• Tagged algae, algal blooms, bioluminescence, ecosystem, environment, harmful algal blooms, phenomena, phenomenon, Red Tide, science

While you might not stop to think on it, water is full of algae and aquatic microorganisms that play a vital role in marine and fresh-water ecosystems. Not all algae is harmful, but when microscopic algae grows too quickly, then it can cause a phenomenon commonly called “red tide.” Scientists prefer the term algal blooms. Not all of these “red tide” algal blooms are red or dangerous, some even appear to glow with bio-luminescence, but harmful algal blooms can poison shellfish, fish or other wildlife. It’s no longer cool to call these “red tides” because red tides are very often not red; many have no discoloration at all. Red tide also is not the same thing as the wide variety of algal bloom species that are often mistakenly called red tides. Yet when the water appears blood red, which is rare, and dead fish are floating on the surface or the beach, then it freaks people out and rumors start flying about the “end of the world.” There are varying opinions about if it is “safe” to swim in a “red tide” which often comes in a rainbow of algal bloom colors . . . and shades of harmful algal bloom. Would you swim or fish in these waters? [38 Photos]

• Tagged bioluminescence, bioluminescent jellyfish, box jellyfish, jellyfish, jellyfish pictures, oceans, underwater, underwater monsters

500 – 700 million years ago, even before dinosaurs roamed the Earth, jellyfish were drifting along on ocean currents. Jellies are among the most spectacular and mysterious marine species in the world. They are the oldest multi-organ animal and have morphed into more than 2,000 different jellyfish species. Some live in freshwater, but jellies can be found in every ocean. Some sea jellies survive close to the surface while others dwell in extreme depths, glowing with bioluminescence in the pitch black water near the bottom of the ocean. Many scientists and deep ocean explorers expect to discover countless more beautiful jiggly jellyfish as they explore deep sea canyons, and other extreme water conditions near underwater volcano vents and in the harsh frozen temperatures of arctic waters. [72 Photos]