Question

Common characters and sexual dimorphism of fresh water and marine aquarium fishes such as guppy, molly, gold fish, angel fish, blue morph, puntius conchonius and barilius bendelisis

Answer 1

Sexual dimorphism is the condition where the two sexes of the same species exhibit different characteristics beyond the differences in their sexual organs. The condition occurs in many animals and some plants. Differences may include secondary sex characteristics, size, weight, color, markings, and may also include behavioral and cognitive differences. These differences may be subtle or exaggerated, and may be subjected to sexual selection. The opposite of dimorphism is monomorphism.

Answer 2

Common characters:  

1. Both fresh water and salt water fishes have a completely developed skeletal system. Most sea fishes have cartilage made skeletal system and fresh water have bony skeletal system
2. They both have pair of gills as respiratory organs. The sea fishes have open gills and they fresh fishes have covered gills.
3. Sexual dimorphism means the difference in the morphology of the male and the female fishes. Usually in fishes the females are slightly more in size as compared to males . But, many fishes both sea and freshwater are hermaphrodite in nature.

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