Xiǎo yú shēnshàng de zǐyìn shì jiǎnyì hégé de biāoshì.
The purple mark on the small fish indicates that it has passed quarantine.
Tips
usage
Not a fixed dictionary word. 紫印 is compositional (紫 purple + 印 mark/seal/stamp) and circulates mainly as a brand or product name and as an ad-hoc descriptive compound for a purple blotch, brand-mark, or quarantine seal.
