The answer is secondary consumer.
A trophic level of an organism shows its position in a food chain:
1. Producers, such as plants and algae, produce their own food and thus are the base of every food chain.
2. Primary consumers eat producers. They are herbivores that eat plants.
3. Secondary consumers eat primary consumers. They eat herbivores, so they are carnivores or omnivores..
4. The highest level is tertiary consumers that eat secondary consumers
According to this, and knowing than y
ellowfin tuna eat smaller herbivorous fish, it can be concluded that it belongs to the secondary consumers.