The blackspot angel fish can changes sex from female to male. The male fish is blue in colour and the female fish is yellow in colour. The male angel fish is the strongest and the largest member in the group. The male fish is the one which protects and looks after the female fish (like a security guard). When the male dies, the group needs protection. The largest female fish in the group grows larger in size, starts changing colour from yellow to blue and becomes completely male in two weeks.
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