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Alexander Semenov @Alex_Aquatilis

Marine biologist | National Geographic Explorer | Head of Aquatilis Expedition | Head of the Scientific Diving Department at the White Sea Biological Station coldwater.science World Ocean and surroundings Joined December 2021
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Alexander Semenov @Alex_Aquatilis

5 days ago

SpaceX new booster! Alitta virens polychaete discharging sperm at full speed while the eggs (little dots in the picture) are already floating all around in the vast space of the White sea.

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Alexander Semenov @Alex_Aquatilis

a week ago

Alitta virens polychaetes flying around. This is their breeding behaviour: for a couple of days a year they float en masse from the bottom to the surface to spawn and release their sexual products into the water. The fertilisation is external, so this is how system works.

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Alexander Semenov @Alex_Aquatilis

2 weeks ago

Lucernaria sainthilarei, lovely little stalked jellyfish. They live on muddy parts of the seafloor, clinging to boulders and small rocks. Usually these are places with gentle currents and depths greater than 15-20 meters.

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Alexander Semenov @Alex_Aquatilis

3 weeks ago

Coryphella nobilis is one of my favorite nudibranchs. Every time I get excited when I meet these guys with thick, vibrant papillas!

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Alexander Semenov @Alex_Aquatilis

a month ago

Cyanea capillata (aka Lion's mane), one of the most beautiful jellyfish in the Arctic. The lion's mane of tentacles have gone a little bald, but the jellyfish still looks amazing.

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Alexander Semenov @Alex_Aquatilis

a month ago

Finally got my hands on the photos again! What a joy to clean and handle them.

Alexander Semenov retweeted
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BlueNightsTorreira @BlueTorreira

7 months ago

At the Museum, the exhibition "Mysterious Creatures from the Ocean" could be admired by visitors, with the amazing images from Jeffery Stone & Alexander Semenov! #EuropeanResearchersNight #bluenightstorreira #OceanDecade @UnivAveiro @DiatomsATTACK @Alex_Aquatilis

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Alexander Semenov @Alex_Aquatilis

7 months ago

A huge mouth of Beroe cucumis would also fit in nicely in #CtenophoreDay

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Alexander Semenov @Alex_Aquatilis

7 months ago

Ctenophore day? Ok! Mertensia ovum floats in the green waters of the White Sea. #ctenophoreday

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Alexander Semenov @Alex_Aquatilis

10 months ago

Cute!

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FUMIHIKO HIRAI🐝昆虫スローの人 @uta_31

10 months ago

Cute!

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Alexander Semenov @Alex_Aquatilis

10 months ago

International Polychaete Day? Yes!

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Alexander Semenov @Alex_Aquatilis

10 months ago

Flying worms | Sea dragons. Huge, up to 40 centimetres long, Alitta virens polychaete worms rise to the surface by the hundreds of thousands to release their eggs and sperm into the water. So yesterday, we were swimming in it all, laughing awkwardly and filming the whole process.

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Alexander Semenov @Alex_Aquatilis

10 months ago

The surface of the starfish Crossaster papposus is something out of this world. I rarely observe this colouration, but if I do, I always take a few photos.

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Alexander Semenov @Alex_Aquatilis

11 months ago

I miss the warm seas a bit. I've been diving in -2°C water for over a month now, and it's only now the sea is getting warmer, it's already +6. But it's +27°C somewhere and there are fantastic coloured corals all around.

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Alexander Semenov @Alex_Aquatilis

11 months ago

In the last couple of weeks, I've been vigorously editing dozens of grant photos that can't be shown yet (until autumn, argh). Suffering because I want to show everything immediately! Well, this season's new images are also coming out awesome.

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Alexander Semenov @Alex_Aquatilis

12 months ago

Clione limacina kid. The thing is just 5 mm in size. It still has the larval ciliary bands, which will fall off later. The transparent balls under the skin are fat droplets that accumulate as they digest sea butterflies.

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Alexander Semenov @Alex_Aquatilis

12 months ago

Lion’s mane jellyfish (Cyanea capillata) without its mane. After reproduction, they shrink in size, lose thousands of tentacles and become fantastic alien flowers.

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Alexander Semenov @Alex_Aquatilis

12 months ago

These are young, newly hatched skeleton shrimps from the Sea of Japan hanging out on the Blue bat star, Patiria pectinifera. The Far East's underwater life densities per square metre are astounding sometimes.

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