Tuesday, August 16, 2016

16/08/2016: Introducing sea bass to reduce tilapia invasion of 'bangus' ponds, Philippines

Government marine experts have released 5,000 sea bass fingerlings into the Watac-Mamalingling River, Philippines - according to an article published recently by The Inquirer.

Image: Keith Bacongco
This has been done in an effort to control the growing population of tilapia (locally referred to as molmol) that had invaded the city’s milkfish (bangus) ponds. Westly Rosario, chief of the National Integrated Fisheries TechnologyDevelopment Centre here, said the sea bass is a natural predator of the invasive tilapia. 

The fish had also been referred to as “tilapiang Gloria,” after the diminutive former President and now Pampanga Rep. Gloria Macapagal-Arroyo. “We call this a biological control. You introduce another species that can eat the undesirable species,” said Mr Rosario.
    Molmol is a smaller version of the ordinary tilapia that invaded fishponds in Pangasinan province early last year, prompting bangus growers to complain of losses. 

This city produces what is known as the tastiest and juiciest bangus in its more than 900 hectares of fish ponds. 

Mr Rosario said bangus growers had tried to control the growing population of molmol by using chemicals, but the invasive fish had continued to thrive.

To prevent molmol from multiplying, bangus growers dry the pond bottom and apply tea seed or tobacco dust, a natural pesticide, to kill the pests. "If drying the pond is not feasible, its gate must be fitted with fine mesh net," Mr Rosario said, adding that, "the flow of water should be impeded with either wooden boards or mud."

Read more HERE.

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