New programmable electrofishing device for use in aquaculture

Journal ar
North American Journal of Aquaculture
  • Volumen: 74
  • Número: 4
  • Fecha: 19 septiembre 2012
  • Páginas: 468-476
  • ISSN: 15222055 15488454
  • Tipo de fuente: Revista
  • DOI: 10.1080/15222055.2012.690828
  • Tipo de documento: Artículo
The new equipment described here was developed in response to a shortcoming in the technology available for electrofishing marine species. The system supplies a need that exists in commercial operations, and also allows research into the effect of the waveform on the quality of the meat. The equipment is capable of generating any kind of waveform, identifying the environment the electrodes are in, and logging the voltage and current values that are applied to kill the fish. Although it has been designed in the context of electrofishing for tuna, it is perfectly compatible with electrofishing in freshwater. The system is composed of two interacting parts: a software section and a hardware section. The software is capable of determining the relationship of each of the electrical wave parameters with the final quality of the meat. The electrical hardware main constituent is a full bridge with an inductor-capacitor (LC) filter. The effectiveness of two different types of control for this kind of converter is compared: one being a "feedback" control, and the other a "feedforward" control. This equipment has been tested under natural conditions using three different waveforms, selected on the basis of our previous tuna electrostunning experience. These are: high-frequency pulsed DC, low-frequency pulsed DC, and low-frequency, decreasing exponential AC. Of the tested waveforms, low-frequency, decreasing exponential AC showed the best results as far as flesh quality was concerned. The system showed, in all cases, a high degree of reliability and safety. © 2012 American Fisheries Society.

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