In English
“a fisherman never says his own fish stinks”
Meaning
'Fishaman neva seh him fish stink' — a fisherman never says his own fish stinks. No one criticises or speaks ill of their own goods, work, or interests, the proverb observes: a seller always praises what they have to sell, so you should take their own glowing account of it with a good deal of caution. It is shrewd, worldly wisdom about self-interest and salesmanship, warning the listener to judge a thing for themselves rather than trusting the word of the one who profits by talking it up.
Examples
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Of course him seh di car good — fishaman neva seh him fish stink.
Of course he says the car is good — no seller runs down their own goods.
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She praise up har own cooking; fishaman neva seh him fish stink.
She praises her own cooking; nobody bad-mouths their own product.
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Nuh tek di salesman word alone; fishaman neva seh him fish stink.
Don't take the salesman's word alone; a seller always praises their wares.
Origin
A market image: a fish-seller will never admit their catch has gone off, however old it is — a figure for how everyone talks up their own goods.
How it’s used
A caution against trusting people's praise of their own goods or interests.