Add butter/olive oil combination. Add the fillets, without crowding. Increase heat to high and saute, shaking the pan from time to time, until the bottom of the fish is nicely browned, about 3 minutes. Turn and brown the other side. Remove fish to a plate and keep warm in the oven. Repeat with remaining fillets.
Copepods are considered to be primary consumers. They form an important link in the food chain. Their diet consists of small plant plankton.
Examples of secondary consumers are bears, snakes and foxes. Tertiary consumers are the carnivores at the top of the food chain in a given ecosystem. They eat only meat, and their diet usually includes secondary consumers. Examples of tertiary consumers are hawks and mountain lions.