Final answer:
The question cannot be answered without more information about the size of the tray and the space required for each fish.
Step-by-step explanation:
The question is asking how many fish can be put in one UHC tray. Unfortunately, the provided information about a pond stocked with fish and genetic testing is not directly relevant to answering this question. In order to determine how many fish can be put in one UHC tray, we would need additional information such as the size of the tray and the space required for each fish. Without that information, we cannot accurately determine the answer to this question.