The Hardy-Weinberg equilibrium assumes the following characteristics:
(5) is immediately not met—a population must be infinitely large, not restricted to a small lake.
(3) is also false—the adult generation does not die as soon as they give birth, thus the generations overlap.
(7) is certainly not true. are not allowed, yet the trout have mutated.
The previous point also likely negates (4)—a mutation causing vibrant coloration will attract predators. Thus, no trout would want to mate with another trout who is far more likely to be targeted by predators. Additionally, sexual dimorphism is present in all . This means that trout who have more favorable traits (e.g., speed, strength, coloration) are more likely to mate.
As for (1), mutations can cause variations in ploidy. Some trout actually can be triploid, even though it renders them infertile. However, most trout are diploid.