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.
They are the largest of the tigers, Males weigh 227 + kg (419 to 675 lbs) record weight 384 kg, body length 190 to 230 plus cm plus tail of about 60 to 110 cm long and Females body length 160 to 180 cm plus tail of about 60 to 110 cm long, Height - 107-110 cm (42-43 inches or about 3.5 feet) tall, weight 221to 368 lbs.