Thread: Flashing?

Hi everyone. I'am new to Keeping Koi. Heard alot about fish flashing what is this? What does it mean?
Also Have this black alge on floor and walls of my pond How do i get rid of it safely.

Cheers for any help

Flashing is where a fish rubs itself against something (wall, bottom drain, etc) as a reaction to something irritating it, eg parasite or a water quality issue. It's a fast purposeful motion, and can often involve the fish twisting as it passes whatever it's trying to rub against, I guess giving a glimpse or flash of the fish to the watching koi keeper, maybe where the phrase comes from...

The algae I'm sure is nothing to worry about, it will almost certainly be playing a beneficial role in your pond's ecosystem. People tend to remove hair or blanket weed as it's unsightly and can clog filters when it breaks away from the sides (or nibbled by the inhabitants).

Hi thanks for the info. will do a test of the water and see what comes up. I have cover over my pond. Just never had this black alge before in my pond. Just would like to know if harmful to the fish.
thanks again

Hi
ihave anew pond, the 15-23 cm fish have been in about 4 weeks. I notice a little flashing, with some fish after feeding. Is this normal or a problem.

I have the gear for doing a scrap and test, but the fish are hard to catch?

Thanks for reply

info
Nexus 220., gravity feed bottom drain, Pond 2500 gals fibreglass, evaqua 90 air pump, lead to nexus and one air stone, water dues have current.
water been in 10 weeks, fish in 4 weeks

temp 15.9 Readings 8/5/22

nh3 0.1
no2 0
ph 8
po43- (phosphate) 2



Will be testing today, after cleaning filter.

Originally Posted by Lindosbay

Thanks for reply

info
Nexus 220., gravity feed bottom drain, Pond 2500 gals fibreglass, evaqua 90 air pump, lead to nexus and one air stone, water dues have current.
water been in 10 weeks, fish in 4 weeks

temp 15.9 Readings 8/5/22

nh3 0.1
no2 0
ph 8
po43- (phosphate) 2



Will be testing today, after cleaning filter.

but

unfortunately I cannot catch the little so and so,s! Need a bigger net!

Job done, at last,.
tests show mainly tric with single skin fluke.

seeing my fish doc on Wednesday for the treatment