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.
Shoulder Height: 120-150 cm / 4-5 ft. Tail Length: 40-45 cm / 16-22 in. Weight: 120-240 kg / 264-528 lb. The short coat is yellow-brown in females, and gradually turns blue-grey in males as they mature. There is an erectile mane on the nape and back and a hair pennant in the middle of the underside of the neck.