Yes it does have a buoyancy system.
The coelacanth (Latimeria spp.) is completely oil-filled (it has no air sinuses at all) and the swim bladder is filled with a fatty lipid. The oil is slightly positively buoyant and this counteracts the weight of the fish. These two factors enable the fish to rise and descend through a considerable depth range without suffering any adverse effects.
Gills
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no
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yes, the coelacanth is older than the dinosaurs.
You can catch a coelacanth when it is raining or snowing
The scientific name for the coelacanth is Latimeria chalumnae.
The living coelacanth, Latimeria spp., can reach a total length of 2 metres.
Yes, if the buoyancy is greater.
Buoyancy
The Coelacanth lives in the Indian Ocean, ranging anywhere from South Africa to India, and Indonesia.
When a system is in isostasy, downward gravity and upward buoyancy are balanced.