Solitary fish hit rock bottom

'Frozen' zebrafish may be first piscene model for human depression...

http://www.nature.com/news/2010/101122/full/news.2010.624.html

Tumours grow their own blood vessels

...suggesting that the blood vessels were of tumour origin....

http://www.nature.com/news/2010/101121/full/news.2010.623.html