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Gas exchange in bony fish
· Fish have a
watertight and
therefore gas-
tight, outer
covering.
· Relatively large
animals
· Therefore small
surface area:
volume ratio.…read more

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Gas exchange in bony fish
· Fish have developed a specialised
internal gas exchange surface: gills…read more

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Gills
The gills: The gills are composed of a gill arch
(which gives the gill rigid support), gill
filaments (always paired), and secondary
lamellae (where gas exchange takes place).…read more

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GILL STRUCTURE NOTES
·Gills are covered by a bony operculum.
·Each gill has 2 rows of gill filaments
·Each gill filament has a set of secondary
lamellae/gill plates.
·The surface of the gill plate/lamella is a
single cell thick.
THIS IS THE GAS
EXCHANGE SURFACE.…read more

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