They do look to be thin. Look up relative weights for lmb and you'll get a better idea, especially if you get a better way of weighing them. They do not look to be too thin, however. Most pond's lmb tend to be 80 to 90% RW, IIRC. I would leave the lmb if you are trying to develop a BG pond, but if lmb are your goal them I'd say you need to make some room in the pond.


Fish on!,
Noel