustic equipment maintaining the same performance throughout the time-series. This is normally achieved through a regular calibration process. ... -
CRISP- Toktrapport. Testing trålutstyr og instrumentering. G. O. Sars 1.-11. mars 2015
Valdemarsen, John Willy; Øvredal, Jan Tore; Aasen, Asbjørn; Engås, Arill; Rosen, Shale; Macaulay, Gavin; Mæstad, Odd Kjartan; Sæstad, Arvid; Nedrebø, Trond; Bærhaugen, Thor; Vågstøl, Håvard; Knotten, Vidar (Rapport fra havforskningen;10-2016, Research report, 2016) -
Development of methods relevant to feedback management (FBM) for the krill fishery
Krafft, Bjørn Arne; Lowther, Andrew; Macaulay, Gavin; Chierici, Melissa; Biuw, Martin; Renner, Angelika; klevjer, tor; Øyerhamn, Rune; cardenas, cecar; makhado, arata; Reiss, Christian; Bergstad, Odd Aksel (Research report, 2018)The primary objective for this project is to develop knowledge on the marine environment essential for the implementation of a Feed-Back Management (FBM) system. In terms of FBM, Marine Protected Area (MPA) development in ... -
Diel vertical movements determine spatial interactions between cod, pelagic fish and krill on an Arctic shelf bank
Skaret, Georg; Johansen, Geir Odd; Johnsen, Espen; Fall, Johanna Jennifer Elisabeth; Fiksen, Øyvind; Englund, Gøran; Fauchald, Per; Gjøsæter, Harald; Macaulay, Gavin; Johannesen, Edda (Peer reviewed; Journal article, 2020)Predator-prey spatial interactions are essential to understand ecosystem processes like predation rates and trophic interaction strength. In marine systems, such spatial interactions are highly dynamic and difficult to ... -
Distribution and composition of mesopelagic macroplankton and micronekton in the North-east Atlantic
Garcia-Seoane, E.; Klevjer, Thor A.; Knutsen, Tor; Macaulay, Gavin; Mork, Kjell Arne; Rosen, Shale; Strand, Espen; Wienerroither, Rupert; Underwood, Melanie; Melle, Webjørn Raunsgård (Lecture, 2018) -
Experimental evidence of threat-sensitive collective avoidance responses in a large wild-caught herring school
Rieucau, Guillaume; Boswell, Kevin M.; De Robertis, Alex; Macaulay, Gavin; Handegard, Nils Olav (Peer reviewed; Journal article, 2014)Aggregation is commonly thought to improve animals’ security. Within aquatic ecosystems, group-living prey can learn about immediate threats using cues perceived directly from predators, or from collective behaviours, for ... -
Instantaneous areal population density of entire Atlantic cod and herring spawning groups and group size distribution relative to total spawning population
Makris, Nicholas C.; Godø, Olav Rune; Yi, Dong Hoon; Macaulay, Gavin; Jain, Ankita Deepak; Cho, Byunggu; Gong, Zheng; Jech, J. Michael; Ratilal, Purnima (Journal article; Peer reviewed, 2018)The wide‐area group behaviour of spawning Atlantic cod and herring is investigated. By a combination of Ocean Acoustic Waveguide Remote Sensing (OAWRS) and conventional sensing methods, first‐look images of the instantaneous ... -
Multinational large scale krill synoptic survey in CCAMLR Area 48 in 2019-survey plan and protocol for consideration by SG-ASAM 2018
Krafft, Bjørn Arne; Bergstad, Odd Aksel; Knutsen, Tor; Skaret, Georg; Macaulay, Gavin (CCAMLR;SG-ASAM-18/07, Research report, 2018)The objective for the Multinational Large-Scale Krill Synoptic Survey in CCAMLR area 48 3 in 2019 is to provide an updated estimate of the biomass of Antarctic krill (Euphausia 4 superba) used in models to estimate sustainable ... -
Nonlinear crosstalk in broadband multi-channel echosounders
Khodabandeloo, Babak; Ona, Egil; Macaulay, Gavin; Korneliussen, Rolf (Peer reviewed; Journal article, 2021)Distortion of acoustic wave caused by nonlinear propagation transfers acoustic energy into higher harmonics of the transmitted signal. When operating several broadband echosounders with non-overlapping frequency bands to ... -
Remote sizing of fish-like targets using broadband acoustics
Kubilius, Rokas; Macaulay, Gavin; Ona, Egil (Peer reviewed; Journal article, 2020) -
Report from a krill focused survey with RV Kronprins Haakon and land-based predator work in Antarctica during 2018/2019
Krafft, Bjørn Arne; Bakkeplass, Kjell Gunnar; Berge, Terje; Biuw, Martin; Erices, Julio Alberto; Jones, Elizabeth Marie; Knutsen, Tor; Kubilius, Rokas; Kvalsund, Merete; Lindstrøm, Ulf; Macaulay, Gavin; Renner, Angelika; Rey, Alina; Søiland, Henrik; Wienerroither, Rupert; Ahonen, Heidi; Goto, Jade; Hoem, Nils; Huerta, Magdelena; Höfer, Juan; Iden, Oda; Jouanneau, William; Kruger, Lucas; Liholt, Håvard; Lowther, Andy; Makhado, Azwianewi B.; Mestre, Mireia; Narvestad, Audun; Oosthuisen, Chris; Rodrigues, Jose; Øyerhamn, Rune (Rapport fra havforskningen;2019 - 21, Research report, 2019)The primary objective for this krill research activity was twofold 1) to conduct a survey that provides updated estimates of the biomass and distribution of krill which are used in models to estimate sustainable yield in ...