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 average weight varies from 0.25-0.90 kg. Black crappie are a monomorphic species characterized by 7-8 dorsal spines which are stepped in length, an upturned (S-shaped) snout, symmetrical dorsal and anal fins, a wavy light and dark pattern on non-paired fins, and a mottled (spotty) color pattern.