Target strength of some European fish species and its dependence on fish body parameters

Frouzová, Jaroslava; Kubečka, Jan; Balk, Helge; Frouz, Jan

doi:10.1016/j.fishres.2005.04.011

Cited by 119 publications

(121 citation statements)

References 22 publications

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“…However, significant differences were observed when comparing TS distributions among regions, GT-QB having a greater proportion of smaller fish than FP (K-S test: P ¼ 0.038; median test: P , 0.005) and MV not differing significantly from the other two regions. The fish length distributions obtained from net sampling and converted to TS following Frouzova et al (2005) showed moderate concordance with the measured TS distributions ( Figure 5). Although the peaks in length frequency often did not overlap between the gill-net and push trawl distributions, when the two gear types were available they extended the …”

Section: Target Strength Distributionssupporting

confidence: 55%

“…The conversion of TS into an appropriate estimate of SL relies on the proper scaling between TS and SL. The TS-SL relationship in Frouzova et al (2005) was derived from fish of similar morphologies at all horizontal aspects and at a lower frequency (120 kHz). This probably contributed to the conservative length distributions obtained in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Target strength.-Estimates of target strength (TS [dB]), the acoustic representation of fish length, were derived in Echoview over the same 5-min intervals used for echo integration. Acoustic targets were accepted for processing if they fulfilled single-target criteria and had a measured TS greater than À55 dB (approximately equivalent to a 2.5-cm fish; Frouzova et al 2005). A single-target algorithm was tuned to accept targets with echo envelopes between 0.6 and 1.7 times the pulse duration with a maximum beam compensation of 12 dB (Boswell et al 2007).…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Boswell

Wilson²,

Macrae

et al. 2010

Mar Coast Fish

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We conducted hydroacoustic, gill‐net, and push trawl surveys to quantify changes in habitat‐specific fish size and biomass in shallow (<2‐m) estuarine waters of Barataria Bay, Louisiana, in order to evaluate essential fish habitat. Surveys were conducted monthly between June 2003 and May 2004 among regions located along a north—south salinity gradient. The fish length distributions derived from the gill‐net and push trawl catches showed moderate concordance with the measured target strength distributions, indicating that our integrated approach more effectively characterized the fish community than using only a single gear type would have. Acoustic estimates showed that biomass was highest during fall (mean ± SE; 2.30 ± 0.27 g/m3) and next highest in spring (1.49 ± 0.20 g/m3), with relatively low biomass during summer (0.70 ± 0.14 g/m3) and winter (0.86 ± 0.14 g/m3); pelagic fish biomass from nets was low during winter (53.9 ± 14.9 grams per unit effort [gpue]) but relatively high in fall (846.1 ± 207.2 gpue), spring (774.3 ± 175.5 gpue), and summer (620.3 ± 140.7 gpue). Oyster habitat supported a greater biomass of pelagic fish (acoustic survey: 1.54 ± 0.15 g/m3; gill‐net survey: 467.3 ± 81.0 gpue) than soft‐bottom habitat (acoustic: 0.94 ± 0.11 g/m3; gill‐net: 315.2 ± 54.8 gpue). Among regions, the greatest biomass of pelagic fish was observed at polyhaline stations (acoustic: 1.78 ± 0.19 g/m3; gill‐net: 654.3 ± 136.5 gpue), followed by mesohaline (acoustic: 1.18 ± 0.15 g/m3; gill‐net: 378.5 ± 79.1 gpue) and oligohaline stations (acoustic: 0.82 ± 0.12 g/m3; gill‐net: 228.3 ± 50.2 gpue). Gill‐net biomass was linearly related to the acoustic biomass estimates of small pelagic fish. The complementary, multigear approach proved to be useful in evaluating habitat use and may be particularly helpful in identifying and monitoring ecosystem reference points to evaluate change and in standardizing ecosystem‐based assessment approaches.

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Section: Target Strength Distributionssupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Boswell

Wilson²,

Macrae

et al. 2010

Mar Coast Fish

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show abstract

“…However, acoustic estimates of abundance of this predator, calculated for individual transects ("A" -"L") for fish > 100 mm (> −44 dB according to TS/L T regressions for adult perch dorsal aspect; Frouzová et al, 2005) were generally very low, being 76 ind. ha −1 in June and only 26 ind.…”

Section: Discussionmentioning

confidence: 99%

Ontogenetic changes in the bathypelagic distribution of European perch fry Perca fluviatilis monitored by hydroacoustic methods

Čech

Kubečka

2006

Biologia

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“…To recalculate fish numerical density into fish biomass, the relationship between the acoustical size TS in dB and fish length in centimeters is required. Frouzova's regression for pooled common European species was used (Frouzova, 2005), as this was shown to give the best biomass estimate in another Polish lowland reservoir (Godlewska et al, 2012). With respect to the locations of the 14 stations for each sampling point, each transect length was divided into three equal sections (so-called integration intervals), and the fish abundance estimated for each section was assumed to correspond to a given station.…”

Section: Hydroacoustic Measurements and Fish Gillnettingmentioning

confidence: 99%

Relationships among cyanobacteria, zooplankton and fish in sub-bloom conditions in the Sulejow Reservoir

et al. 2017

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The occurrence of cyanobacteria is particularly characteristic of shallow eutrophic waters, and they often form massive 'blooms' that can affect aquatic invertebrates and fish. However, even a low abundance of cyanobacteria can be hazardous to aquatic organisms, due to the production of toxic metabolites. The aim of this study was to investigate the relationship between cyanobacteria and their toxicity (biological activity) towards zooplankton and fish communities, when only low concentrations of cyanobacterial chlorophyll a (less than 20 μg L -1 ) are detected, i.e. in sub-bloom conditions. Measurements were performed in Sulejow Reservoir (Central Poland), a shallow, lowland, eutrophic reservoir, in which cyanobacterial blooms occur regularly. Fish were assessed using echo-sounding (distribution) and by gillnetting (species composition). Simultaneously, zooplankton, cyanobacteria and physicochemical characteristics were studied at 14 stations situated along hydroacoustic transects. Parameters that characterized the cyanobacteria (cyanobacterial chlorophyll a concentration, the number of 16S rRNA and the mcyA gene copies and microcystin (MC) concentration) were consistently correlated (based on a principal component analysis), and the highest values were found in the downstream region of the study area. This 'cyano-complex' was also positively correlated with oxygen concentration, pH and phosphate levels, but was negatively correlated with temperature and the concentrations of nitrates and nitrites. In Sulejow Reservoir in 2013 the biomass of large zooplankton filter feeders decreased along with increasing MC concentration and fish densities, while small filter feeders did not present such relationships with regards to fish densities. Fish abundance tended to decrease at stations with a lower abundance of cyanobacteria and with growing toxic genotype copies and MC concentration.

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Target strength of some European fish species and its dependence on fish body parameters

Cited by 119 publications

References 22 publications

Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Ontogenetic changes in the bathypelagic distribution of European perch fry Perca fluviatilis monitored by hydroacoustic methods

Relationships among cyanobacteria, zooplankton and fish in sub-bloom conditions in the Sulejow Reservoir

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