The question below consists of a set of labeled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.
P. The demand for fish has increased.
Q. However, adequate fish is not available in the lake.
R. This is mainly because the migratory fish from Chindwin-Irrawaddy river system to Manipur river system have declined steadily after the barrage came up.
S. At least two lakh people are directly dependent on the lake for fishing.