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 dorsal area of the maturing chinook is dark black in the ocean and green to brown in rivers and streams; the large spots can be found from top to bottom of the tail fin. Chinook salmon can attain weights of 18 to 30 pounds but have been known to get over 100 pounds heavy.