Re: Fyke nets
You must use otter guards on any fyke nets whether for eels of whatever. Otter guards are a legal requirement under Fisheries byelaws. Guards are apparently regularly sent to eel netsmen with new net licences. Illegal fyke nets and legal ones will kill otters unless set properly. Read this article by the NFU from March 2004:
Illegal eel net risk to otters
the problem is a fyke nets works by utilising a series of hole apertures which get increasingly small and trap the eel. But the otter can get in and get stuck whereas a fixed sixe aperture of a crayfish trap would prevent this. Personally I could not see a reason to use a fyke net when crayfish traps will work fine. I can post details if you want.
"He who would travel happily must travel light." - Antoine de Saint-Exupery. French aviator & author 1900 - 1944