Although we do not see a clear trend of selection against non-adaptive skeletal structures or reduction of the density of certain bones associated with increasing depth in rattails, we do see what could be a complex system where very specific adaptations associated with buoyancy occur mainly at the species level.
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Bone Density Variation in Rattails (<i>Macrouridae, Gadiformes</i>): Buoyancy, Depth, Body Size, and Feeding.
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The sentences
In all three species, they found an increasing trend of bone density with age and length.