Fig. 1
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Nematode densities after 24 h exposition in control aquaria without fishes (grey bars) or in aquaria with two Corydoras aeneus (25–30 mm) catfishes (black bars). Values are means ± SD. Aquaria contained 1.2 L of sandy sediment spread on a surface of 600 cm2. Nematode species offered: Poikilolaimus sp. (Poikilo), Caenorhabditis elegans (Celegans), Panagrolaimus cf. thienemanni (Panagro), and Panagrellus redivivus (Panagre).
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