25 grams of small yellow croaker is one or two small gold bars, which is equivalent to 3 1.25 grams now. So the small goldfish gold bar weighs 3 1.25 grams.

Gold bars are investment varieties in the gold market, physical gold investment and gold investment derivatives derived from physical gold. Derivatives mainly include gold futures, gold options, etc. Physical gold investment mainly includes gold bars, gold coins and gold ornaments. Gold bars come from ancient currency circulation and are more used in the fields of collection and investment. Major banks and financial institutions around the world reserve and circulate their own signature gold bars, such as the standard gold bars of Shanghai Gold Exchange. Gold bars are divided into ounces of gold and grams of gold, and the international gold bar is 400 ounces (12.5 kg).