Sorry to jump in a little late on this one....
The Trent has an excellent reputation for fishing, but predominantly coarse fishing. As others have rightly said, the river can be pretty polluted in places, which isn't surprising since the river itself runs through Stoke and the Potteries, is then joined by tributaries from the Black Country before flowing past Derby and through Nottingham before heading north to the estuary. In the recent past, it's been subject to discharge from coal and gas power stations which was generally noted as being very warm and well oxygenated which lead to all manner of micro-nasties breeding. Much like tenderfoot, my first time at Holme Pierrepoint lead to an insane case of multi-orifice extrusions the following day.:yikes:
With regards to the fishing, you can see the full list of the Midlands regions byelaws here:
http://www.environment-agency.gov.uk/static/documents/Leisure/midlands_byelaws_795945.pdf
In summary, the only fish you can catch and take (subject to the rules and regs of the fishery owner) Eels from rivers in the coarse fishing closed season if you use a hook with a 1/2" gape as well as the following baits included in the byelaws thus;
ii) in fishing with rod and line for trout or any fish other than
freshwater fish during the annual close season for freshwater
fish, use any float or bait (which term includes ground bait)
other than artificial or natural fly (which term excludes
bloodworms, jokers and other midge larvae), spinners,
minnows, worms, prawns or shrimps.
(taken from the above weblink to EA Midlands region byelaws)
I've eaten all manner of fish in the past three decades, some of which have been culinary disasters (Perch), and some have been triumphs (Zander), but all species require research, understanding, preparation and of course respect for their breeding patterns and habitat before fishing and potential consumption.
I hope that this info clarifies the subject a little. I'm sure that most of you fellas will agree that the rules are mainly in place to protect the fish and to educate the newcomers to the pastime.