The stream inside the country without sea where fishes are available is known as internal stream. Internal stream are of two types. Open stream and stagnant stream. Rivers, swamp, lake, inundation land etc are internal open stream. And the stagnant stream are pond, mere and coastal area. The total area of open stream is 4.047 million hector, pond and lake 0.147 million hector and coastal area 0.143 million hectors.
Vast sea stream located in the southern part of Bangladesh, where about 480 km coastal area and 200 notical mile economical area. Nowadays the fisherman catch a large number of fish from this zone. Fish are not cultivated in sea stream. Only collect fishes which grows naturally.
There are also other types of stream which are described below.