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All images: Unsplash

Goal 14: Life Below Water

10 need-to-know facts about… Life Below Water

Here's why healthy oceans and seas are essential to our existence.

By jessica jurkschat
27 october 2020

Our blue planet is defined by its oceans. Sadly, the saying ‘plenty more fish in the sea’ could soon become obsolete.

Let's start with some statistics

  • Oceans cover 70% of the planet Earth and make up 97% of Earth’s water.
  • Over 3 billion people depend on marine ecosystems to make their living. It’s estimated that the goods and services the ocean provides are worth at least US$2.5 trillion per year, making it the world’s seventh-largest economy. 
  • It’s estimated that we only know 230,000 of the two million living species in the ocean. 
  • More than 80% of the ocean remains unexplored. Since it’s difficult to protect what we don’t know, only about 7% of the world’s oceans are designated as marine protected areas.

Oceans are giant sponges

They absorb about 30% of the carbon dioxide that humans produce, helping to reduce the impact of climate change. Unfortunately, the increase in CO2 has caused ocean acidity to rise by approximately 30% since pre-industrial times. And this acidification is causing big problems for marine species like coral. In fact, about 50% of the world’s shallow water coral reefs have already been destroyed – with no prospects for recovery.

The plastic problem

One of the advantages of plastic is that it is designed to last. Which is a blessing and a curse. Nearly all the plastic ever created still exists in some form today. Not only does it end up in our oceans, but it can also take hundreds of years to break down - if at all. Current estimates report that there are over 150 million tonnes of plastics in the ocean today and an estimated eight million metric tons of plastic waste entering our oceans every year. This equates to one garbage truck’s worth of plastic being dumped into our oceans every minute, the total weighing an equivalent of 90 aircraft carriers. On top of that, models project that by 2050, there will be more plastic by weight than fish in the oceans. 

ocean-plastic-pollution

The plastic solution?

It’s early days yet, but work is underway to clean up the five massive rubbish patches in our oceans. One pioneering venture in this field was founded in 2013 by an 18-year-old Dutch inventor called Boyan Slat. His company, the Ocean Cleanup, is developing a passive ocean cleanup technology, that just like the plastic, moves with the currents to catch it. By deploying a fleet of systems, The Ocean Cleanup has estimated to be able to remove 50% of the Great Pacific Garbage Patch every five years.

Welcome to the dead zones

Agricultural runoff and sewage flowing into the ocean create areas of low oxygen, dubbed “dead zones”. In these areas, marine life is unable to survive, and ecosystems collapse. To date, scientists have identified 415 dead zones worldwide, with a total surface area of over 245,000km². That’s about the same size as the United Kingdom. 

fish-underwater-ocean

Plenty more fish in the sea?

Sadly, according to the International Union for Conservation of Nature (IUCN), less and less so. Roughly 1,414 species of fish, or 5% of known species, are endangered. In May 2020, for the first time in modern day history, the IUCN formally declared a marine fish species as extinct. Despite extensive searches over the years, the smooth handfish (sympterichthys unipennis), a shallow-water bottom-dweller with spiky fins and a barb-like protrusion on its forehead, has not been seen since 1802, when French biologist François Péron scooped one up near the coast of Tasmania.

One fish, two fish

In 2015, in the small Madagascar village of Andavadoaka, locals who rely on fishing for their livelihoods were asked to close some of their favourite fishing zones for two months, allowing time for the species to breed and for populations to grow again. After the hiatus, they returned to fishing, and were surprised to find their catches had doubled in size. More importantly, their earnings tripled. Twenty other villages have now followed their lead.

Canaries of the sea

Beluga whales, weighing in at up to 1.5 tons each, are extremely sociable mammals. They do everything with their pods, which can range in size from just a few in number to several hundred. Their signature bulbous foreheads (called “melons”) are flexible, allowing beluga whales to pull faces. These talented creatures can also whistle and chirp, a fact that has earned them the nickname “canaries of the sea”. Unfortunately, shipping and other human marine activity cause underwater noise pollution that interferes with their communication, making it harder for them to find food, find mates, and look after their young.

Space Invaders

With ever-expanding global trade, protecting ecosystems from invasive species is harder than ever. Scientists estimate there are 5,000 to 10,000 species traveling in cargo ships at any given time, floating in the ballast water used to keep the ships stable at sea. When the water is released on arrival, so are those living creatures. Zebra mussels are said to have attached themselves to the sides of ships travelling from Central Asia, then set up home in the Great Lakes of North America. There, they now clog boat engines, damage water pipes – and, most significantly, threaten native species.

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