Four substrata were offered to groups of adult Nile tilapia Oreochromis niloticus (one male and two females) simultaneously: pure sand, a mixture of sand and shells, stones and no substratum. The results showed that males chose to dig nests in a lighter and more homogeneous substratum.
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| http://dx.doi.org/10.1111/j.1095-8649.2010.02754.x | DOI Listing |
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