Gouramis

It appears amazing that a fish can suffocate. Yet this is absolutely what happens in some species, for example gouramis, if they are averted from surfacing customarily to take in a swallow of atmosphere.

Gouramis have developed to exist in waters that can end up being particularly level in oxygen. Under such conditions, most fish could sooner or later gag to passing. In gouramis, however, some of the gills have developed into special organs that are very efficient at absorbing oxygen directly from the