Have discovered one other work that might (or might not) shed a bit of
light on this obscure matter.,

Coe, Sophie, 1994. _America's First Cuisines_. Austin: University of Texas
Press.

This is in the bibliography of

Davidson, Alan, 1999 (2nd edn 2006). _Oxford Companion to Food, The_.
Oxford: OUP

and is referred to from the article on 'Maya food', which merely states
that 'there is also evidence of trade in conserved fish' and doesn't go
into further detail.

RH

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