Crustaceans especially crabs are rich in protein and also known as poor man's protein. Worldwide population was increasing year by year and feeding billion people through aquaculture. So crustacean rearing has become significant and developed culture methods. On the other hand crustacean industry has its own complications like availability of quality yield etc., in addition to lack of ways to enhance the growth of animal. In crabs the vegetative growth (somatic growth instead of reproductive) of the animal is regulated by special process called molting that is shedding of old exoskeleton and synthesizing of new exoskeleton, which is required for ever growing body size. In natural molt cycle animal is allowed to undergo molt and varies depends on species, season and is mediated by Ecdysteroids secreted from Y-organ
Hello Khaled; The exoskeleton of arthropods is inelastic - the animals' container is rigid. Thus the animals can't grow unless they periodically produce a new, larger exoskeleton. Best regards, Jim Des Lauriers
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