This isn't quite exact, but 1/4 cup of butter (so a half stick if you're in the US) is 57 grams according to the conversion chart from allrecipes below. So use just a slightly heavy 1/4 cup or 1/2 stick.
Yellowtail, including Yellowtail Jack (Seriol landei), are recognized by a yellow stripe across their body and their yellow tail. Range & Habitat: Yellowtail is caught year round, but more commonly during summer in the Pacific Coast and the Sea of Cortez. They are caught primarily with hook and line, and their average weight is 10 to 20 lbs.
There are various mutations of this species, including the white tiger and the black tiger (which has white or yellow stripes on a black coat). Male Bengals weigh an average of 221 kilograms (or just under 490 pounds), while females average 140 kilograms, which is equivalent to about 308 pounds.