Marine Science Australia
Krill
About Krill
Krill are small crustaceans of the order Euphausiacea, they are found in all the world's oceans. The name krill comes from the Norwegian word krill, meaning "young fry of fish", which is also often attributed to other species of fish.
Krill Behaviour
The life cycle of krill is relatively well understood, despite minor variations in detail from species to species. After krill hatch, they experience several larval stages, each of which divides into sub-stages.
The pseudometanauplius stage is exclusive to species that lay their eggs within an ovigerous sac: so-called "sac-spawners". The larvae grow and moult repeatedly as they develop, replacing their rigid exoskeleton when it becomes too small. Smaller animals moult more frequently than larger ones.
Yolk reserves within their body nourish the larvae through metanauplius stage. By the calyptopsis stages differentiation has progressed far enough for them to develop a mouth and a digestive tract, and they begin to eat phytoplankton. By that time their yolk reserves are exhausted and the larvae must have reached the photic zone, the upper layers of the ocean where algae flourish.
During the furcilia stages, segments with pairs of swimmerets are added, beginning at the front most segments. Each new pair becomes functional only at the next moult. The number of segments added during any one of the furcilia stages may vary even within one species depending on environmental conditions. After the final furcilia stage, an immature juvenile emerges in a shape similar to an adult, and subsequently develops gonads and matures sexually
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Marine Science facts
The vampire squid gets its name not because it has a taste for blood but from the dark skin on its arms that makes it look like it’s wearing a Dracula-esque cape?
The oceans provide 99% of the living space on the planet containing 50-80% of all life.
The Oceans cover 70% of the earths suface
The deepest part of the ocean is called the Mariana Trench, which is around 7 miles deep and is located in the South Pacific Ocean.
The water pressure at the bottom of the Mariana Trench is eight tons per square inch. This means the pressure there is enough to crush you.
The largest mountain range is found underwater and is called the Mid-Oceanic Ridge that is around 65,000 kilometres long.
Sponges are older than dinosaurs.
Half the Oxygen we breath is produced in the Ocean.
Irukandji jelly fish, with just a brush of venom leaves almost no mark. But after about a half hour you develop Irukandji syndrome, a debilitating mix of nausea, vomiting, severe pain, difficulty breathing, drenching sweating and sense of impending doom. You get so sick that your biggest worry is that you’re not going to die.
The most remote point in the oceans is called Point Nemo.
The Pacific, Atlantic, and Indian oceans are known as the three major oceans.