Final answer:
Leviticus 11:9 indicates that in order for the Israelites to consider water creatures as clean for consumption, they must possess both fins and scales.
Step-by-step explanation:
The requirements for water creatures to be considered permissible for consumption according to Leviticus 11:9 in the Bible are that they must have both fins and scales. This dietary restriction is a part of the food laws detailed in the Hebrew Bible that denote the cleanliness of certain animals for eating. The prohibition of certain foods, such as shellfish, which lack both fins and scales, is thought to come from their transgression of conventional categories, as they are sea creatures but do not conform to the expected characteristics of fish that were deemed clean.