Distribution of Bottom Fishes in Relation to Oxygen Contents in the Bottom Water of Omura Bay

In accordance to findings on dissolved oxygen distribution in the bottom layer of Omura Bay, trawl fishing was conducted by using a “kogata-sokobiki” type net, and the following results were obtained. Oxygen distributions affect the distribution of bottom living organisms and an oxygen content lower than 1 ml/l appeared to be an extremely unfavourable environment for such organisms. Bottom living organisms for the most part lost their activity and died massively. Those that could avoid the low oxygen environment aggregated toward better conditioned environ-ment and formed the fishing area.