In addition to skin patches, other symptoms are pale gills, lethargy, loss of appetite, and difficulty swimming. Be aware ...

1) Fish kept in ice for over two days are not good. Check the gills; they should be red in fresh fish and pale in spoiled ...

Analysis of 33 fish species demonstrates that gill surface area is a primary determinant of oxygen uptake and growth in fish, consistent with the Gill Oxygen Limitation Theory.

After being swallowed alive, Japanese eels were able to escape from a predator fish’s stomach and swim to freedom through the fish’s gills, new research shows.