Translated literally means black cat! A nickname I was ‘proudly’ given one year on the Rio Grande due to the size of the leech I was throwing around. Basically, it looks like you are trying to throw a black cat around for the sea trout! It is a long fly, but it is light and the profile makes it easy enough to turn over. Sometimes they want it big, it is that simple. When they do, make sure you reach for this pattern – I have lost count of the fish I have landed on this pattern. It is such a consistent producer when the session is almost at an end and you have to rely on one pattern to produce the goods when every cast counts.