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 sudden explosiveness of the strike will excite even the most experienced fishermen. The lake holds Tilapia max.2kg (4.4lb) Rohu max 6kg (13lb), Mud Carp max 6kg (13lb), Giant snakehead to 9kg (19.8lb) but the main attractive species is the Hampala Barb also called Jungle Perch max. 5kg (11lb), the average size is 1kg (2.2lb) and a 3kg (6.6lb) fish is already a very good catch.