Name the dominant producers in a deep aquatic system. What other name could you give to a primary consumer?

Explanation

**Step-by-Step Solution:**

1. **Identify the Dominant Producers in a Deep Aquatic System:**
- In deep aquatic ecosystems, the primary producers are mainly phytoplankton. These microscopic organisms, including certain types of algae, are crucial as they perform photosynthesis, converting sunlight into energy and forming the base of the aquatic food web.

2. **Define Primary Consumers:**
- Primary consumers are organisms that feed directly on producers. In the context of an ecosystem, they are the first level of consumers that rely on producers for their energy.

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