i think if im not mistaken it is blood in the sperm of the fish
red algae can be when you scratch it and then when you scratch it to much there can be a problem!
Many fish eat algae, it depends on which type of algae. But the fish that do eat algae are catfish, red tailed fish, Florida flag fish, and plecos.
Some algae in the red tide contains a poison that can kill fish.
Animal that eat red algae are animals that eat plants.
Warm sunny weather causes algae to photosynthesize and grow. In the case of a pond turning red, the algae in question would be red algae
If you are referring to the Red Tide, then, it is a form of algae called "Gymnodinium breve". Not everyone agrees on the reason the algae booms, and causes the water to appear red, but it is said to be a natural phenomena and it's not good for the ocean life or people. you shouldn't eat fin fish that are from a red tide area, red tide produces potent neurotoxins.
Small algae eating fish with what appears to have red and silver stripes resembling the flag for which it gets its name.
fish...
The useful effects of algae is that it provides oxygen for various living things. Algae is also a food resource for humans and fish. Algae can become harmful if they produce toxins. Too much algae in the water can kill fish because the algae consumes a great amount of oxygen and can block the sunlight from reaching underwater.
Fishermen, whoever owns a worm farm and owners of game fish in tanks
No
Algae: Green algae, even red algae but phycoerythrin over populates it which gives the red algae its red color.