Final answer:
The Antarctic toothfish would have significantly less than 100% of the energy that algae have, typically only 10% of the energy is transferred between each trophic level in an ecological energy pyramid.
Step-by-step explanation:
If algae are considered to have 100% energy at the base of the food chain, the Antarctic toothfish, which is higher up the food chain, would have significantly less due to energy loss at each trophic level. Typically, only about 10% of energy is transferred from one trophic level to the next due to metabolic processes and inefficiencies.
For the Antarctic toothfish to ascertain its energy level relative to algae, one must consider how many steps it is removed from the primary producers (algae), as each step or trophic level sees a substantial energy reduction. Without explicit information regarding the toothfish's exact trophic level or diet, we cannot determine the precise energy percentage it would have relative to the algae.
This energy transfer is part of what's known as an ecological energy pyramid, where the amount of energy diminishes as you move up the chain. Considerations such as the biomass of algae and the efficiency of each energy transfer would factor into more detailed calculations.