Though freshwater fish are easier to raise than saltwater fish, most are unfortunately bland in coloration, and therefore unable to arouse the interest of consumers. As a consequence, some companies have resorted to injecting food coloring into the bodies of freshwater fish to give them a more colorful appearance.
相較於海水魚，淡水魚雖然容易飼養，無奈一般淡水魚多半色澤平淡，引不起消費者興趣，因而也有業者將食用色素打入魚兒體內，幫淡水魚增添色彩。