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The Man o’ War is a species of siphonophore, a group of animals that are closely related to jellyfish. The Portuguese man o’ war is recognized by its balloon-like float, which may be blue, violet, or pink and rises up to six inches above the water line.
While box jellyfish are found in warm coastal waters around the world, the lethal varieties are found primarily in the Indo-Pacific region and northern Australia. This includes the Australian box jellyfish (Chironex fleckeri), considered the most venomous marine animal.
The National Ocean Service (NOS) translates science, tools, and services into action, to address threats to coastal areas such as climate change, population growth, port congestion, and contaminants in the environment, all working towards healthy coasts and healthy economies.
What is a Portuguese Man o’ War? Are all fish cold-blooded? What is a platypus? What are brain corals? What is ocean etiquette?
What is a Portuguese Man o’ War? How do people use kelp? How does pressure change with ocean depth? What is the custom dashboard feature of NOAA’s Coastal Inundation Dashboard? What is a red tide? Can a coral reef recover from bleaching and other stressful events? What is remote sensing? What is resilience? What is a rip current?
The Sargasso Sea is a spawning site for threatened and endangered eels, as well as white marlin, porbeagle shark, and dolphinfish. Humpback whales annually migrate through the Sargasso Sea. Commercial fish, such as tuna, and birds also migrate through the Sargasso Sea and depend on it for food.
A tide pool is an isolated pocket of seawater found in the ocean’s intertidal zone. Tide pools are found in intertidal zones, which are areas where the ocean meets the land: from steep, rocky ledges to long, sloping sandy beaches and vast mudflats.
The National Ocean Service (NOS) translates science, tools, and services into action, to address threats to coastal areas such as climate change, population growth, port congestion, and contaminants in the environment, all working towards healthy coasts and healthy economies.
Many grow optimally in water temperatures between 73° and 84° Fahrenheit (23°–29°Celsius), but some can tolerate temperatures as high as 104° Fahrenheit (40° Celsius) for short periods. Most reef-building corals also require very saline (salty) water ranging from 32 to 42 parts per thousand.
Home Ocean Facts How does pollution threaten coral reefs? How does land-based pollution threaten coral reefs? Many serious coral reef ecosystem stressors originate from land-based sources , most notably toxicants , sediments , and nutrients .