Selective behaviour of a tench, Tinca tinca (L.), stock
in different light–substrate combined conditions |
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Authors: | JOSÉ MARTÍN GALLARDO José Carlos Escudero García Encarnación García Ceballos-Zúñiga Juan José Pérez-Regadera Pérez |
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Institution: | (1) Ecology Area, University of Extremadura, Avda Elvas s/n, 06071 Badajoz, Spain;(2) Cento de Acuicultura Vegas del Gauadiana, Junta de Extremadura, Ctra. Badajoz-Talavera s/n, Badajoz, Spain |
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Abstract: | Two physical factors light or substrate (fibre glass, artificial vegetation, gravel and mud) were determined in a 24 m long
artificial channel to have importance on the distribution of 33 tench 2+, mean size 11.8±0.9 cm S.L. For this purpose in five
trials tench could select between the half of the channel occupied by their preferred light intensity (inferior to 10 lux)
combined with the less preferred substrate (fibre glass) or the half with the combination of one of the substrates considered
and higher light conditions (40 lux). Fish preferred, with a 100% frequency, the optimal light-less preferred substrate when
compared with the combinations fibre glass, gravel and mud. When artificial vegetation was the substrate considered, tench
selected the combination preferred substrate – non-optimal light intensity with a 98.26±2.68% frequency. This result changed
when increasing light intensity up to 150 lux, avoiding the shading effect. We demonstrated that light has a bigger influence
than substrate in juvenile tench habitat selection under controlled conditions. |
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Keywords: | Light intensity Niche Physical parameters Preferences Substrate Tinca tinca |
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