Provided alwaies and it is hereby declared That this Act shall in no sort impower any Person or Persons to remove or alter any of the said Floodgates nor to hinder or deprive the said Earl his Heires or Assignes from the sole and severall Right of fishing in the said River within the Liberty of Donnington Kings Mills in the Parish of Castle Donnington and County of Leicester and the Mannors of Melborne and Kings Newton in the County of Derby but that the said Earl may have the sole Fishing of the Waters there in such manner as he now holds and enjoys the same and that the said Weare shall and may be continued in the said River as it now is saving such Alteration as may be made therein by any Lock or Locks pursuant to this Act