Indice de réflexion latérale du saumon Atlantique (Salmo salar), de la truite de mer (Salmo trutta), du corégone (Coregonus lavaretus) et du brochet (Esox lucius).

Lilja, Juha; Marjomäki, Timo J.; Riikonen, Raimo; Jurvelius, Juha

doi:10.1016/s0990-7440(00)01072-x

Cited by 41 publications

(4 citation statements)

References 8 publications

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“…One of the limitations of this study is the lack of a dorsalaspect target strength model for salmonids, which is important for downward-looking echosounder applications. Previous studies of the relationship between target strength and body lengths of adult salmon have been undertaken to monitor fish migration in rivers, but are limited to the side-and ventral-aspects of the fish (Kubecka and Duncan 1998;Lilja et al 2000;Knudsen et al 2004). To our knowledge, the only published information on dorsal aspect target strengths of salmonids comes from ex-situ experiments at 50 kHz on relatively small kokanee salmon (Oncorhynchus nerka) (Fig.…”

Section: Discussionmentioning

confidence: 99%

Southern resident killer whales encounter higher prey densities than northern resident killer whales during summer

Sato

Trites

Gauthier

2021

Can. J. Fish. Aquat. Sci.

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The decline of southern resident killer whales (Orcinus orca) may be due to a shortage of prey, but there is little data to test this hypothesis. We compared the availability of prey (Chinook salmon, Oncorhynchus tshawytscha) sought by southern residents in Juan de Fuca Strait during summer with the abundance and distribution of Chinook available to the much larger and growing population of northern resident killer whales feeding in Johnstone Strait. We used ship-based multifrequency echosounders to identify differences in prey fields that may explain the dynamics of these two killer whale populations. Contrary to expectations, we found that both killer whale habitats had patchy distributions of prey that did not differ in their frequencies of occurrence, nor in the size compositions of individual fish. However, the density of fish within each patch was 4–6 times higher in the southern resident killer whale habitat. These findings do not support the hypothesis that southern resident killer whales are experiencing a prey shortage in the Salish Sea during summer and suggest a combination of other factors is affecting overall foraging success.

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Section: Discussionmentioning

confidence: 99%

Southern resident killer whales encounter higher prey densities than northern resident killer whales during summer

Sato

Trites

Gauthier

2021

Can. J. Fish. Aquat. Sci.

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“…Other studies have compared fish echo traces with those of pelagic invertebrates (Knudsen and Larsson 2009;Knudsen et al 2006), studied factors affecting D r a f t recruitment variability (Axenrot and Degerman 2016), and have investigated effects of introduced species (Brabrand and Faafeng 1993) and climate change (Nyberg et al 2001) on aquatic systems. (Lilja et al 2000) studied TS of Atlantic salmon, brown trout (Salmo trutta), whitefish and pike (Esox lucius) in Finland (see Table 1), where extensive work has been done on fish abundance estimates (e.g. Jurvelius and Sammalkorpi 1995;Jurvelius et al 1984).…”

Section: Europementioning

confidence: 99%

“…Some TS-length models for a) Coregonids (dorsal aspect), b) Salmo trutta (side aspect), c) Clupeids (dorsal aspect), and d) Cyprinids (dorsal aspect). Colours indicate authors: black (Kubecka and Duncan 1998); red (Fleischer et al 1997); blue (Mehner 2006b); brown (Swierzowski and Doroszczyk 2004); green (Frouzova et al 2005); orange (Lilja et al 2000); purple (Warner et al 2002). Line styles indicate acoustic frequency: 70 kHz (dash dot); 120 kHz (solid); 200 kHz (small dash); 420 kHz (large dash).…”

Section: R a F Tmentioning

confidence: 99%

A global review of the spatial, taxonomic, and temporal scope of freshwater fisheries hydroacoustics research

Pollom

Rose

2016

Environ. Rev.

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This review assessed the status and scope of freshwater hydroacoustic fisheries research in global aquatic ecosystems with emphasis on (i) geographical and spatial scope, (ii) taxonomic range at the species and family levels (restricted to bony fishes of the Actinopterygii and Sarcopterygii), and (iii) temporal scope. Hydroacoustic measures have been used by ecologists and managers of freshwater systems for several decades, with major progress in technology and methods in recent years. A literature review indicated 296 research contributions that employed hydroacoustics to study freshwater fisheries in 294 different aquatic ecosystems. Spatially, hydroacoustics research in freshwater systems have thus far been concentrated in developed countries, particularly in North America and Northern and Central Europe (83% of the studies reviewed here). Most studies were small in spatial scale and short-term, with 80% including only a single body of water and 63% conducted over a single year or season (75% spanning less than two years). In addition, effects of fish morphology and behavior on acoustic target strength (TS) and taxonomic identification are not well parameterized, with only 21 species receiving empirical study of TS. Despite progress, the present study reveals gaps in the knowledge needed for wider applications to management. These include larger biogeographical and temporal scales of study and further empirical research on TS and taxonomic identification. Recent advances in size rather than species-based methods and theory offer potential solutions to this issue but require further investigation. We conclude with recommendations for systematic hydroacoustic research to enable more effective monitoring, management, and conservation of fisheries and freshwater ecosystems.

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“…Target strength distributions may be used to assess the size structure of a fish stock (Orduna et al, 2021;Wanzenböck et al, 2020). To accomplish this, several models illustrating the relationship between fish size and target strength should be used, from multispecies general equations to particular species-specific equations (Love, 1971;Frouzova et al, 2005;Lilja et al, 2000). The TS value may also be used to estimate the horizontal-vertical distribution, fish size, and fish biomass in the water column (Manik and Nurkomala, 2016;Pujiyati et al, 2017;Hidayat et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Fish Stock Status Assessment in Alue Naga Waters Using A 200 Khz Single Beam Echosounder

et al. 2023

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Monitoring fish stocks is an important part of sustainable management of fisheries resources. Conducting the current evaluation is very difficult since there are no reliable data on the potential for fisheries in the waters surrounding Banda Aceh city. The hydroacoustic method was used for the first time in the waters of Alue Naga, located north of Banda Aceh, to evaluate the condition of fish stocks. A single beam scientific echosounder with a frequency of 200 kHz was used to collect hydroacoustic data in the area. The collected data was then processed using the Sonar5-Pro software. Cell integration was carried out at an interval of 10 meters vertically with an elementary sampling distance (ESD) of 200 m. While the volume backscattering strength (SV) value tends to be the highest in intermediate layers, the target strength (TS) value was found to be maximum in deeper layer, reaching a maximum value of -49.46 dB at a depth of 51–60 m. Area density value (#.ha-1) was found to be the highest at a depth of 11-20 m, while Biomass (g.ha-1) at a depth of 21-30 m was the highest among other depth layers with a value of 1558 g.ha-1. According to the in-situ catches of Carangoides, Selaroides, Aphareus, Variola, and Priacanthidae, there are a number of potential reef fish resources in the waters of Alue Naga. The findings of this study strongly support the conclusion that the hydroacoustic method effectively provides comprehensive information on the horizontal and vertical distribution of fish in Alue Naga waters.

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Indice de réflexion latérale du saumon Atlantique (Salmo salar), de la truite de mer (Salmo trutta), du corégone (Coregonus lavaretus) et du brochet (Esox lucius).

Cited by 41 publications

References 8 publications

Southern resident killer whales encounter higher prey densities than northern resident killer whales during summer

Southern resident killer whales encounter higher prey densities than northern resident killer whales during summer

A global review of the spatial, taxonomic, and temporal scope of freshwater fisheries hydroacoustics research

Fish Stock Status Assessment in Alue Naga Waters Using A 200 Khz Single Beam Echosounder

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