Hydra In fry Tank...

[Scholz]

So I was posting a picture of my 1 week free swimming betta fry.... and then i looked closer at the picture!

HYDRA!!!

The green ones!

Hydra (Chlorohydra) viridissima (green hydra) is a bright green species, owing to the presence of numerous algae called zoochlorellae, which live as symbionts within the endodermal cells.The zoochlorellae carry out photosynthesis and produce sugars that are used by the hydra. In return, the carnivorous diet of the hydra provides a source of nitrogen for the algae. Green hydra are small, seldom more than 0.4 inches (10 mm) long, with tentacles about half the length of the column.

taken from http://www3.northern.edu/natsource/INVERT1/Hydra1.htm

Kinda cool.... but I fear I may have lost some fry to them when they were smaller.... I think the fry are too big to be caught now...

I hear Fluke Tabs can be used to get ride of them With no harm to young fry. Like rainbow fish fry.... Don't want to chance it though.

I'm not going to do anything about them...

any idea's though?

[gimlid]

panacur from the vet took care of the hydra in my tank (there were alot too)
the stingers will likely cause alot of irritation if not damage to the smaller fish.
I got single packets for like 50cents I think at Kingsway Vets in Vancouver.
worked like a charm

[Scholz]

I just don't think they are going to harm the fry.... I might treat the tank after the fry are grown... then again I might not... We'll see how the fry do...

[darb]

I am willing to bet that there won't be any hydra left in a couple of weeks, unless the fry are herbivores ...

[Scholz]

I've read that some fry eat them.... But i don't think the betta fry will.... We'll see!

[kelly528]

I would keep an eye on that. I once lost a batch of 26 endler fry to a hydra infestation. Before I even knew what was hapening. The don't necessarily eat them but all they have to do is sting them to kill them.

[Morainy]

What?!! What are hydra? Where do they come from? Why do they sting fry? Yikes!

I would keep an eye on that. I once lost a batch of 26 endler fry to a hydra infestation. Before I even knew what was hapening. The don't necessarily eat them but all they have to do is sting them to kill them.

[Scholz]

I would keep an eye on that. I once lost a batch of 26 endler fry to a hydra infestation. Before I even knew what was hapening. The don't necessarily eat them but all they have to do is sting them to kill them.

white hydra or green?

the white are alot larger and i could see the sting of the white ones being trouble, i wouldn't have even know i had hydra if it wasn't for the macro picture

[CRS Fan]

Many hydra have the ability to hold chlorophyl in their bodies. I had several different colours simiultaneously once (clear, tan, and green). I have some liquid panacur you can borrow for your tank. It is fry and shrimplet safe.

PM me if interested, Brian.

Stuart

[Scholz]

Many hydra have the ability to hold chlorophyl in their bodies. I had several different colours simiultaneously once (clear, tan, and green). I have some liquid panacur you can borrow for your tank. It is fry and shrimplet safe.

PM me if interested, Brian.

Stuart

Some Hydra take on the colour of the food they eat... From what i've read there are only two main types of hydra.... The white ones which take on the color of the food they eat. They are also much larger. And the grean which have a sybiotic relationship with the algae in their systems and are photo sensative....