Electrical activity of the broadhead catfish Clarias macrocephalus during paired aggressive–defensive interactions: effects of illumination and chemical alarm signalстатья

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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.

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1. 2013-1_Kasumyan_et_al._Clarias_JI.pdf 2013-1_Kasumyan_et_al._Clarias_JI.pdf 848,1 КБ 9 октября 2013 [KasumyanAO]
2. 2013-1_Kasumyan_et_al._Clarias_JI_1.pdf 2013-1_Kasumyan_et_al._Clarias_JI_1.pdf 848,1 КБ 9 октября 2013 [KasumyanAO]

[1] Electrical activity of the broadhead catfish clarias macrocephalus during paired aggressive–defensive interactions: effects of illumination and chemical alarm signal / A. O. Kasumyan, V. M. Ol’shanskii, D. S. Pavlov et al. // Journal of Ichthyology. — 2013. — Vol. 53, no. 1. — P. 79–94. We studied the effects of illumination and alarm pheromone on emition of specialized electric discharges in the broadhead catfish Clarias macrocephalus (Clariidae, Siluriformes) during aggressive–defensive interactions. The discharges were recorded with a special hardware in two adult fish of a similar size placed into an aquarium, during a period of 24 h, under alternating 30minlong light (700 lx) and dark periods. The electrical activity of the broadhead catfish was found to be higher in the dark than under the light; by the end of the trial, the frequency of electrical discharges gradually decreased. The overall number of discharges recorded in different pairs of the fish was significantly different, which is evidence of individual variability in the electrical activity. Changes in the illumination regime in many cases increased the emition of electrical discharges, which could be a result of a stressresponse. However, the stimulation of the fish by alarm pheromone (extract of the skin, 0.5 g/l) caused no pronounced changes in the electrical activity. It is supposed that aggressive motivation caused in the broadhead catfish by the presence of another individual of the same species dominated over the defensive response initiated by the alarm pheromone and, thus, dominated in the development of the electrical response. [ DOI ]

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