Acoustic discrimination of two zooplankton species (mysid) at 38 and 120kHz

David, P. M.; Guerin-Ancey, Odile; Cuyck, J.P. Van

doi:10.1016/s0967-0637(98)00064-8

Cited by 12 publications

(8 citation statements)

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“…Peiper et al, 1990;Thomas and Kirsch, 2000;Miyashita, 2003;Meekan et al, 2003;Ressler and Jochens, 2003) and those moored to the bottom (e.g. Flagg et al, 1994;David et al, 1999), might provide partial solutions to these problems, though the technology requires further refinement. (These technological advances, along with satellite-borne remote sensors (e.g.…”

Section: Insight and Outlookmentioning

confidence: 99%

Fisheries oceanography and the ecology of early life histories of fishes: a perspective over fifty years

Govoni¹

2005

Sci. Mar.

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SUMMARY: Fisheries oceanography can be defined as the study of the ecology of fishes in the ocean: so defined, it comprises study at all levels of ecological organization-organisms, populations, communities, and ecosystems. The early life history of fishes plays out at each of these levels of organization. A paradigm developed by Johan Hjort at the turn of the twentieth century, along with postulates by Hjort and many of his colleagues that followed, came to guide much of fisheries oceanography through the ensuing hundred years. Research themes that address these postulates can be roughly partitioned as the study of the physiological ecology of the eggs and larvae of fishes in the sea, and the study of the abundance and distribution of fish propagules. Using case studies of organisms and physical processes, considerable progress has been made in understanding the causes of variation in population recruitment, defined either by stage-based models and simulated by individual-based models. Some of this progress has been published in Scientia Marina, or its predecessor Investigación Pesquera. The causes of variation, however, are interactive and operative at differing, yet often overlapping, spatial and temporal scales. Difficulty in matching spatial scales that typically differ by an order of magnitude or more, will continue to trouble the resolution of causes of population recruitment. Moreover, study of the causes of variation in recruitment has not led to predictive power at an annual scale. Prediction at a decadal scale, using community (or more appropriately larval fish assemblages) and ecosystem level dynamics, is more hopeful. -La oceanografía pesquera puede ser definida como la ecología de los peces en el océano: definida de este modo, comprende el estudio a todos los niveles de organización ecológica: organismos, poblaciones, comunidades y ecosistemas. Los primeros estadios de desarrollo de los peces intervienen en cada uno de estos niveles de organización. El paradigma desarrollado por Johan Hjort a principio de siglo veinte, junto con postulados posteriores del propio Hjort y muchos de sus colegas, han servido de guía de la oceanografía pesquera de los siguientes cien años. Los temas de investigación a que conducen estos postulados pueden ser fundamentalmente divididos en el estudio de la ecología fisioló-gica de los huevos y larvas de peces en el mar y el estudio de la distribución y abundancia de los propágulos. Utilizando el estudio de casos particulares de organismos, se han conseguido considerables progresos en la comprensión de las causas de variación en el reclutamiento de las poblaciones, definido ya sea por los modelos basados en el estadio de desarrollo o en simulaciones basadas en el individuo. Algunos de estos avances han sido publicados en Scientia Marina, o en su predecesora Investigación Pesquera. No obstante, las causas de variación son interactivas y operativas a escalas espaciales y temporales distintas, o incluso solapadas. La dificultad para ajustar las escalas espaciales que típicame...

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Section: Insight and Outlookmentioning

confidence: 99%

Fisheries oceanography and the ecology of early life histories of fishes: a perspective over fifty years

Govoni¹

2005

Sci. Mar.

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“…But theoretical models can give widely different results. David et al (1999) . Relationship between volume backscattering (S v in dB) at 120 kHz and mysid density (Log 10 (# m −3 )) (panel A) and mysid biomass (Log 10 (g dry wt m −3 )) (panel B) obtained with vertical net tows.…”

Section: Development Of Analysis Methods and Choice Of Fish Thresholdsmentioning

confidence: 99%

Hydroacoustic measures of Mysis relicta abundance and distribution in Lake Ontario

Rudstam

Schaner

Boscarino

et al. 2008

Aquatic Ecosystem Health &Amp; Management

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Mysis relicta can be observed on echograms as a sound scattering layer when they migrate into the water column at night to feed on zooplankton. However, quantitative measures of mysid abundance with hydroacoustics requires knowledge of mysid target strength (TS), a method of removing fish echoes and contribution from noise, and an understanding of the effect of range on the ability of hydroacoustics to detect mysids (the detection limit). Comparisons of paired net data and acoustics data from July 7, 2005 yielded a mysid TS of −86.3 dB (9 mm animal) and a biomass TS of −58.4 dB (g dry wt) −1 . With ambient noise levels (S v of −125 dB at 1 m depth) and this TS, we can detect a mysid density of 1 m −3 at 60 m depth with a signal to noise ratio of 3 dB. We present a method to remove backscattering from both noise and fish and apply this method and the new TS data to whole lake acoustic data from Lake Ontario collected in July 25-31, 2005 with a 120 kHz echosounder as part of the annual standard fish survey in that lake. Mysis abundance was strongly depth dependent, with highest densities in areas with bottom depth >100 m, and few mysids in areas with bottom depth <50 m. With the data stratified in five bottom depth strata (>100 m, 100-75 m, 75-50 m, 50-30 m, <30 m), the whole-lake average mysid density was 118 m −2 (CV 21%) and the whole-lake average mysid biomass was 0.19 g dry wt m −2 (CV 22%) in July 2005. The CVs of these densities also account for uncertainty in the TS estimates. This is comparable to whole-lake density estimates using vertical net tows in November, 2005 (93 m −2 , CV 16%).

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“…1, box 5; see Table 2 for a species list) of the western Mediterranean Sea are represented by, at most, five species. In caves, Hemimysis speluncola can form swarms of millions of individuals, Hemimysis margalefi constitutes smaller swarms of at most thousands of individuals whereas Hemimysis lamornae mediterranea rarely gathers more than tens to hundreds of individuals (Passelaigue and Bourdillon, 1986;Carola et al, 1993;David et al, 1999;PAR & PC pers. obs.).…”

Section: Considered Components Of the Cave Ecosystem Model And Respecmentioning

confidence: 99%

An ecosystem-based approach to evaluate the ecological quality of Mediterranean undersea caves

Rastorgueff

Bellan‐Santini

Bianchi

et al. 2015

Ecological Indicators

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Acoustic discrimination of two zooplankton species (mysid) at 38 and 120kHz

Cited by 12 publications

References 0 publications

Fisheries oceanography and the ecology of early life histories of fishes: a perspective over fifty years

Fisheries oceanography and the ecology of early life histories of fishes: a perspective over fifty years

Hydroacoustic measures of Mysis relicta abundance and distribution in Lake Ontario

An ecosystem-based approach to evaluate the ecological quality of Mediterranean undersea caves

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