From your post, did not see any error with dbcc checkdb. So you do not need to fix any dbcc error.
For the fragmentation, you may run reorg rebuild to the 2 tables.
-- step 1 reorg rebuild with proper syntax
-- according to the menu online for ASE 12.5. reorg rebuild can be used only on data-only-locked tables.
-- sp_help mytab to find out lock schema
reorg rebuild mytab
go
-- step 2 dbcc checktable
select getdate()
go
dbcc checktable (mytab) -- check table not the entire db
go
select getdate()
go
mytab1: 390 pages (for 2k pagesize=780kb)
mytab2: 82265 pages (for 2k pagesize=165430kb)
mytab2 should take longer.
Regards,