Write a summary of the following passage:- Bangladesh is blessed with huge inland open water resources. It has numerous rivers, canals, beels, lakes, and vast areas of floodplains. Hakaluki haor is one of the major wetlands of Bangladesh. With a land area of 18,386 hectares, it supports a rich biodiversity and provides direct and indirect livelihood benefits to nearly 1,90,000 people. This haor was declared an Ecologically Critical Area in April 1999 by the government of Bangladesh. Hakaluki is a complex ecosystem, containing more than 238 interconnecting beels and jalmahals. The haor falls under two administrative districts, Maulvibazar and Sylhet. Some 1,90,000 people live in the area surrounding the haor. Hakaluki haor is an important source of fisheries resources for Bangladesh. Kalibaus, Boal, Rui, Ghagot, Pabda, and Chapila are the main fish species found here. From the Kushiara, there are frequent upstream movements of fish towards the beels and tributaries of Hakaluki. The beels in Hakaluki haor provide winter shelter for the mother fisheries. In early monsoon, these mother fisheries produce millions of fries for the entire downstream fishing communities. Floodplains are also an important source of fisheries resources within the area. However, many of the beels have lost their capacity to provide shelter for mother fisheries because of sand deposits from upstream rivers and canals, use of complete dewatering technique for fishing and lack of aquatic plants to provide feed and shelter for parents fish.