Language	Term	Definition	See also
English	depression	In ichthyology, usually a pit or a trough, dug in the river bed or sea floor in preparation for, or during, spawning. Eggs are laid or larvae are hidden in the depression.	Redd spawning larvae
English	moat and depression	Linear or rounded depression on a reef top; reef top subtidal feature characteristically immediately inshore of algal ridge.	reef top algal ridge reef
English	trough	A long depression of the sea floor normally wider and shallower than a trench.	sea floor trench
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