A diagram includes symbols: 'A' for Possible ancestor, 'B' for Contemporary brown form of gold fish, 'G' for Contemporary gold form of gold fish and Arrow shows possible line of descent. The Illustration includes two hypothesis:

1. Hypothesis A - For lake 1, 'A' descents to 'B' and 'G'. For lake 2, 'A' descents to 'B' and 'G'.
2. Hypothesis B - For lake 1, 'A' descents to 'B' and 'B' of lake 2. For lake 2, 'A' descents to 'G' and 'G' of lake 1.