Help - Plant Eating Larvae

[dbtars]

Hi,

This morning i found a larvae eating my plants. Can you help my identify it ? my water plant shop reseller haven't seen this in the past.

Its about 1 inch long, and transparent.(not green like in picture)

when i removed it from water, it shrank and lost its internal water.

I dont have any fish in the tank yet. I started it only 10 days ago.

I assume it was a hitchhiker on one of the plants and therefore i can expect more.

If so, i want to know if its dangerous to fish as well as eating my plants....

i was planing to add fish in two weeks but would like to do a water treatment in advance if necessary.



thanks
David

 

[MBOU]

Could it be these? (bear in mind colours vary..)
http/bugguide.net/node/view/299803
 
Not sure if Hydrochara is a species you would have in Israel as the website is American but of all the bugs on that page, only two had similar 'fluffy bits' and both were species of Hydrochara beetle larvae.
http/bugguide.net/index.php?q=search&keys=aquatic&search=Search
 
EDIT: Seems there are plenty of species of Hydrochara that could be in Israel so it is feasible.