What are these?

[Marc88]

 

[samnaz]

isopods not sure of exact species

 

[Tahoe61]

isopods not sure of exact species

Same.

I would examine any fish.

 

[Marc88]

Thank you

 

[v3v3]

here : looks like Cironalid Isopod and examine your fish.

 

[vetteguy53081]

I think it is a Sphaeromatid as the eyes are on the side of the head not the top, it could also roll like a roly poly and May attach to fish. They’re most active at night