you can lvl alchemy from 0-50 purly by breaking fish into shards or crystals, also doing this u can lvl cooking to about 35+/- and gold to 10-15 if you make your own sea/river sand to break the crystals into shards, again lvling fishing you can also turn in for GC seals as Aratharn says, check out this site for w/e company your with's item of the week...
https://docs.google.com/spreadsheet/...hl=en_US#gid=0

lvling alchemy and fishing you will never run out of gil as it costs nothing... its very time consuming to do both thou so be warned ;p. as others have said alchemy is a lil messed up but it is still very possible to hit 50 with only fish. hopefully it will ge some nice recipes soon especially for 35-50. look on mooglebox or yg for the lvls of breaking fish into shards/crystals.