Hydra viridissima

Here you can post pictures and videos to show others.
Post Reply
Message
Author
Plasmid
Posts: 566
Joined: Mon Sep 28, 2020 5:34 am
Location: North GA
Contact:

Hydra viridissima

#1 Post by Plasmid » Fri Apr 09, 2021 5:44 pm

About 4 weeks ago I found a small Hydra , being the first one I've ever found it instantly captivated my attention, and I haven't been able to take my eyes and my camera off of it :D
Every so often I move it from one petri dish to another, where there are different sources of food, from small Crustaceans to mosquito larvae. To my surprise while recording it I came across this flat worm, surprisingly the tables were turned and the Hunter became the prey.....Im not too worried since Frank The Hydra ( yes I named it :lol: ) will grow the tentacles back in less than a week.

The flat worm ended up regurgitating one of the tentacles and the Chlorella inside of it. My question is, has anyone seen or read about similar behavior? My understanding is that Hydras contain enough venom to kill small fish, even bigger mosquito larvae succumb to the poison, as seen on the second video.


Last edited by Plasmid on Tue May 04, 2021 6:40 am, edited 4 times in total.

DonSchaeffer
Posts: 3274
Joined: Sun Mar 22, 2020 10:06 am
Location: Winnipeg, Manitoba, Canada

Re: Hydra viridissima gets decimated.

#2 Post by DonSchaeffer » Fri Apr 09, 2021 6:19 pm

Exciting presentation. Enjoyed and learned from it. Thanks.

Plasmid
Posts: 566
Joined: Mon Sep 28, 2020 5:34 am
Location: North GA
Contact:

Re: Hydra viridissima gets decimated.

#3 Post by Plasmid » Fri Apr 09, 2021 6:24 pm

Thank you Don.

User avatar
75RR
Posts: 8207
Joined: Sun Oct 12, 2014 2:34 am
Location: Estepona, Spain

Re: Hydra viridissima gets decimated.

#4 Post by 75RR » Fri Apr 09, 2021 6:41 pm

.
Excellent action video. Do hope Frank recovers soon!
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)


Michael Müller
Posts: 56
Joined: Thu Jun 18, 2020 11:29 am
Location: Germany

Re: Hydra viridissima gets decimated.

#6 Post by Michael Müller » Sun Apr 11, 2021 7:58 am

Great videos!

Some flatworms are known to feed on hydras. They even integrate the cnidoblast of the hydras and use them - probably - as a defense for themselves.
The flatworm may be Stenostomum unicolor, but it is not possible to be sure with a video in darkfield only.

Thanks for sharing.
Leitz Ortholux II

Plasmid
Posts: 566
Joined: Mon Sep 28, 2020 5:34 am
Location: North GA
Contact:

Re: Hydra viridissima gets decimated.

#7 Post by Plasmid » Tue Apr 13, 2021 3:43 am

Michael Müller wrote:
Sun Apr 11, 2021 7:58 am
Great videos!

Some flatworms are known to feed on hydras. They even integrate the cnidoblast of the hydras and use them - probably - as a defense for themselves.
The flatworm may be Stenostomum unicolor, but it is not possible to be sure with a video in darkfield only.

Thanks for sharing.
Thank you for that info... I ended up transplanting the Hydra to another petri dish with clean water, two days later I noticed that it was missing a lot more tentacles, to my surprise I found a fully grown worm, that had been plucking away.... Very difficult to get rid of those guys.

User avatar
Rossf
Posts: 363
Joined: Mon Jan 20, 2020 12:39 am
Location: Victoria Australia

Re: Hydra viridissima gets decimated.

#8 Post by Rossf » Tue Apr 13, 2021 4:41 am

Way cool vid Plasmid-I started to feel a bit ill by the end of it! Was that with a stereo scope? If so what type?-never had one but it’s calling louder each day to be explored-hydras are definitely up there in my “haven't seen yet but really want to” list! Don’t they regrow from tiny bits left?
Keep it up-Frank is in my prayers tonight...

Plasmid
Posts: 566
Joined: Mon Sep 28, 2020 5:34 am
Location: North GA
Contact:

Re: Hydra viridissima gets decimated.

#9 Post by Plasmid » Tue Apr 13, 2021 4:51 am

Yes it was using a stereo similar to this one https://www.amscope.com/8x-50x-track-st ... ights.html which works out perfect for larger samples like Hydras, but any little vibration will cause the water sample to vibrate. For the longest time I disliked the idea of owning a stereo...now I find myself using it a lot more than my compounds. This is the first hydra I've encountered, and haven't been able to find anymore, my understanding is that they can regenerate from small pieces.

Post Reply