From the Canadian perspective, it isn't the fish's decline, it is that their coral-forests-breeding has been wiped-out by dragger-nets, & the fishery's permanently broken, because that takes about a century to grow back to a height of 2-dm, & they rather probably need more than that, to be breeding in??
Dragger-nets are marine-ecology "carpet-bombing".
No gov't will outlaw such idiotic destructiveness, & so .. therefore the predicted-in-the-Christian-bible marine-foodchain-collapse, that our "management" of our world's oceans is in the process of producing, will happen, later this century.
< shruggeth >
Humankind's choice..
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