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Glossary G

gill
The respiratory organ of most aquatic animals that breathe water to obtain oxygen, consisting of a filamentous structure of vascular membranes across which dissolved gases are exchanged.
an organ (as of a fish) for obtaining oxygen from water.
glide
A shallow stream reach of uniform depth, with non-turbulent flow, flowing over similarly sized substrate.
gravel
Substrate particles between 2 and 64 mm in size, good for spawning.
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