Chromis viridis (green chromis) is a species of damselfish.

Fish trust friends in a crisis

In social animals living in the wild, individuals rely on their buddies to alert them if a predator is lurking.



All animals aim to balance the risk of predation against the energy investment necessary to execute an escape, to maximise the number of correct reactions (e.g. reacting to the presence of a predator) and minimise reactions to inaccurate information (e.g. reacting to harmless stimuli).

Trust among individuals is critical. This is true for humans as well as many other species, including fishes.

Study co-author Jacob Johansen, Ph.D.

A diver examines the remains of an ancient military vessel discovered in the Mediterranean sunken city of Thonis-Heracleion off the coast of Alexandria, Egypt, in this handout image released on July 19, 2021.
A diver examines the remains of an ancient military vessel discovered in the Mediterranean sunken city of Thonis-Heracleion off the coast of Alexandria, Egypt, in this handout image released on July 19, 2021.

Egypt finds ancient military vessel

Prior to the founding of Alexandria by Alexander the Great in the year 331 BC, Thônis-Heracleion was the largest port city in Egypt, controlling the entrance to the country at the mouth of a western branch of the Nile River and dominating the area for centuries.

Destroyed and sunk along with a wide area of the Nile delta by several earthquakes and tidal waves, Thônis-Heracleion was rediscovered in 2001 in Abu Qir Bay near Alexandria, now Egypt's second-largest city.

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World Shoutout 2021 Registration Open

This year, like last year rules are different, it is time to check your archives for what you have achieved, as "pictures of your life" competition is for the best photos you have taken in past years. 

Deadline for registration and submitting images November 1st, 2021
At the end of the competition, a digital album will be produced to be sent to all participants

Dive Green with Explorer Ventures Liveaboard Fleet

Starting back in 1987, Explorer Ventures put environmental consciousness at the heart of their business model before “sustainability” was an operational buzzword. This strong foundation has helped them navigate the changing tides of the pandemicand follow their customized sustainability management policy called Dive Green.