Electricity in fish research and management : theory and by W. R. C. Beaumont

By W. R. C. Beaumont

Electricity in Fish study and administration, second Edition presents a entire dialogue of the makes use of of either electrical energy and electric rules in fishery administration and study. It covers electrical fishing (including conception, gear, info research and useful components affecting efficiency), fish obstacles, fish counters and fish welfare issues.

The ebook concentrates on electrical Fishing (or Electrofishing); an the world over authorised and primary method for sampling fish. during the last 50 years electrical fishing has turn into a regular approach for fishery reviews and administration e.g. constructing inhabitants densities and abundance. although, as a result of the strength dangers of the strategy (both to operators and fish) there's a carrying on with have to enhance and advertise top perform guidelines.

The writer has studied fish ecology for forty years and is aware the necessity for info that reaches out to all degrees of realizing within the box. prior books in this topic have both been collections of clinical papers and/or technical experiences or extremely simple guide manuals. during this ebook idea and perform is defined utilizing non-technical language and easy equations. It brings intensity in addition to breadth in either details and rules at the back of the equipment and may be a useful instrument to either fisheries managers and researchers.

Although the ebook is aimed toward undergraduates, the transparent clarification of the criteria implies that the ebook is acceptable for all degrees of practitioners.

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Note: There was no response at 10 Hz, 10% duty cycle for rainbow trout. Adapted from Davidson (1984). 20 The effect of increasing pulse frequency on applied power. 2 Pulse width Pulse width is, as the term suggests, the duration of the individual pulses of electricity. There are two ways of expressing this factor. •• Pulse width, expressed in milliseconds (ms) duration that the current is flowing •• Duty cycle, expressed as the percentage (%) time within one cycle that the current is flowing. 21).

1). 24 The power needed to energise with DC one 400 mm anode (and a 3000 mm braid cathode) at different water conductivities (from an AC generator). 1 Power factor If using an AC generator to energise a DC (or pDC) circuit, inductance and capacitance issues may result in more power being required than circuit theory would predict. This difference between ‘apparent power’ (the power actually required) and the ‘real power’ (theoretical) is called the ‘power factor’ (PF). It means that a correction (that will increase the power demand) needs to be added when assessing the theoretical power required.

No oscillograph traces) makes it difficult to identify the studies where these transients may be present. Even where voltage levels are recorded, if these are presented for RMS voltage levels instead of peak voltage levels, the effect of the transients will not be adequately recorded. In studies using equipment producing transient spikes, if peak voltages are back‐ extrapolated from mean voltages (Thompson et al. 1997), considerable errors may occur. The effect of these transients is largely ignored in discussions on waveform and electric fishing effect.

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