Swimming angle and target strength of larval Japanese anchovy (Engraulis japonicus)

Ito, Yusuke; Yasuma, Hiroki; Masuda, Reiji; Minami, Kenji; Matsukura, Ryuichi; Morioka, Saho; Miyashita, Kazushi

doi:10.1007/s12562-011-0323-1

Cited by 16 publications

(4 citation statements)

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“…Only Japanese anchovy occasionally shows ~200 individuals/400m 2 . However, because the average body size of Japanese anchovy is ~2 cm in our research season, echo intensity of Japanese anchovy individual would be extremely small (e.g., less than 1% of echo intensity of small jack mackerel individuals) [ 29 ]. Therefore, echo signals from the anchovy scarcely contribute to our analyses.…”

Section: Methodsmentioning

confidence: 99%

Environmental DNA as a ‘Snapshot’ of Fish Distribution: A Case Study of Japanese Jack Mackerel in Maizuru Bay, Sea of Japan

et al. 2016

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Recent studies in streams and ponds have demonstrated that the distribution and biomass of aquatic organisms can be estimated by detection and quantification of environmental DNA (eDNA). In more open systems such as seas, it is not evident whether eDNA can represent the distribution and biomass of aquatic organisms because various environmental factors (e.g., water flow) are expected to affect eDNA distribution and concentration. To test the relationships between the distribution of fish and eDNA, we conducted a grid survey in Maizuru Bay, Sea of Japan, and sampled surface and bottom waters while monitoring biomass of the Japanese jack mackerel (Trachurus japonicus) using echo sounder technology. A linear model showed a high R2 value (0.665) without outlier data points, and the association between estimated eDNA concentrations from the surface water samples and echo intensity was significantly positive, suggesting that the estimated spatial variation in eDNA concentration can reflect the local biomass of the jack mackerel. We also found that a best-fit model included echo intensity obtained within 10–150 m from water sampling sites, indicating that the estimated eDNA concentration most likely reflects fish biomass within 150 m in the bay. Although eDNA from a wholesale fish market partially affected eDNA concentration, we conclude that eDNA generally provides a ‘snapshot’ of fish distribution and biomass in a large area. Further studies in which dynamics of eDNA under field conditions (e.g., patterns of release, degradation, and diffusion of eDNA) are taken into account will provide a better estimate of fish distribution and biomass based on eDNA.

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Section: Methodsmentioning

confidence: 99%

Environmental DNA as a ‘Snapshot’ of Fish Distribution: A Case Study of Japanese Jack Mackerel in Maizuru Bay, Sea of Japan

et al. 2016

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“…According to field validation in Maizuru Bay combining acoustic surveys and visual confirmation of jack mackerel schools by snorkelling, we assumed the range of Δ S V of jack mackerel between −6.4 and 5.2 dB. This criterion discriminates the jack mackerel from larval Japanese anchovy ( Engraulis japonicus ), the subdominant species in the bay (Masuda, 2008), which reflects the high frequency echo strongly as compared to low frequency (Ito et al., 2011) and was used to determine S V of the jack mackerel in 1 m 3 water cubes. S V values were extracted for every 10 m segment of the survey line for every 1 m of depth using Echoview ver.…”

Section: Methodsmentioning

confidence: 99%

Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling

et al. 2020

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We propose a general framework of abundance estimation based on spatially replicated quantitative measurements of environmental DNA in which production, transport, and degradation of DNA are explicitly accounted for. Application to a Japanese jack mackerel (Trachurus japonicus) population in Maizuru Bay revealed that the method gives an estimate of population abundance comparable to that of a quantitative echo sounder method. These findings indicate the ability of environmental DNA to reliably reflect population abundance of aquatic macroorganisms and may offer a new avenue for population monitoring based on the fast, cost-effective, and non-invasive sampling of genetic information.Knowledge on the distribution and abundance of species is crucial for ecology and related applied fields such as wildlife management and fisheries. The detection and quantification of environmental DNA (eDNA) is an emerging methodology for ecological studies and could enhance the ability of investigators to infer occurrence and abundance of species. This approach has been applied, especially but not limited to, to aquatic species such as fish and amphibians and has been identified as a powerful and yet cost-effective tool for species detection (Bohmann et al. 2014, Rees

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“…Δ S V was defined as the diﬀerence in the volume backscattering strength ( S V ) between the two frequencies as follows: According to field validation in Maizuru Bay combining acoustic surveys and visual confirmation of jack mackerel schools by snorkelling, we assumed the range of Δ S V of jack mackerel between −6.4 and 5.2 dB. This criterion discriminates the jack mackerel from larval Japanese anchovy ( Engraulis japonicus ), the subdominant species in the bay (Masuda 2008), which reflects the high frequency echo strongly as compared to low frequency (Ito et al 2011) and was used to determine S V of the jack mackerel in 1 m 3 water cubes in Echoview ver. 9.0.…”

Section: Methodsmentioning

confidence: 99%

Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling

Fukaya

Murakami

Yoon

et al. 2018

Preprint

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1We propose a general framework of abundance estimation based on spatially replicated quan-2 titative measurements of environmental DNA in which production, transport, and degradation of 3 DNA are explicitly accounted for. Application to a Japanese jack mackerel (Trachurus japonicus) 4 population in Maizuru Bay revealed that the method gives an estimate of population abundance 5 comparable to that of a quantitative echo sounder method. These findings indicate the ability of 6 environmental DNA to reliably reflect population abundance of aquatic macroorganisms and may 7 offer a new avenue for population monitoring based on the fast, cost-effective, and non-invasive 8 sampling of genetic information. 9 10 Knowledge on the distribution and abundance of species is crucial for ecology and related 11 applied fields such as wildlife management and fisheries. The detection and quantification of 12 environmental DNA (eDNA) is an emerging methodology for ecological studies and could enhance 13 the ability of investigators to infer occurrence and abundance of species. This approach has been 14 applied, especially but not limited to, to aquatic species such as fish and amphibians and has been 15 identified as a powerful and yet cost-effective tool for species detection (Bohmann et al. 2014, Rees 16 et al. 2014, Thomsen & Willerslev 2015, Goldberg et al. 2016, Deiner et al. 2017 2018). Challenges remain, however, in quantitative applications of eDNA. Since earlier studies 18 revealed positive correlations between species abundance and eDNA concentration (Takahara et al. 19 2012, Thomsen et al. 2012, Goldberg et al. 2013, Pilliod et al. 2013, Eichmiller et al. 2014, it has 20 been expected that local population abundance may be inferred by measuring the concentration of 21 eDNA at a given locality. Indeed, an analytical framework proposed recently for eDNA-based 22 between eDNA concentration and the underlying population size (Chambert et al. 2018). 24Nonetheless, such a definite relation may not always be present, possibly depending on e.g. the 25 shedding rate, transport, and exogenous input of eDNA (Pilliod et al. 2013, Eichmiller et al. 2014 Lacoursière- Roussel et al. 2016, Yamamoto et al. 2016, Jo et al. 2017. 27 The fundamental factors that underlie such context dependency are the 'ecology of eDNA': 28 the distribution of eDNA in space and time stems from processes governing the origin, state, 29 transport, and fate of eDNA particles (Barnes & Turner 2016). Thus, in applications of the eDNA 30 methodology, detailed information about such processes may be critical. Without relevant knowledge 31 of these processes, for example, the spatial and temporal scales of information provided by eDNA 32 remain largely uncertain (Thomsen & Willerslev 2015, Goldberg et al. 2016, Hansen et al. 2018. 33Therefore, here, our purpose was to develop a general approach to eDNA-based abundance 34 estimation that can fully account for the ecology of eDNA, i.e. the rate of production and 35 degradation of eDNA as well as the transpor...

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Swimming angle and target strength of larval Japanese anchovy (Engraulis japonicus)

Cited by 16 publications

References 15 publications

Environmental DNA as a ‘Snapshot’ of Fish Distribution: A Case Study of Japanese Jack Mackerel in Maizuru Bay, Sea of Japan

Environmental DNA as a ‘Snapshot’ of Fish Distribution: A Case Study of Japanese Jack Mackerel in Maizuru Bay, Sea of Japan

Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling

Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling

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