Fish Health - My Fish Jumped!

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Description
One of your fish has decided to try his hand at being an air-breather. You've found him lying there, gasping or maybe not moving at all. He's likely to be covered with dirt and there may be a trickle of blood and mucus coming out from under his gill covers. In short, Mr. Fish is having a really bad day.

What Causes It
Koi jump for a variety of reasons... Some of these reasons seem to be known only to the koi themselves but others are indicative of something different or wrong with the environment. I've listed a few of the more common reason below:
Symptoms
Fish is out of water.

Confirming Evidence
None needed. :)

Recovery Protocol #1: Fish Momentarily Out Of Water
Conditions: Fish apparently just jumped. You either saw or heard him go, he is still flopping and gasping strongly, and he hasn't really hurt himself. Recovery Protocol #2: Fish Has Been Out A While
Conditions: Fish is limp, barely gasping, may have red streaks on his fins, slime coat is getting sticky.

Note: If you have access to injectible drugs (dexamethasone), use them. Dexamethasone (2 mg/mL) is used to combat shock in mammals and is equally useful in fish. Dosing is at the rate of 0.1 ml per 3 inches of fish length. Follow-Up For Jummpers
Jumpers need to be checked daily for up to three weeks for late-breaking signs of infection. From what I've seen, five days in salted water gives the fish ample time to recover and regenerate lost slime coat... but this isn't gospel. If the fish is subsequently re-stressed, any number of problems are possible. Your best defense is careful, daily visual observation.

Prevention Of Future Jumps
Fish which have jumped may attempt to do so again. After correcting any environmental stressors, consider netting the pond to keep the fish in for a few weeks. Some fish simply like to jump so its entirely possible you will need to keep the pond covered until this behavior subsides or is spontaneously terminated by the fish. It may also be wise to add a small amount of salt (0.1%) and push the KH toward 120 ppm. These actions will help osmoregulation and will stabilize the pH, reducing stress and possibly enticing the jumpers to stay wet. During the spring when winter emergence and mating behaviours are present, it is prudent to net the pond regardless of past experience.

Reproduced with kind permission from www.click2roark.com