aquarium fish that are gill rakers…

[Magnum Man76 190]

I noticed this adaptation most in my Kisser Gourami ( Helostoma temminckii ) when I add Bacter AE to the tank, the kisser swims into the cloud, and can be seen sucking in a huge amount of it, before it disperses into the tank, filtering through it’s gills… anyone knowingly keeping gill rakers ( there are several ) and have you ever witnessed this, in your tanks???

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[Tomsfish34 33]

I used to watch my rams feed their fry through their gills.
It was amazing to watch the mom chew up food and shoot it out her gills to a swarm of fry right behind her.
Not all did this and I don't believe it alone was enough to support the fry but spectacular, nonetheless.

 

[GaryE36 34]

It's really common. The whole old corydoras group, all Geophagus (eartheaters), all of their relatives (Apistogramma, Mikrogeophagus), African Chromidotilapia, so many fish I've barely scratched the surface with this list.

Pelvicachromis sometimes do what @Tomsfish described, so it's an intercontinental trick as ancient as the fish stories themselves.

 

[Rusty_Shackleford75 190]

There are many genra of cichlid gill raker feeders.
Among the sandsifters like Geophagus that GaryE mentioned. Also Satanoperca, Gymnogeophagus, Acarichthys heckelii, Cribroheros altifrons. From Africa Lethrinops and Aulonocara, (Peacocks), Xenotilapia, Enantiopus.
Then there are open water gill rakers thar sift plankton and other invertebrates out of the open water. These include Cyprichromis, Paracyprichromis, and Copadichromis borleyi.