Hydra culture:

Hydra is available from Southern Biological Services Pty Ltd, Victoria.
Place Hydra in an 11cm petri dish or other glass or hard plastic container.
Add about 2.5cm of Evian spring water. This seems to give the best results. It has been found that Hydra do not thrive in other types of spring water.
Change the spring water once a week, and feed with brine shrimp (and/or Daphnia) every 1 or 2 days.
To culture brine shrimp:
Follow the directions that come with your brine shrimp (aka sea monkeys) eggs, or:
1% salt (NaCl) solution.
500ml beaker.
Air pump with tubing, no air-stone.
Piece of white cloth for straining and rinsing.
Spring water.
Add about ¼ teaspoon eggs to about 400ml 1% solution.
Aerate.
Shrimps will hatch in about 24 hours.
To feed the Hydra:
Pour brine shrimp into a flat container, and shine a light at one edge. The shrimp will swim towards the light in 15 to 30 minutes. You can also just shine the light at the top of the beaker, after turning off the air stone.
Place the piece of cloth over a beaker. Collect the shrimp with a pipette, and squirt it onto the cloth.
Rinse the shrimp with distilled water. Using a clean pipette, draw up the shrimp. Move the brine shrimp water in and out of the pipette.
Squirt rinsed brine shrimp over the Hydra, attempting to hit most of the tentacles.
Hydra can also be fed on thawed frozen brine shrimp. They will feed if the food is pushed onto the tentacles with a pipette.

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