A fish found in rivers, especially freshwater fish that has distinctive markings or characteristics visible when viewed from above.
From 'cross' (referring to the crossing pattern or marks on the fish) and 'fish' (the animal). This appears to be a relatively obscure term, possibly dialectal or regional in origin from British naturalist tradition.
Some fish species actually have geometric patterns on their backs that look like crosses or grids—these patterns help them blend in with shadows and rocks on the river bottom, which is why 'crossfish' might describe the appearance!
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