Question

sexual dimorphism in butterfly fish​

Answer 1

Answer:

There is not an evident sexual dimorphism: males and females generally look alike, even if sometimes the male is slightly bigger. Butterflyfish reproduction starts with external fecundation, at least for the few species studied, and normally occurs at dawn, after some complex courtship behavior.

Butterflyfish reproduction starts with external fecundation, at least for the few species studied, and normally occurs at dawn, after some complex courtship behavior. Fecundated eggs will be released in the current, where they will remain until hatching. The presence of a drop of oil in their yolk sac guarantees that the newly hatched larvae will remain floating on the surface. When the larva arrives at around 5 mm of length (in a stage called 'tholichthys stage', unique among reef fishes) a bony armor covers the head, extending to form spines dorsally and ventrally. These pelagic larvae remain planktonic for two or more months, and after that period the armor is absorbed and the larva can settle at night, quickly transforming into juveniles.

Explanation:

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Answer 2

Answer:

There is not an evident sexual dimorphism: males and females generally look alike, even if sometimes the male is slightly bigger. Butterflyfish reproduction starts with external fecundation, at least for the few species studied, and normally occurs at dawn, after some complex courtship behavior.