please could someone give me good websites which so a fully labled ventilation system of a fish and gills

Since this is not my area of expertise, I searched Google under the key words "ventilation gills" to get these possible sources:

(Broken Link Removed)
http://jeb.biologists.org/cgi/content/abstract/37/1/11
http://links.jstor.org/sici?sici=0014-3820(197606)30%3A2%3C270%3ADADTEC%3E2.0.CO%3B2-S
http://en.wikipedia.org/wiki/Gill
http://links.jstor.org/sici?sici=0045-8511(19670901)3:1967:3%3C581:GVIRR%3E2.0.CO;2-A

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanksfor asking.