Basically they all seem to have slight 'bellys' or bulge on the underside of them. Some bigger fish have bigger bulges and some fish seem to have no bulge. Is this normal? Are they fat? Could it be something wrong with them? I thought they were all male but could they all be pregnant
?
Thanks for any help, pics below
http
/www.flickr.com/photos/trikidy/5621598551/in/photostream
^ The fish looking straight on, see the roundness?
http
/www.flickr.com/photos/trikidy/5621604607/in/photostream
^ Fish on the left, from side, bulge beneath
http
/www.flickr.com/photos/trikidy/5622197534/in/photostream
^Bulge
http
/www.flickr.com/photos/trikidy/5621610445/in/photostream
^ Closer pic of bulge on a fish

Thanks for any help, pics below
http

^ The fish looking straight on, see the roundness?
http

^ Fish on the left, from side, bulge beneath
http

^Bulge
http

^ Closer pic of bulge on a fish