Here is some more general information about red shiners (Cyprinella lutrensis)
NOTE Numerous areas of the United States consider the red shiner as an invasive specie that when added or introduced to wild fish communities, where the red shiner does not exist, can cause disruptions to the native fish species by crowding or out-competing the native minnow species. It is not a good idea to introduce red shiner to a fish pond that connects in any way directly to a stream.
Invasive species website. See the list in this link if red shiner is reported in your state waters.
https://www.cabi.org/isc/datasheet/86206USGS Description and picture
https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=518http://www.fishpondinfo.com/shiner.htmRed shiners usually breed over sunfish nests and vegetation even though the sunfish will eat them. Males guard the sunfish nest area. They may fan away the gravel in a spot. Eggs may also be put in the crevices of rock piles, logs, etc. The parents release eggs and sperm over the area where they fall to the ground and stick. Females can lay up to 400 to 600 eggs. In a tank, red shiners may spawn in a dish of gravel. While they sort of stash eggs, they do not give them any care after laying them and will eat them.
The breeding males are a silvery blue with dark red stomachs and sometimes a green stripe across their bodies. Their fins turn red, and they have a blue triangular patch behind their heads. The males also get breeding tubercles on their mouth and head. Breeding males may have a black tip on their dorsal fins. Breeding females are fatter and less colorful.
Breeding info from NANFA
http://forum.nanfa.org/index.php/topic/17597-how-to-breed-red-shiners-in-an-aquarium/Spawning video from YouTube. I think early in the video both of those fish are males then a drab color female appears where they are likely spawning above gravel.
https://www.youtube.com/watch?v=jmz2deZHn5MGreat pictures and here Red Shiners(Cyprinella lutrensis) are called Rainbow Dace.
https://www.reef2rainforest.com/2016/09/22/friday-photospread-flash-falloff-on-rainbow-dace/Alberta Canada concern of Red Shiner with good red fin pictures
https://abinvasives.ca/wp-content/uploads/2018/05/FS-Red-Shiner.pdfTopic from England
https://www.practicalfishkeeping.co.uk/features/red-shiner-cyprinella-lutrensis/Intense color from Germany
https://www.aquariumglaser.de/en/fish-archives/cyprinella_lutrensis_notropis_lutrensis__en/
