He was 23, had just set up his own carpentry business and was doing well. He was learning plumbing, carpentry and tradesmen's skills. But don't ignore plumbing or carpentry - there are skill shortages in the trades that will worsen. There are vacancies across the UK in roles including carpentry, plumbing and welding.
There are several reasons why koi jump out of the water. One of the most common is parasites. The parasites cause itching and pain. The fish will leap out of the water and also rub on things in the pond in an attempt to escape the itching. If your koi have parasites, you can treat with a medication called praziquantel. It is sold on pet stores and pond supply stores. Koi also will do a lot of leaping out of the water when they are spawning. Lot of chasing goes on. The females may get tired of it and leap out. Males trying to win the females may also jump. Finally, they may jump out because they are scared.
When koi eggs are fertilized, they cling to pond plants for three to four days. Once they hatch, they sink to the bottom of the pond. These baby koi are called koi fry. Once released from their yolk sacks, the baby koi take cover in pond plants. Baby koi do not typically need to be fed in the first few days.