Fish yield doubles in Rajdhala beel compared to Padmai beel.
A study compared the underwater creatures in two lakes in Netrakona District. They found that one lake had more benthic fauna than the other. Worms were the most common creatures in both lakes, followed by insects. The number of creatures varied each month, with the most in December. The depth of the lakes didn't affect the number of creatures. One lake had more fish than the other.