Use of Electronic Fish Counters for Coho and Chinook Salmon, Steelhead, and Cutthroat Trout Smolts

Appleby, Andrew E.; Tipping, Jack M.

doi:10.1577/1548-8640(1991)053<0195:uoefcf>2.3.co;2

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…Each volitional‐release pond was equipped with an FC‐3 electronic fish counter (Northwest Marine Technology, Shaw Island, Washington). The counter enumerated fish bidirectionally, and the total number of fish leaving was determined by subtracting upstream from downstream migrants (Appleby and Tipping 1991). The outlet of the volitional‐release pond was modified so fish could return to the pond if they desired; otherwise, the fish moved over dam boards into the sump and down the pond drain.…”

Section: Methodsmentioning

confidence: 99%

Adult Recoveries of Volitionally and Forced‐Released Juvenile Coho Salmon

2004

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Section: Methodsmentioning

confidence: 99%

Adult Recoveries of Volitionally and Forced‐Released Juvenile Coho Salmon

2004

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“…Fundamental mechanisms and phenomena underlying electrical impedance measurements for fish detection in freshwater were described in a recent study (Nowak and Lankheet 2022). The introduced approach extended the concept of the so-called resistivity fish counters used in stock estimation in flowing waters and in aquaculture (Appleby and Tipping 1991, Smith et al 1996, Li et al 2021. Flatfish detection in a marine environment, however, presents a broad range of different challenges.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired flatfish detection using electrical impedance measurements

Nowak,

Lankheet

2023

Bioinspir. Biomim.

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Bottom trawling for flatfish by means of tickler chains has a high ecological impact due to the continuous seabed disturbance, low selectivity and high fuel costs. This issue could be significantly mitigated by using localized startle stimuli, triggered by a detection system that selectively targets flatfishes of landable size. Flatfish, however, constitute a significant challenge for remote detection, due to their low optical and acoustical signatures. Some species of predatory fish feeding on flatfish overcome this issue by using electroreception to localize they prey, even if it is buried in bottom sediments. We take this phenomenon as an inspiration in an attempt to develop a biomimetic remote fish detection technique based on electrical impedance measurements. We constructed a detection system including a set of electrodes and a low-cost analog front-end. The electrodes were mounted on a dedicated frame and dragged above a layer of sand inside a tank with sea water and several common sole (Solea solea). An underwater camera was used to acquire video recordings synchronized with impedance data for reference. We demonstrate that fish presence below the electrodes manifests itself by changes in the measured resistance and reactance values. This phenomenon occurs even if the fish is covered with a layer of sand. The results demonstrate the potential of bioinspired remote flatfish detection, which could be highly useful for monitoring or targeted stimulation.

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“…Reddin et al [ 7 ] reported perfect agreement between Atlantic salmon counts during a 26 day long test conducted in a Canadian river. Appleby and Tipping [ 8 ] tested counting efficiency of a commercial resistivity counter for different fish species stocked at rearing ponds, comparing the readings to results of hand counts. They found the mismatch to be within 1,4% to 7%, depending on the counting rate.…”

Section: Introductionmentioning

confidence: 99%

Understanding and optimizing fish counting techniques based on electrical impedance measurements

Nowak,

Lankheet

2023

PLoS ONE

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Sustainable aquatic resources management requires reliable methods for fish detection in various environmental conditions. Herein, we study fundamental mechanisms underlying the application of electrical impedance measurements in this regard. We present results of experimental studies conducted in laboratory conditions using a low-cost impedance measurement circuit, as well as the corresponding numerical models. We also present evaluation results of a newly developed, real-time detection algorithm based on adaptive thresholding. The numerical model was validated by extracting fish tracks in 3D space from the experimental datasets, and then comparing the calculated versus measured impedance values as functions of fish coordinates in time. Numerical predictions closely resemble the experimental data. The detection sensitivity and specificity values determined for various settings exceeded 90%. Electrode width to spacing ratio is demonstrated to be a crucial parameter influencing the system sensitivity distribution. The introduced approach can constitute a framework for designing electrical impedance-based fish counting systems.

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Use of Electronic Fish Counters for Coho and Chinook Salmon, Steelhead, and Cutthroat Trout Smolts

Cited by 5 publications

References 5 publications

Adult Recoveries of Volitionally and Forced‐Released Juvenile Coho Salmon

Adult Recoveries of Volitionally and Forced‐Released Juvenile Coho Salmon

Bioinspired flatfish detection using electrical impedance measurements

Understanding and optimizing fish counting techniques based on electrical impedance measurements

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