This is a 4K video of a dark-field observation with a red background. Hydra captures the Daphnia and swallows it. I will swallow a daphnia paralyzed by puncturing a tentacle with a poisonous needle. There are daphnia that do not paralyze even if they touch their tentacles, so it seems that poisonous needles do not stick anywhere on the body. The water flea shell may have helped in defense.
Microscop: Olympus CH2
Objective lens: Olympus SPlan 4
Relay lens: Olympus NFK 2.5x
0.7x mount adapter
Camera: Sony α6300
Microscope camera adapter: MCA-O-OR
Recorder: ATOMOS Shogun Inferno
赤色の背景がヒドラのイメージに合っていると思います。
背景に色を付けた暗視野観察についてはこちらの記事をご覧ください。
I think the red background matches the image of Hydra.
Please see this article about dark field observation with colored background.
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