It depends where in the ocean. If its in the deep bottom where almost or no light reaches than the basis would be unicellular bacteria. if its at top it would be algae including seaweed and etc.
Algae form the main basis of the aquatic food chain.
Algae feed small fish which starts the food chain.
sharks,fish,algae
It forms almost every ecosystem because they are the producers and pastures of them. Small organisms eat and big follow.
Algae play a crucial role in ocean food chains as they are primary producers that convert sunlight into energy through photosynthesis. They serve as a food source for various marine organisms, including zooplankton, which are then consumed by larger animals such as fish and whales. Without algae, many marine ecosystems would collapse due to lack of energy at the base of the food chain.
Seaweed, seagrass, kelp, green algae, red algae and brown algae are six commonly-known ocean plants. Plants, or producers, are vital to the health of ocean ecosystems and serve as a food source to higher organisms.
Producers are: organisms that produce there own food, such as plants. I do do not believe that animals can be producers-it's impossible. An example are like plankton, algae, and other plants that are i the ocean.
I only know some of the ocean resources. Some of them is oil, minerals, algae, food, and renewable energy and/or resources
One-celled organisms called diatoms are the beginning of most ocean food chains.
There are two- algae and phytoplankton. These are small plants and animals in the ocean.
Phytoplankton to dragonfish to anglerfish to shark
Sea urchins eat endlessly as long as there is food they are eating. They eat the algae growing in slat water tanks and the ocean.