By W. R. C. Beaumont
Electricity in Fish study and administration, second Edition presents a accomplished dialogue of the makes use of of either electrical energy and electric ideas in fishery administration and examine. It covers electrical fishing (including conception, apparatus, 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 known approach for sampling fish. during the last 50 years electrical fishing has turn into a typical strategy for fishery stories and administration e.g. setting up inhabitants densities and abundance. besides the fact that, because of the strength dangers of the strategy (both to operators and fish) there's a carrying on with have to advance and advertise most sensible perform guidelines.
The writer has studied fish ecology for forty years and knows 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 medical papers and/or technical studies or extremely simple guide manuals. during this e-book concept and perform is defined utilizing non-technical language and easy equations. It brings intensity in addition to breadth in either info and rules in the back of the tools and will be a useful instrument to either fisheries managers and researchers.
Although the publication is geared toward undergraduates, the transparent clarification of the criteria signifies that the booklet is appropriate for all degrees of practitioners.
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Extra info for Electricity in fish research and management : theory and practice
Few data exist, though, detailing the gradients that are required. cm−1 for DC. cm−1 and were constant above 50 Hz. Experience has shown that minor changes in physical parameters within the stream have little impact upon the efficiency of a suitably set‐up pDC system, thus making the efficiency of the waveform more uniform than DC both within and between sites. 2). Research has shown, however, that pDC is more stressful and causes more injuries than DC (Lamarque 1967, 1990, McMichael 1993, Dalbey et al.
Working on excised fish muscle, Stewart (1990) found that as duration (of pulse) is increased, smaller (lower voltage) 40 Chapter 4 pulses produce the same tension in the muscle. All of these findings could relate to Kolz’s Power Transfer Theory (PTT), where fish require a minimum power to elicit a response. However, Kolz (1989) uses peak values of power transfer, and therefore (according to the PTT) adjusting pulse width (which affects mean power) should not change the fish’s reaction. Miranda and Dolan (2004), investigating ways to induce narcosis rather than (damaging) tetanus in fish, found that duty cycles of 10–50% required the least power to immobilise fish.
Kolz (1993) gave some empirical equivalent resistance values for different anode shapes, and Beaumont et al. 2) and different designs of cathode. 3). For a 25 mm width copper braid, there was a power law relationship with increasing length.