Final answer:
Yonatan wants to use the fish fable for his survey of the people of Tel Aviv to gauge their environmental knowledge.
Step-by-step explanation:
Yonatan wants to use the fish fable for his survey of the people of Tel Aviv in order to gauge their environmental knowledge. By using the fish fable, Yonatan can assess the respondents' understanding of the ecological impact of fishing and their awareness of the importance of preserving fish populations. This information can help Yonatan gather data on the respondents' environmental attitudes and behaviors towards fishing practices, which can be valuable for environmental research and policymaking.