Several years ago I had a "hatch" of fish in my pond. Some of these turned black and some were your standard orange & white. These black ones grew at an alarming rate compared to the others.Black ones are about 12", while the others are about 6".Last month I noticed one of the black ones seemed to be prego ....but it kept growing & bloating. It struggled to swim down into deeper water,as it was too buoyant.Now I noticed another black one showing the same characteristics. Had no success trying to catch them (once my fish see my net,they become uncooperative). Now with the colder temps they both happened to be close to the edge & easily netted. Here is a pic of the worst one.Almost as if the spine is arching. I decided to let them fertilize my garden, but when I dumped them out of the net in the garden ....they burst an amber fluid. Any thoughts would be appreciated.