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.
The calf is about 8 ft. (2.4m) long and weighs about 300 to 400 lb. (131-181 kg). The light areas of some young killer whales may be creamy white to lemon yellow rather than white. This color usually turns white by the age of one year. In the first few days after birth, the dorsal fin and tail flukes gradually stiffen.