Every spring when their breeding season comes around, the pufferfish swim up the Yangtze, Liao and Bai Rivers. This is why when Su Dongpo wrote: "When the river flows warm in spring, the ducks are the first to know," he followed it with the line: "This is when the pufferfish yearn to swim upriver."
每逢春季繁殖期，東方魨由南而北，上溯長江、白河、遼河，所以蘇東坡說完「春江水暖鴨先知」，接著垂涎欲滴的就聯想到「正是河豚欲上時」。