Abstract
Brain imaging requires mounting of zebrafish larvae in a vertical position, but anesthetized or fixed larvae tend to fall on their sides without external support. Current solution is to manually hold individual larva until liquid agarose solidifies, which is time consuming, labor intensive, and unfriendly to beginners. We developed a method to form larva-shaped slots in agarose gel using a computer numerical controlled manufactured mold. Each slot nearly perfectly fits a larva in its upright position, and larvae can be easily mounted by inserting into the slots. On average, each larva can be mounted in <1 min using this method.
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