Final answer:
Some populations are not considered as highly susceptible populations (HSPs).
Step-by-step explanation:
The highly susceptible populations (HSPs) are those populations that fluctuate greatly from year-to-year or are brought to very low numbers from which they cannot recover. In the given information, the population mentioned as belonging to one of the categories with considerable gaps in knowledge or not meeting the criteria for other categories is not considered as one of the HSPs.