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Not sure if intended or not because the different "cooking procedure" (being turned into wobblegong oil)

Edit: Example

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almost 4 years ago - /u/JagexRowley - Direct link

This is intentional. It's part thematic (because wobbegongs don't have a cooked variant, you make oil from them - i.e. there is no 'cooked wobbegong' you can eat), but primarily it is due to how fish oil and shark oil can be made with varying amounts of fish/shark. There would be no good/fair way to balance how much oil to give (well, specifically fish oil, but it made sense to exclude shark oil too).