David A. Demer
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View article: Identification of echoes from demersal aggregations of hake, <i>Merluccius productus</i>, in the Gulf of California
Identification of echoes from demersal aggregations of hake, <i>Merluccius productus</i>, in the Gulf of California Open
The distribution of Pacific hake, Merluccius productus, extends from Northern Canada to Southern Baja California and into the Gulf of California (GC), Mexico. In an emergent fishery in the Northern GC, hake dominates finfish catches from F…
View article: Uncrewed surface vehicles (USVs) as platforms for fisheries and plankton acoustics
Uncrewed surface vehicles (USVs) as platforms for fisheries and plankton acoustics Open
Uncrewed surface vehicles (USVs) equipped with echosounders have the potential to replace or enhance acoustic observations from conventional research vessels (RVs), increase spatial and temporal coverage, and reduce cost and carbon emissio…
View article: An updated model of potential habitat for northern stock Pacific Sardine (<scp><i>Sardinops sagax</i></scp>) and its use for attributing survey observations and fishery landings
An updated model of potential habitat for northern stock Pacific Sardine (<span><i>Sardinops sagax</i></span>) and its use for attributing survey observations and fishery landings Open
Three years after the 2015 collapse of the northern stock of Pacific Sardine that is predominantly located off the west coast of the United States, acoustic‐trawl (A‐T) surveys documented an increase in the presence and persistence of the …
View article: Distribution, biomass, and demography of coastal pelagic fishes in the California Current Ecosystem during summer 2016 based on acoustic-trawl sampling
Distribution, biomass, and demography of coastal pelagic fishes in the California Current Ecosystem during summer 2016 based on acoustic-trawl sampling Open
View article: A Practical Approach to Monitoring Marine Protected Areas: An Application to El Bajo Espíritu Santo Seamount Near La Paz, Mexico
A Practical Approach to Monitoring Marine Protected Areas: An Application to El Bajo Espíritu Santo Seamount Near La Paz, Mexico Open
Worldwide, marine protected areas (MPAs) are increasingly created to protect and restore selected parts of the ocean and to enhance recreation, fishing, and sustainable resources. However, this process has outpaced the development and impl…
View article: Report on the Summer 2019 California Current Ecosystem Survey (1907RL), 13 June to 9 September 2019, conducted aboard NOAA Ship Reuben Lasker, Fishing Vessels Lisa Marie and Long Beach Carnage, and three unmanned sailboats
Report on the Summer 2019 California Current Ecosystem Survey (1907RL), 13 June to 9 September 2019, conducted aboard NOAA Ship Reuben Lasker, Fishing Vessels Lisa Marie and Long Beach Carnage, and three unmanned sailboats Open
View article: Distribution, Biomass, and Demography of Coastal Pelagic Fishes in the California Current Ecosystem During Summer 2019 Based on Acoustic-Trawl Sampling
Distribution, Biomass, and Demography of Coastal Pelagic Fishes in the California Current Ecosystem During Summer 2019 Based on Acoustic-Trawl Sampling Open
View article: Length conversions and mass–length relationships of five forage‐fish species in the California current ecosystem
Length conversions and mass–length relationships of five forage‐fish species in the California current ecosystem Open
Length‐measurement conversions and seasonal mass–length relationships (MLR) for Pacific herring Clupea pallasii , northern anchovy Engraulis mordax , Pacific sardine Sardinops sagax , Pacific mackerel Scomber japonicus and jack mackerel Tr…
View article: Distribution, biomass, and demography of coastal pelagic fishes in the California Current Ecosystem during summer 2018 based on acoustic-trawl sampling
Distribution, biomass, and demography of coastal pelagic fishes in the California Current Ecosystem during summer 2018 based on acoustic-trawl sampling Open
NOAA technical memorandum NMFS SWFSC ; 613
View article: Distribution, biomass, and demography of coastal pelagic fishes in the California Current Ecosystem during summer 2017 based on acoustic-trawl sampling
Distribution, biomass, and demography of coastal pelagic fishes in the California Current Ecosystem during summer 2017 based on acoustic-trawl sampling Open
View article: Calibrations of Wide-Bandwidth Transceivers (WBT Mini) with Dualfrequency Transducers (ES38-18/200-18C) for Saildrong Surveys of the California Current Ecosystem During Summer 2018
Calibrations of Wide-Bandwidth Transceivers (WBT Mini) with Dualfrequency Transducers (ES38-18/200-18C) for Saildrong Surveys of the California Current Ecosystem During Summer 2018 Open
View article: Report on the 2018 California Current Ecosystem (CCE) Survey (1807RL), 26 June to 23 September 2018, Conducted Aboard NOAA Ship Reuben Lasker
Report on the 2018 California Current Ecosystem (CCE) Survey (1807RL), 26 June to 23 September 2018, Conducted Aboard NOAA Ship Reuben Lasker Open
View article: Best Practices for Implementing Acoustic Technologies to Improve Reef Fish Ecosystem Surveys: Report from the 2017 GCFI Acoustics Workshop.
Best Practices for Implementing Acoustic Technologies to Improve Reef Fish Ecosystem Surveys: Report from the 2017 GCFI Acoustics Workshop. Open
Approximately 330 participants from 30 countries attended the 70th Gulf and Caribbean Fisheries Institute (GCFI) conference held in Merida, Mexico during 4-10 November 2017. The conference featured a symposium on Acoustic Technologies to I…
View article: Target strength of skipjack tuna (Katsuwanus pelamis) associated with fish aggregating devices (FADs)
Target strength of skipjack tuna (Katsuwanus pelamis) associated with fish aggregating devices (FADs) Open
This paper presents measures of target strength (TS; dB re 1 m2) and models of TS vs. fork length (L; cm), i.e. TS=20logL+b20, for skipjack tuna associated with fish aggregating devices (FADs) in the Central Pacific Ocean. Measurements wer…
View article: Report on the collection of data during the Summer 2016 California Current Ecosystem Survey (1606RL), 28 June to 22 September 2016, conducted aboard Fisheries Survey Vessel Reuben Lasker
Report on the collection of data during the Summer 2016 California Current Ecosystem Survey (1606RL), 28 June to 22 September 2016, conducted aboard Fisheries Survey Vessel Reuben Lasker Open
NOAA Technical Memorandum NMFS-SWFSC ; 604
View article: Report on the collection of data during the Summer 2017 California Current Ecosystem Survey (1706RL), 19 June to 11 August 2017, conducted aboard the Fisheries Survey Vessel Reuben Lasker
Report on the collection of data during the Summer 2017 California Current Ecosystem Survey (1706RL), 19 June to 11 August 2017, conducted aboard the Fisheries Survey Vessel Reuben Lasker Open
View article: Report on the SWFSC’s collection of data during the 2015 Joint U.S.-Canada Integrated Acoustic and Trawl Survey of Pacific Hake and Coastal Pelagic Species (SaKe 2015; 1507SH) within the California Current Ecosystem, 15 June to 10 September 2015, conducted aboard Fisheries Survey Vessel Bell M. Shimada.
Report on the SWFSC’s collection of data during the 2015 Joint U.S.-Canada Integrated Acoustic and Trawl Survey of Pacific Hake and Coastal Pelagic Species (SaKe 2015; 1507SH) within the California Current Ecosystem, 15 June to 10 September 2015, conducted aboard Fisheries Survey Vessel Bell M. Shimada. Open
NOAA Technical Memorandum NMFS-SWFSC ; 603
View article: Estimating fish abundance at spawning aggregations from courtship sound levels
Estimating fish abundance at spawning aggregations from courtship sound levels Open
Sound produced by fish spawning aggregations (FSAs) permits the use of passive acoustic methods to identify the timing and location of spawning. However, difficulties in relating sound levels to abundance have impeded the use of passive ac…
View article: Assessment of the Pacific sardine resource in 2017 for U.S.A. management in 2017-18.
Assessment of the Pacific sardine resource in 2017 for U.S.A. management in 2017-18. Open
Disclaimer: This information is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by NOAA-National Marine Fisheries Service. It does n…
View article: Report on the collection of data during the acoustic-trawl and daily egg production methods survey of coastal pelagic fish species and krill (1504sh) within the California current ecosystem, 28 March to 1 May 2015, conducted aboard fisheries survey vessel Bell M. Shimada
Report on the collection of data during the acoustic-trawl and daily egg production methods survey of coastal pelagic fish species and krill (1504sh) within the California current ecosystem, 28 March to 1 May 2015, conducted aboard fisheries survey vessel Bell M. Shimada Open
View article: Mobile acoustic sampling to map bathymetry and quantify the densities and distributions of salmonid smolt predators in the San Joaquin River
Mobile acoustic sampling to map bathymetry and quantify the densities and distributions of salmonid smolt predators in the San Joaquin River Open
View article: Improving the estimations of transect length and width for underwater visual surveys of targets on or near the seabed
Improving the estimations of transect length and width for underwater visual surveys of targets on or near the seabed Open
Demersal marine organisms may be surveyed visually using cameras deployed on a submersible vehicle, e.g. a remotely operated vehicle (ROV). For estimating animal densities along visual transects, the sampled area may be calculated from the…
View article: Acoustic-trawl estimates of northern-stock Pacific sardine biomass during 2015
Acoustic-trawl estimates of northern-stock Pacific sardine biomass during 2015 Open
View article: Optimizing transmit interval and logging range while avoiding aliased seabed echoes
Optimizing transmit interval and logging range while avoiding aliased seabed echoes Open
Echosounder surveys of fish and zooplankton are typically conducted using fixed values of the echosounder transmit-pulse (“ping”) interval and data-logging range. The transmit-pulse interval must be long enough to sample to the range of th…
View article: Remote sensing of habitat characteristics using echo metrics and image-based seabed classes
Remote sensing of habitat characteristics using echo metrics and image-based seabed classes Open
The seabed can be classified using data from vertical, split-beam echosounders. This was demonstrated recently using a model parameterized with acoustic estimates of slope, roughness, normal-incidence backscattering strength, and variation…
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: Two-Million-Liter Tank Expands the Boundaries of Marine Technology Innovation: National Resource Available for Advancing Marine Science
Two-Million-Liter Tank Expands the Boundaries of Marine Technology Innovation: National Resource Available for Advancing Marine Science Open
With one small move across a street, NOAA Fisheries, our nation's steward of marine ecosystems, made a giant leap into the future of ocean science and technology development. The new Southwest Fisheries Science Center facility in La Jolla,…
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…