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Vietnamnet Bridge: Shrimps fed mam leaves are bigger and healthier

Update: 10-05-2010 | 00:00:00
 

VietNamNet Bridge - Shrimp farmers in southernmost Ca Mau Province who use the leaves and branches of mam trees (Avicennia) - a species found in abundandance in southern Viet Nam - to feed shrimp are earning high profits.

 

    Mam tress (Avicennnia) 

In 2000, Nguyen Van Bong, who became the first farmer in his commune in Nam Can District to use the mam tree as feed, said the practice meant that shrimp did not develop disease and were larger than those fed by other methods.

 

Bong used one 1.5-2 metre-long branch for every 4 sq. metres of pond surface area.

 

Bong said during wartime many people ate mam fruit to replace rice and the elderly chewed the leaves instead of betel leaves.

 

"I thought if people could eat mam leaves, the shrimp could too," he said.

 

Nguyen Thien Thuc, head of Xom Lon Trong hamlet, said several families had followed in Bong’s footsteps and were earning high profits.

 

"I’ve also learned Bong’s method and earned about VND5-7 million for each shrimp harvest," Thuc said.

 

Sau Hung, who lives in Hang Vinh Commune’s Hamlet 4, has also bred shrimp with mam leaves for about two years.

 

Hung said his shrimp were also bigger than those raised with other feed.

 

Shrimp breeders in communes in Ngoc Hien, Phu Tan, Dam Doi districts have also used mam leaves to breed shrimp.

 

A Can Tho University analysis of the water from the ponds showed that in ponds with water salinity of 1 per cent, mam bark and leaves decayed after five to seven days and released nutrients eaten by larva and microrganisms, which, in turn, were eaten by shrimp, according to Nguyen Cong Quoc, head of the Ca Mau Province sub-department of aquaculture.

 

In addition, mam leaves contain protein and enzymes that are good for the digestive system of shrimp and help them grow.

 

Mam leaves help to attract algae species which benefit the growth of shrimp, said

 

Tran Ngoc Hai, an associate professor with Can Tho University.

 

He warned, however, that the content of dissolved oxygen in ponds could fall and the water could become polluted if too many mam branches and leaves were put in ponds.

 

Source: VNS

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