1B} 
A female edible crab becomes mature for the first 
time, and produces spawn, when it is about five inches 
broad. 
Rate at which the Shrimp Breeds — 
The shrimp produces on the average about 5,000 eggs. If 
there were no destruction in the sea, and all these eggs 
developed into young shrimps, then starting with a single 
pair of shrimps— 
one male shrimp | 
. - 1st generation. 
one female shrimp |) 
The female spawns 5,000 eggs, which develop into 
4000 females | 
- Ynd generation. 
and 1000 males ) 8 
At the next spawning each of these 4,000 females will 
spawn 5,000 eggs, that is 4000 x 5000=20,000,000, and 
they will develop into 
16,000,000 females | ard kj 
, - 3rd generation. 
and 4,000,000 males — } 3 4 
At the next spawning again each of these 16,000,000 
females will spawn 5,000 eggs, that is 16,000,000 x 5000 
=80,000,000,000, and these will develop into 
64,000,000,000 females ie Paes ea atc 
and 16,000,000,000 males ) °° 
Thus if we start with two shrimps, and imagine that they 
only breed once in their lifetime, and that all the eggs 
come to maturity, then in the fourth generation we shall 
have 80,000 millions of shrimps, and at the fifth genera- 
tion there would be spawned 820 billions of eggs. 
