The statement that is NOT true of the blacktip reef shark is:
3) It occupies Trophic Level 1 on this food chain.
Blacktip reef sharks are typically considered to be higher up in the food chain, serving as tertiary consumers or apex predators depending on the specific ecosystem. Trophic Level 1 usually corresponds to primary producers (like plants and phytoplankton), not top-level predators like blacktip reef sharks.