Jumping Shrimp

It is not unknown for shrimps to climb up cables, pipework etc. It is often because the water isn't in good enough condition for them eg people trying to do a fish-in cycle with shrimps in the tank. But as your tank won't have iffy water, I suppose they could have found your tank water sufficiently different from the shop tank that they tried to leave it. Did you acclimatise them or put them straight in? I know Richard W says we don't need to acclimatise fish as it takes days not the minutes or hours we do it for but I don't know if the same applies to shrimp.

Yamato is another name for amano shrimp (Caridina multidenta, used to be Caridina japonica), and I've had these with no problems. The last one died when I had to add a med to the tank and I'd had him for five and a half years.
Apart from the odd one that died soon after I got them, I found amanos easy to keep. There are a couple of shrimp sites with info here and here

I've had snails climb out of the tank and a female betta that jumped every time I opened the lid (eventually found her dried up behind the tank) but never shrimps for some reason.

Sorry for your loss Fruitbat.

I didn't know they jumped either until I came to putting my new red cherry ones in the tank.

In my wisdom I decided not to just put them in after acclimatising them but to pour them into a strainer over a bucket so that none of the original water went in with them.
They jumped around like fleas !! Managed to get all but one in and he jumped out of the strainer before I could position it over the tank. Good fortune was with me though as he jumped straight into the water.

I started with 12 about 2-3 weeks ago, bought from a lady on Gumtree. I periodically see 5/6/7 of them but have never to this day seen all 12.

I do find their ecoskeletons though and so far have had 3 large and one smaller so I am assuming they find the water acceptable.

I'm hoping to collect a couple of Amanos from the Maidenhead near my daughter on Saturday for my 60cm tank so fingers crossed they have some.

My Aquaone tank has a 1/2 gap all round the glass and I made a new net top for the tank that fits all round.  It isn't particularly tight so I suppose they could in theory climb past it. Gives me a bit of confidence though.

I have seen them a couple of times resting on the top of the pipe from the outflow and one was on the top of an Alder cone I put in last night.  That is right to the top of the water and near the edge of the tank so I'd better think about moving temlptation out of their way.

my tank is pretty secure so will have to watch them when feeding and cleaning ..  going to get 2 more on sat and hopefully they won't jump to their deaths! sanjo , i only had them a night but they never hid just got on with finding food so hopefully they will not be quite as secretive as your shrimps...  thanks sue, may give them betas a miss for now .. ;-)