Attached Link: http://www.sams3d.com/Tutorial.htm

Virus, about the setting for the hip it's not something special (btw: i'm not a specialist for PHI-file or setting joints) I just thinked the most direction i would turn a fish is up and down swimming while the left and right turn i would do the most times with camera movement. There's a really good tutorial about creating CR2-files from SAMS3D, because it describes a point and gives at end of each description a explanation why. I used this for the last car i'm done and hided the unneeded turn-dials and renamed the needed. May you allready know all this technical-stuff. For me it was completelly new. Anyway i have attached the link to it. Hey thanks Anthony, now as you described the curve-thing i will definitely test if this will work, because this will give most of the animals much more naturality.