Abstract
Shrimp plays a significant role in the development of the national economy of Bangladesh. Farmers in Bangladesh have chosen bagda (Penaeus monodon) for coastal aquaculture due to its high export value in the international market. Therefore, coastal poor people have collected wild bagda post-larvae (PLs) for the last two decades. It is estimated that about 12,890 children are permanently and/or temporarily engaged in shrimp seed collection in greater Barisal and Khulna districts, of whom 76% (9,750) are girls and 24% (3,140) are boys. In Cox's Bazar and greater Noakhali districts, 1,590 children are engaged in this job, with 21% (340) girls and 79% (1,250) boys. Another 10,000 children are involved in shrimp and fish catching, sorting and drying in Dublarchar island, located 170 km south of Khulna city. It is also located 180 km from the Mongla port in Bagerhat district which is used as a fish landing centre. In addition, more than 1,500 children are also engaged in collecting snails and clams, which are used as a popular feed, particularly for galda chingri (Macrobrachium rosenbergii).
Nitrite oxidizing bacteria for water treatment in coastal aquaculture system