This year, the theme of the day is 'Fish for Tomorrow'.

The main factors that threaten tomorrow's fish in the country are loss of wetlands due to human encroachment, siltation, drainage, pollution, excessive fishing and revenue- oriented management system that does not encourage conservation of fish.

Around 260 species of freshwater fish are now extinct due to declining sources of wetland.

To mark the day, the fisheries and livestock ministry held a press conference at its seminar room yesterday.

Speaking as chief guest, CS Karim, fisheries and livestock adviser to caretaker government, said Bangladesh was very rich in its water resources as it has huge rivers, wetlands and various types of water bodies, but these are being ruined due to lack of proper policy.

He said filling up of wetlands and other water bodies to enhance food production to meet the pressure of population increase is creating a serious natural imbalance in the country.

He also said wetland can play a vital role to reduce poverty and improve the livelihood of rural people.

"In Bangladesh, wetlands which are valuable sources of biological diversity, have been turning to wastelands due to encroachments and unsustainable use," said Ainun Nishat, a renowned water expert.

He said the biological diversity of the country would be severely damaged unless the wetlands, which covered almost two-thirds of the total area of the country, are protected.

Wetlands, which work as a life support system for the people of the country and its nature, must be protected, he added.

Nazrul Islam, director general of fisheries department, said sustainable use of wetlands must be ensured to save human life from the adverse impacts of natural calamities such as cyclones, storm surges, saline intrusions, droughts and floods.