1. In the year 1950 the population of bass fish was less than 100.
2. Year after year I slowly increases its population till 1980.
3. In the years 1970 - 80 the population went on a rapid growth.
4. But at the same time in the years 1980 - 90 a flat growth happens, that means no more population increases except a little bit growth. At last after the years 1990 - 2000 a reverse cycle happened due to various reasons.