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Is it possible that river fish need to be stronger swimmers because they are more likely to have water currents to contend with? There was a fish I used to eat in Uganda (locally called ngege but I think it's what we call Tilapia) that had 2 spines, 1 above the other, connected by many tiny ribs.
They select the most popular (less bony).
Where do yo get the idea that the number of bones is different? The salmon you ate was probably filleted.