Gavin J. Macaulay
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View article: <scp>KRILLSCAN</scp>: An automated open‐source software for processing and analysis of echosounder data from the Antarctic krill fishery
<span>KRILLSCAN</span>: An automated open‐source software for processing and analysis of echosounder data from the Antarctic krill fishery Open
Krillscan software was developed to automatically process echosounder data and achieve an accelerated and transparent analysis of backscatter data that allows calculation of target biomass. Herein, the fishery for Antarctic krill ( Euphaus…
View article: Field comparison of Antarctic krill (<i>Euphausia superba</i>) backscatter and aggregation types using NORTEK and SIMRAD echosounders
Field comparison of Antarctic krill (<i>Euphausia superba</i>) backscatter and aggregation types using NORTEK and SIMRAD echosounders Open
Temporal distributions of Antarctic krill (Euphausia superba) density and aggregation types were characterized and compared using Nortek Signature100 and SIMRAD Wideband Autonomous Transceiver (WBAT) upward-looking echosounders. Noise vari…
View article: Quantitative processing of broadband data as implemented in a scientific split‐beam echosounder
Quantitative processing of broadband data as implemented in a scientific split‐beam echosounder Open
The use of quantitative broadband echosounders for biological studies and surveys can offer considerable advantages over narrowband echosounders. These include improved spectral‐based target identification and significantly increased abili…
View article: Distribution and biomass estimation of Antarctic krill (<i>Euphausia superba</i>) off the South Orkney Islands during 2011–2020
Distribution and biomass estimation of Antarctic krill (<i>Euphausia superba</i>) off the South Orkney Islands during 2011–2020 Open
Antarctic krill is a key species in the Southern Ocean and subject to the most extensive fishery in the Antarctic. The Norwegian Institute of Marine Research has conducted acoustic-trawl monitoring of krill off the South Orkneys annually s…
View article: Antarctic krill (<i>Euphausia superba</i>) catch weight estimated with a trawl‐mounted echosounder during fishing
Antarctic krill (<i>Euphausia superba</i>) catch weight estimated with a trawl‐mounted echosounder during fishing Open
Reporting reliable catch weight estimates is important for all fisheries management. This study explores the potential for precise and direct estimation of catch weight (green weight) for the Antarctic krill ( Euphausia superba ) fishery b…
View article: Remote acoustic sizing of tethered fish using broadband acoustics
Remote acoustic sizing of tethered fish using broadband acoustics Open
Remote fish sizing is desirable in fisheries (e.g., pre-catch) and research (e.g., platforms without biological sampling capacity) applications. In those contexts, the high spatial resolution of pulse compressed broadband echoes combined w…
View article: Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E)
Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E) Open
Regular monitoring is an important component of the successful management of pelagic animals of interest to commercial fisheries. Here we provide a biomass estimate for Antarctic krill ( Euphausia superba ) in the eastern sector of the Com…
View article: Antarctic krill (Euphausia superba) distributions, aggregation structures and predator interactions in Bransfield Strait
Antarctic krill (Euphausia superba) distributions, aggregation structures and predator interactions in Bransfield Strait Open
Aggregation structures of Antarctic krill ( Euphausia superba ) and predator interactions were investigated using active acoustic data collected for approximately one month by WBAT and Signature100 echosounders deployed on moorings in two …
View article: Quantitative processing of broadband data as implemented in a scientific splitbeam echosounder
Quantitative processing of broadband data as implemented in a scientific splitbeam echosounder Open
The use of quantitative broadband echosounders for biological studies and surveys offers considerable advantages over narrowband echosounders. These include improved spectral-based target identification and significantly increased ability …
View article: Estimating target strength and physical characteristics of gas-bearing mesopelagic fish from wideband <i>in situ</i> echoes using a viscous-elastic scattering model
Estimating target strength and physical characteristics of gas-bearing mesopelagic fish from wideband <i>in situ</i> echoes using a viscous-elastic scattering model Open
Wideband (38 and 50–260 kHz) target strength of organisms were measured in situ using a towed platform in mesopelagic (200–1000 m depth) layers. Organisms with a gas-inclusion are strong scatterers of sound and acoustically distinct from o…
View article: OUP accepted manuscript
OUP accepted manuscript Open
Estimates of the distribution and density of Antarctic krill (Euphausia superba Dana, 1850) were derived from a large-scale survey conducted during the austral summer in the Southwest Atlantic sector of the Southern Ocean and across the Sc…
View article: An acoustic method to observe the distribution and behaviour of mesopelagic organisms in front of a trawl
An acoustic method to observe the distribution and behaviour of mesopelagic organisms in front of a trawl Open
We describe a method to allow acoustic sampling at depths not reachable by the higher frequencies of ship hull-mounted echosounders and observe the abundance and behaviour of individual organisms in front of trawls. A self-contained scient…
View article: Field measurements of acoustic absorption in seawater from 38 to 360 kHz
Field measurements of acoustic absorption in seawater from 38 to 360 kHz Open
Accurate estimates of acoustic absorption in seawater are crucial to the acoustic estimation of aquatic biomass. Estimates of acoustic absorption were obtained via a “pulse-echo” method, implemented using commonly available scientific echo…
View article: Remote sizing of fish-like targets using broadband acoustics
Remote sizing of fish-like targets using broadband acoustics Open
Broadband echosounder systems provide very high range resolution that could resolve different parts of fish and hence provide estimates of fish size. The potential for, and accuracy of, direct acoustic sizing of fish was tested on fish-lik…
View article: REPORT FROM A KRILL FOCUSED SURVEY WITH RV KRONPRINS HAAKON AND LAND-BASED PREDATOR WORK IN ANTARCTICA DURING 2018/2019
REPORT FROM A KRILL FOCUSED SURVEY WITH RV KRONPRINS HAAKON AND LAND-BASED PREDATOR WORK IN ANTARCTICA DURING 2018/2019 Open
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 CCAMLR Area 48 and…
View article: Instantaneous areal population density of entire Atlantic cod and herring spawning groups and group size distribution relative to total spawning population
Instantaneous areal population density of entire Atlantic cod and herring spawning groups and group size distribution relative to total spawning population Open
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 population den…
View article: Comparisons of echo-integration performance from two multiplexed echosounders
Comparisons of echo-integration performance from two multiplexed echosounders Open
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. When the acousti…
View article: Acoustic manual for the krill synoptic survey in 2019
Acoustic manual for the krill synoptic survey in 2019 Open
The previously presented document at the 2018 ASAM WG meeting (ASAM-18-07) described a design and plans for a synoptic krill acoustic survey in CCAMLR area 48 in 2019. The survey involves the collaborative efforts of Norway, Association of…
View article: Development of methods relevant to feedback management (FBM) for the krill fishery
Development of methods relevant to feedback management (FBM) for the krill fishery Open
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 CCAMLR Planning D…
View article: Multinational large scale krill synoptic survey in CCAMLR Area 48 in 2019-survey plan and protocol for consideration by SG-ASAM 2018
Multinational large scale krill synoptic survey in CCAMLR Area 48 in 2019-survey plan and protocol for consideration by SG-ASAM 2018 Open
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 yield. The p…
View article: Protocols for trawl sampling, recording of biological data, and hydrography for the 2019 international synoptic krill survey in Area 48
Protocols for trawl sampling, recording of biological data, and hydrography for the 2019 international synoptic krill survey in Area 48 Open
Experience gained through participation in international programmes like BIOMASS and the CCAMLR 2000 Survey has demonstrated that standardization of equipment and methods is one of the most crucial steps for any successful work during the …
View article: Acoustic identification of marine species using a feature library
Acoustic identification of marine species using a feature library Open
Sonars and echosounders are widely used for remote sensing of life in the marine environment. There is an ongoing need to make the acoustic identification of marine species more correct and objective and thereby reduce the uncertainty of a…
View article: Comparisons among ten models of acoustic backscattering used in aquatic ecosystem research
Comparisons among ten models of acoustic backscattering used in aquatic ecosystem research Open
Analytical and numerical scattering models with accompanying digital representations are used increasingly to predict acoustic backscatter by fish and zooplankton in research and ecosystem monitoring applications. Ten such models were appl…
View article: Calibration of acoustic instruments.
Calibration of acoustic instruments. Open
Acoustic sampling has long been a standard survey tool for estimating the abundance and distribution of fish, zooplankton, and their seabed habitat (Kimura, 1929; Sund, 1935; Holliday, 1972a; Nielson et al., 1980). Typically, acoustic surv…