Dear Group,

Please accept my apology for a poorly worded post.  I certainly didn't
mean that my only aim was to physically blind fish.  I would of course
prefer a non-invasive method (i.e., some sort of cup, or adhesive).  I
was looking for suggestions from people who have perhaps had reason to
do this.  My worry was that tapes could cause damage to the corneal
surface.

Turning off the lights could change feeding behaviour but I guess
whatever measure is taken will alter normal behaviour.

Again thanks for the replys.

Ian Quittner