Haor dams save crops, but drive fish to extinction

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Apart from the dams, the excessive use of pesticides and the random capture of fry also lead to the extinction of many species of fish.

25 May 2022, 12:00

Last modification: May 25, 2022, 12:03 p.m.

Two fishermen are fishing in a haor in Sunamhganj. The dams built each year in the haors of the district to save harvests harm the reproduction of fish, pushing many species to extinction. Photo: TBS

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Two fishermen are fishing in a haor in Sunamhganj. The dams built each year in the haors of the district to save harvests harm the reproduction of fish, pushing many species to extinction. Photo: TBS

The dams built every year in the Sunamganj Haors to save crops harm the reproduction of fish, pushing many species to extinction.

In addition to dams, which impede the movement of fish, the excessive use of pesticides and the random capture of fry lead to the extinction of many species of fish.

In the current season, dams 532.39 km long have been constructed at a cost of Tk 124 crore in Sunamganj, according to officials.

According to Professor Mrityunjoy Kundu, Head of Aquatic Resources Management Department at Sylhet Agricultural University (SAU), unplanned construction of dams is the main reason for the decline in fish numbers in haor areas.

A recent visit to Tahirpur market, which is close to one of the largest haor in the country – Tanguar haor, revealed that most vendors sell farmed fish including Pangash, Telapia, Pabda and Koi.

Due to heavy downpours and heavy rains in March every year, floods occur in the haor region and the paddy crops are flooded. Crop protection dams are constructed in such a way that flood waters do not enter the haor and damage the paddy.

“These dams, built to protect the paddy fields, prevent the fish from breeding. Also, the fish cannot move in the water. That is why the volume of fish in the haor is decreasing,” Sarwar Hossain said. , Fisheries Officer of Tahirpur. .

“Another reason is the excessive use of pesticides, which hinders natural reproduction,” he added.

Dr. Nirmol Chandra Roy, Head of Department of Fish Biology and Genetics at SAU, said: “We should focus on both paddy and fish.

According to data from the district fisheries office, a total of 90,130.25 tons of fish came from different water bodies in Sunamganj – some 34,134.07 tons came from haors, 28,624.39 tons from beels and 4,544 .45 tons from the rivers.

Many endangered species

According to data from the Sylhet Fisheries Office, until twelve years ago some 107 species of fish were available, but over the years many species have disappeared. A recent survey revealed that 32 of the 107 species are already extinct.

The survey classified the fish into three categories – vulnerable, endangered and critically endangered.

Some of the critically endangered fish species include Tatkini, Gharua, Baghair, Rita, Rani, Pangash, Bamosh, Naftani, Chital, Ekthuti and Chaka.

Threatened species include Bacha, Chepchela, Dhela, Bamboo Leaf, Kunche, Napte Koi, Batasia Tengra, Foli and Gujiaayr.

And vulnerable species include Gulsha, Gonia, Darkina, Aayr, Pabda, Borobaim, Gajar, Tarabaim, Titputi, Nama Chanda and Kalibaush.

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