Journal Article

The cave environment influencing the lipid profile and hepatic lipogenesis of the fish Ancistrus cryptophthalmus Reis, 1987 (Siluriformes: Loricariidae)

Bastos, V.A.A., Ferreira, R.L., de Carvalho, D.C., Pugedo, M.L. and Pinto, L.D.A.

Record Number:
2997
Year:
2013
Journal:
International Journal of Speleology
Pages:
15-23
Volume:
42
Abstract:
The metabolism of hypogean organisms is frequently molded by the cave environment traits, especially food scarcity. The aim of the present work was to evaluate the influence of such environment on lipid composition and hepatic lipogenesis in the fish Ancistrus cryptophthalmus. For this, the species was compared to an epigean population of the species. A greater accumulation of total lipids was observed in the cave-dwelling fish (18.36 g/100 g tissue) compared to the surface fish (14.09 g/100 g tissue). The muscle fatty acid profile also varied between the populations. Arachidonic acid was only detected in the epigean fish, while docosahexaenoic acid was present in the cave fish. In the lipid profile of Ancistrus cryptophthalmus there was a higher proportion of saturated fatty acids, followed by monounsaturated and polyunsaturated fatty acids; Ancistrus sp. showed a predominance of monounsaturated fatty acids. Significant differences were also observed in the activities of the hepatic enzymes glucose-6-phosphate dehydrogenase and malic enzyme. The activities of these two enzymes were greater in the epigean animals. The differences could be related to different food availability observed in the two environments. An ecotone zone was observed, located next to the entrance of the Lapa do Angelica cave (Goias State, Brazil), where the fishes showed characteristics that were intermediate between those of hypogean fishes from deeper within the cave, and the epigean population. It could be concluded that the characteristics of the cave environment significantly influenced the composition of muscle fatty acids and lipogenesis in the hypogean fish Ancistrus cryptophthalmus.
Times Cited:
1
Related Records:
Reis, R. E. (1986)
Uma nova especie de Ancystrus de caverna: o primeiro Loricariidae cego (Pisces, Siluriformes)
Reis, R. E. (1987)
Ancistrus cryptophthalmus sp. n., a blind mailed catfish from the Tocantins river basin, Brazil (Pisces, Siluriformes,Loricariidae)
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Trajano, E. and de Souza, A. M. (1994)
Behaviour of Ancistrus cryptophthalmus an armoured blind catfish from caves of central Brazil, with notes on syntopic Trichomycterus sp. (Siluriformes, Loricariidae, Trichomycteridae)
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Sabino, J. and Trajano, E. (1997)
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