Influence of artificial magnetic fields upon the behavior of the shrimp Litopenaeus vannamei (PENAEIDAE) and fish catch using fishtraps / InfluÃncia do campo magnÃtico artificial sobre o comportamento do camarÃo Litopenaeus Vannamei (PENAEIDAE) e a captura de peixes na pesca com covos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This work focuses on the behavior of marine organisms (fishes and shrimps) when submitted to artificial magnetic fields and on the use of this behavior as a mechanism to attract or to move away these organisms to/for specific areas. Although the geomagnetic field has existed in the planet a long time before of the beginning of the life rise little is known about its interaction with the living beings. This field constitutes a directional information guide, and it is easily accessible and uniform that animals can use in its migrations. Species of sea turtles, birds, fish, mammals, amphibians, insects, clams and crustaceans are sensible to the geomagnetic field. The goals of this study were, evidence behavior generated by artificial magnetic fields in different intensities on Litopennaeus vannamei shrimp under laboratory conditions and on some important economically fishes (in the natural environment). As well as idealizing the construction of a pair of dimensioned magnetic coils for tests magneto biology behavior in small marine animals, being useful such equipment, not only for this work but also for other relates to the subject. The results gotten with the tests using 17 fish-traps (marked and not marked with a permanent magnet of 480 Gauss) in coastal environment, had demonstrated the existence of significant numerical differences in the capture between each fish-trap. Catches in fish-traps with magnetos were significantly higher them that in fish-traps without magnetos. The results generated in the laboratory, with the use of a pair of circular coils and four aquariums (four treatments and a control, with 20 shrimps each), had evidenced the reduction of the activity of the L. vannamei when exposed to a 60μT and its complete paralysis for fields bigger than 150μT

ASSUNTO(S)

fish-traps shrimp litopenaeus vannamei campo magnÃtico artificial biomagnetism comportamento animal magnetobiologia biomagnetismo magnetismo animal camarÃo litopenaeus vannamei pesca com covos oceanografia magneto biology animal behavior oceanografia fÃsica physical oceanography, artificial magnetic fields, animal magnetism

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