PURPOSE: To obtain the feed, containing a hop (extracted ingredient) as an active ingredient and capable of improving the hypoxia resistance by administration thereof to fishes and transporting the fishes in a live state without utilizing a special apparatus such as an oxygen blower without deteriorating the vitality thereof.

CONSTITUTION: This feed is obtained by preferably heat-treating a hop or an ingredient extracted from the hop and including the resultant ingredient as an active ingredient. The feed is supplied to fishes for a prescribed period and the fishes in a live state are then transported. The hop and the extracted ingredient thereof are preferably contained in an amount of 0.1-10.0mg based on 100g feed.