Neritic zone

The ocean has shallow parts near the land.

Sunlight reaches the bottom in these areas. This light helps tiny plants grow. Many small fish and shrimp eat these plants.

Corals also live in these waters. Most sea life stays in this zone. It is a busy place for animals. It is a very good home for many creatures.

The ocean has many different parts. One part is called the neritic zone. This is the shallow area near the coast. It goes from the shore to the edge of the continental shelf. This shelf is the edge of the land under the sea. The water here is about 200 meters deep.

Sunlight can reach the bottom in this zone. We call this the photic zone. This light is very important. It helps tiny plants grow. These plants make food for other life. This includes small fish and shrimp.

Many animals live here. Corals also like this zone. They stay in the water and do not move. This area has plenty of oxygen. The water temperature stays mostly the same. It also has low water pressure. Because of this, most sea life lives here. It helps support the world's big fisheries.

[CAPTION: Sargassum seaweed grows in the water.] [CAPTION: A map shows where the shallow zone is.]

The neritic zone is a very busy part of the ocean. Some people call it the coastal ocean. It is the shallow part of the sea near the land. This zone sits right above the edge of the continental shelf. This shelf is a big underwater ledge. The neritic zone matters because it holds most sea life. It is a place where the ocean meets the coast.

Sunlight is the main way this zone works. Sunlight can reach all the way to the ocean floor here. This area of light is called the photic zone. The light usually reaches down about 100 meters. This light allows tiny plants to grow through photosynthesis. These plants use light to make food. This process starts the whole food web.

Scientists use different names to study this area. Marine biologists look at the living things there. They see zones like the infralittoral zone. This part is filled with algae. They also study the circalittoral zone. This area has animals like oysters that stay in one place. These animals are called sessile. The subtidal zone is also part of this area. It stays under the water all the time.

Many facts help us understand this zone. It reaches depths of about 200 meters. That is about 660 feet deep. The water has plenty of oxygen. The temperature stays mostly the same. The salt levels are also very stable. There is also low water pressure here. These things make it a great home for life.

This zone connects to many things we know. It supports the world's great wild fisheries. This means it provides food for many fish. Tiny things like phytoplankton and sargassum seaweed grow here. Small creatures like shrimp and fish eat them. Even corals live in this zone. They like it more than the intertidal zone. This is because the water is more stable there.

The neritic zone is a vital part of the global ocean system. It is the relatively shallow area located above the continental shelf. Some scientists also call this the sublittoral zone or the coastal ocean. This region is important because it serves as a meeting point. It is where the oceanic system interacts directly with the land and coast.

Because it is shallow, it provides a stable environment for a huge variety of life.

The most important feature of this zone is sunlight. Sunlight can reach all the way down to the ocean floor here. This area of light is known as the photic zone. In most cases, light can penetrate through the water about 100 meters deep. This depth is about 328 feet. When light reaches the benthic zone, which is the ocean floor, it allows life to thrive. This light is the engine that drives the entire ecosystem through photosynthesis.

Marine biologists divide the neritic zone into several specific layers. First, there is the infralittoral zone. This area is dominated by algae and extends to about five meters below the low water mark. Next is the circalittoral zone. This region is further out and is home to sessile animals. Sessile animals, such as oysters, are organisms that stay in one place. Finally, there is the subtidal zone. This part of the neritic zone is always underwater and is never exposed to the air.

Physical oceanographers study the zone for its movement and energy. They look at how the water behaves near the coast. This includes significant tidal flows and the way energy dissipates. They also observe internal waves and ocean fronts. River outflows also enter this zone, bringing new materials into the coastal waters. These physical forces help shape the environment that marine life inhabits.

The physical conditions in the neritic zone are ideal for life. The water is generally well-oxygenated and receives plenty of sunlight. Temperatures remain relatively stable in this region. Additionally, the water pressure is low compared to the deep ocean. The salinity, or the amount of salt in the water, also stays stable. These factors create a perfect setting for high primary production. Primary production is the process where organisms create energy from sunlight.

This high energy production supports a massive food web. It begins with photosynthetic life like phytoplankton and floating sargassum seaweed.

Tiny creatures called zooplankton then feed on the phytoplankton. These zooplankton include microscopic foraminiferans as well as small fish and shrimp. These two levels form the base of the food chain. This process ultimately supports most of the world's great wild fisheries. Corals also thrive here because the environment is more stable than the intertidal zone. The neritic zone can reach depths of about 200 meters, or 660 feet.

The size and shape of the neritic zone can change depending on the geography. Some coastal areas have very long stretches of shallow water. These areas extend far out from the landmass into the sea. However, other places have very short neritic zones. For example, islands formed from ancient volcanoes often have very steep edges. In these cases, the continental shelf drops away quickly. This means the shallow, sunlit area is much smaller than in other parts of the world.