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.
In the winter season of northern areas the long tailed weaselâs fur becomes white; sometimes a few yellow tints can also be observed. However, even in this phase its tail tends to retain the black tip. Weight: On an average, the males weigh about 225 grams; while females are around 102 grams in weight.