The table below lists the loss (or profit) made from buying raw fish, and selling the cooked fish. All prices are based from the Grand Exchange Market Watch.
Remember: Some fish will be burnt thus affecting the profit/loss per experience. For example manta rays at level 99 with cooking gauntlets, will burn approximately 23% of the time, leading to an expectation of −144.29 per fish and a true cost per xp of −0.67. However, this can be mitigated by wearing the Cooking Cape after you have achieved level 99.
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Level Raw fish GE Price Cooked fish GE Price Profit XP Profit/XP 1 Raw shrimps 49 Shrimps 24 −25 30 −0.83 1 Raw anchovies 85 Anchovies 100 15 30 0.5 1 Raw sardine 54 Sardine 6 −48 40 −1.2 5 Raw herring 92 Herring 8 −84 50 −1.68 10 Raw mackerel 55 Mackerel 18 −37 60 −0.62 15 Raw trout 69 Trout 18 −51 70 −0.73 18 Raw cod 75 Cod 10 −65 75 −0.87 20 Raw pike 101 Pike 19 −82 80 −1.02 25 Raw salmon 115 Salmon 114 −1 90 −0.01 28 Raw slimy eel 85 Cooked slimy eel 85 −254 95 −2.67 30 Raw karambwan 434 Cooked karambwan 544 110 190 0.58 30 Raw tuna 48 Tuna 43 −5 100 −0.05 35 Raw rainbow fish 212 Rainbow fish 69 −143 110 −1.3 38 Raw cave eel 568 Cave eel 267 −301 115 −2.62 40 Raw lobster 210 Lobster 167 −43 120 −0.36 43 Raw bass 457 Bass 200 −257 130 −1.98 50 Raw swordfish 350 Swordfish 324 −26 140 −0.19 62 Raw monkfish 357 Monkfish 462 105 150 0.7 80 Raw shark 732 Shark 921 189 210 0.9 82 Raw sea turtle 912 Sea turtle 1,038 126 212 0.59 84 Raw anglerfish 1,443 Anglerfish 1,577 134 230 0.58 90 Raw dark crab 1,082 Dark crab 1,196 114 215 0.53 91 Raw manta ray 1,009 Manta ray 1,123 114 216 0.53