Sunday 13 January 2013

The amazing life cycle of the American lobster


Lobsters begin life as tiny individuals whisked away by strong ocean currents. How they manage to survive is unbelievable, but how they come to be is also an interesting story. It all starts at the bottom of the ocean, during the summer months, and it lasts nearly two years before microscopic larvae start floating in the seawater. It took many studies by several scientists to truly determine what happens. And we are still not sure if we have the complete story, as lobsters are very reclusive and spend the majority of their secret lives on the seafloor. But here is their story, as we know it.

It’s early spring and the weather is finally warming up. The water temperature in the ocean is also increasing, and the lobsters feel it. They start a small migration towards the coast, to be in shallower waters. Females then encounter a number of males during this trip, and mating season is finally upon them. They will want to mate with the dominant male in the area, and they know who is the likely candidate, simply by smelling him. The dominant male is the one winning all the territorial battles in the neighborhood, and strangely enough, he is able to alter his urine to smell victorious. Females can detect this smell using their small antennules, located between the larger antennae, and line up in front of this male’s rock house to have a short 5-day romantic encounter with him.
If the chemistry is right between them, the female molts inside the rock house, and the male gently rolls her over and mates with her while she is still soft. Her new shell will harden only after a week or so. But having a soft shell enables her to accept and store his sperm inside a little pocket located outside her shell under her body. After a few days, the love affair is over, and the female returns to her own rock house.

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