Sturgeon: $9.22/lb / 23.48 xp/lb
Perch: $ 0.52/lb / 13.15 xp/lb
Bream: $1.79/lb / 16.48 xp/lb
Silver Bream: $1.24/lb / 14.20 xp/lb
Crucian Carp: $1.60/lb / 14.10 xp/lb
Roach: $1.80/lb / 17.12 xp/lb
Brown Trout: $3.90/lb / 25.15 xp/lb
Bass: $4.20/lb / 24.41 xp/lb
Rainbow Trout: $4.33/lb / 21.7 xp/lb
Pike: $5.89/lb / 20.30 xp/lb
Grayling: $6.30/lb / 21.10 xp/lb
Burbot: $4.60/lb / 22.30 xp/lb
Tench: $3.90/lb / 18.50 xp/lb
Asp: $3.76/lb / 18.95 xp/lb
Common Carp: $2.85/lb / 13.00 xp/lb
Mirror Carp: $4.96/lb / 12.90 xp/lb
Barbel: $2.45/lb / 20.75 xp/lb
Salmon: $11.34/lb / 22.03 xp/lb
Zander: $7.50/lb / 21.66 xp/lb
Catfish: $5.59/lb / 26.17 xp/lb
Chub: $3.70/lb / 15.24 xp/lb
Ide: $2.95/lb / 16.82 xp/lb
Silver Carp: $2.26/lb / 18.70 xp/lb
Grass Carp: $3.12/lb / 16.02 xp/lb
Bleak: $2.08/lb / 22.92/lb
Brook Trout: $4.64/lb / 24.64 xp/lb
Smallmouth Bass: $9.12/lb / 18.67 xp/lb
Bluegill: $3.30/lb / 19.81 xp/lb
Pumpkinseed: $1.51/lb / 19.69 xp/lb
Striped Bass: $7.55/lb / 18.71 xp/lb
Peacock Bass: $10.37/lb / 18.19 xp/lb
White Crappie: $5.71/lb / 31.43 xp/lb
Black Crappie: $6.63/lb / 20.17 xp/lb

Note: These are all in lb (Pounds) I have not had the time to convert them into kg's (Kilograms), but it seems that Sturgeon is the best money ($) maker while Catfish is the best Experience (xp) maker.

Note: Do not watch this video if you do not want spoilers!