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Why is seagrass incapable to grow in a freshwater environment?

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The tallest seagrass species—Zostera caulescens—was found growing to 35 feet (7 meters) in Japan. Some seagrass species are quick growing while others grow much more slowly. read more

Because they depend on light for photosynthesis, they are most commonly found in shallow depths where light levels are high. Many seagrass species live in depths of 3 to 9 feet (1 to 3 meters), but the deepest growing seagrass (Halophila decipiens) has been found at depths of 190 feet (58 meters). read more

Seagrass/algae beds are rated the 3rd most valuable ecosystem globally (on a per hectare basis), only preceded by estuaries and wetlands. The average global value of seagrasses for their nutrient cycling services and the raw product they provide has been estimated at 1994US$ 19,004 ha-1 yr-1 (Costanza et al. 1997). read more

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