Importance of electrode positioning in biotelemetry studies estimating muscle activity in fish

Beddow, T. A.

doi:10.1006/jfbi.1998.0917

Cited by 24 publications

(44 citation statements)

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“…EMG pulse intervals varied significantly for electrodes implanted at different longitudinal positions along the fish in a study of Atlantic salmon, suggesting that electrode placement is an important influence affecting the signals obtained from such transmitters (Beddow & McKinley, 1999). In the present study, exact measures of electrode longitudinal positions along the fish were not recorded, but they did not vary as much as the positions compared in Beddow & McKinley (1999) (0·5 and 0·7 body lengths).…”

Section: Discussionmentioning

confidence: 48%

“…The transmitters were cylindrical with outline dimensions of 5·0 1·3 cm, weight in water of 8·5 g, weight in air of 18·4 g and signals within the 142·117-142·305 MHz range. Similar transmitters did not affect maximum sustainable swimming speeds in Atlantic salmon of mean body lengths 44-48 cm (Beddow & McKinley, 1999). The EMG signals emitted from contracting musculature were detected by a pair of flexible surgical stainless steel electrodes via a gold rod (18-carat gold, 7 1 mm), which was attached to each electrode to hook and hold the electrodes in the muscle.…”

Section: Telemetry Equipmentmentioning

confidence: 99%

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Radio‐transmitted electromyogram signals as indicators of swimming speed in lake trout and brown trout

Thorstad

Økland

Koed³

et al. 2000

Journal of Fish Biology

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Swimming speed and average electromyogram (EMG) pulse intervals were highly correlated in individual lake trout Salvelinus namaycush (r 2 =0·52-0·89) and brown trout Salmo trutta (r 2 =0·45-0·96). High correlations were found also for pooled data in both lake trout (r 2 =0·90) and brown trout of the Emå stock (r 2 =0·96) and Laerdal stock (r 2 =0·96). The linear relationship between swimming speed and average EMG pulse intervals differed significantly among lake trout and the brown trout stocks. This successful calibration of EMGs to swimming speed opens the possibility of recording swimming speed of free swimming lake trout and brown trout in situ. EMGs can also be calibrated to oxygen consumption to record energy expenditure. 2000 The Fisheries Society of the British Isles

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Section: Discussionmentioning

confidence: 48%

Section: Telemetry Equipmentmentioning

confidence: 99%

Radio‐transmitted electromyogram signals as indicators of swimming speed in lake trout and brown trout

Thorstad

Økland

Koed³

et al. 2000

Journal of Fish Biology

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“…Indeed, the large gold-tipped electrodes may record a large proportion of the myotome, and sometimes multiple myomeres. Variation in depth from the skin and distance from the lateral line, where the gold rods are positioned, may affect to what extent they record EMGs from red or white muscle fibres, or both (Beddow and McKinley, 1999;Thorstad et al, 2000). Also in our study, variability of EMG at each velocity stage can be interpreted considering the possible cross-interference between the signals emitted by the two muscle types.…”

Section: Discussionmentioning

confidence: 90%

Use of muscle activity indices as a relative measure of well-being in cultured sea bass Dicentrarchus labrax (Linnaeus, 1758)

Lembo¹,

Carbonara²,

Scolamacchia³

et al. 2007

Hydrobiologia

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Aquaculture of sea bass is widely spread in the Mediterranean and employs a variety of husbandry protocols that need to be evaluated in terms of fish well-being. Behavioural tests can be used as operational indicators of short-term stress, because changes in swimming performance and/or muscle activity (e.g. electromyograms) can be interpreted as response associated with a wide variety of stressors. Diagnostic procedures, based on physiological telemetry, will thus enable appropriate mitigative strategies to be implemented to ensure the well-being of cultured fish. The objective of this study was to examine the contribution of two muscle types to the swimming activity of sea bass (Dicentrarchus labrax, L. 1758). Hard-wire technology was used to 'fine-tune' measures obtained using a physiological transmitter. Fine-tuning showed that the aerobic muscle displayed an increase in recruitment of muscle fibres relative to increasing swimming speed up to 0.6-0.7 ms -1 of the U crit , where the anaerobic (white muscle) activity started to exponentially augment with swimming speed, reaching up to~7 times its initial value. Intensity of electromyogram signals were described by logarithmic (red muscle): y = 0.5922Ln(x) + 1.2251 (R 2 = 0.9906) and exponential (white muscle): y = 0.0977e 2.4723x (R 2 = 0.9845) relationships. Fine-tuning indicated that the two muscle types in the sea bass are involved in fuelling swimming activity below the U crit . Thus, scope for activity is not supported solely using aerobic metabolism, though the red muscle powers the majority of the swimming ability. Measurement of U crit displayed an average value of 3.43 BLsec -1 (SE = 0.12). Associated EMG values measured during the forced swim trials using an implanted bio-sensitive radio transmitter showed that EMG's intensity increased, on average, 3.2 times between 0.2 msec -1 and the U crit velocity (~1 msec -1 ).Above EMG values were fine-tuned using estimates obtained from direct monitoring of the red and white musculature. Overall, the results demonstrated that the scope for activity, previously thought to represent only aerobic metabolism, is composed of both aerobic and anaerobic pathways. Fine-tuning of physiological transmitters to measure activity of free ranging fish can therefore Guest editors: be utilised to monitor the proportion of the scope of activity utilised in response to external stressors. This proportion and the level of compensatory ability remaining could represent a measure of well-being in cultured fish.

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“…They are consequently related to the energetic demand of an individual. Typical EMG signals, generated by a representative red muscle myomeres, are highly correlated with oxygen consumption (Cooke et al 2000) and muscle activity (Beddow & McKinley 1999). Fish metabolic rate is usually directly expressed by oxygen consumption-linked indexes in the literature.…”

Section: Introductionmentioning

confidence: 99%

Modelling swimming activities and energetic costs in European sea bass (Dicentrarchus labraxL., 1758) during critical swimming tests

Zupa

Carbonara

Spedicato

et al. 2015

Marine and Freshwater Behaviour and Physiology

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Muscular activity patterns in red and white muscles linked to oxygen consumption were studied during critical swimming tests in the sea bass (Dicentrarchus labrax Linnaeus 1758). The species is one of the most important for Mediterranean Sea aquaculture. A sigmoid model was used to fit both the oxygen consumption and red muscle activity while the white muscle activity pattern was described by an exponential model. Red muscle reaches an activation plateau close to critical swimming speed mostly due to the oxygen diffusion velocity in tissues. The exponential activation of white muscle appears to be linked to short and sudden periods of great energy need to cope with adverse conditions such as predation and escape. Both oxygen consumption and muscular activity were found to be size dependent. The bioenergetics of sea bass was modelled based on fish mass and swimming speed to predict the minimum and maximum speed as well as the mass-specific active metabolic rate and standard metabolic rate. An important finding was that contrary to other well-known species, swimming at subcritical speeds in sea bass involves both red and white muscle in different proportions.

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Importance of electrode positioning in biotelemetry studies estimating muscle activity in fish

Cited by 24 publications

References 0 publications

Radio‐transmitted electromyogram signals as indicators of swimming speed in lake trout and brown trout

Radio‐transmitted electromyogram signals as indicators of swimming speed in lake trout and brown trout

Use of muscle activity indices as a relative measure of well-being in cultured sea bass Dicentrarchus labrax (Linnaeus, 1758)

Modelling swimming activities and energetic costs in European sea bass (Dicentrarchus labraxL., 1758) during critical swimming tests

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