Dying koi

[Aprilgrace]

I have had my pond for years and the only fish I have lost are due to a large blue heron who stabs them. I’m now losing one a week and they swim and eat normally. This morning I had a floater with this wound. I did not see this yesterday but it looks old. Any ideas?

 

[Jhn]

Looks like a stab wound possibly from a heron at first glance.Fish can survive the initial attack and then succumb to infection.

How large is your pond? How many fish and their size and species? Symptoms of the dy8ng fish besides the one pictured? Filtration system?

 

[j.w]

@Aprilgrace

A net raised up high about 4ft off the ground is what I use. I let the net sides hang down and attach the bottom w/ s hooks to a short wire garden fence and clips at the top where it attaches to the posts. The s hooks are easy to remove when I want to lift the net to enter the pond. Working great for many years. Not as pretty but I want my fish safe!