PONOROGO Thousands of fish cultivated in floating cages in Telaga Ngebel, Ngebel District, Ponorogo Regency, East Java, have experienced sudden deaths in recent days. The cause is suspected to be due to a sudden change in water temperature and the emergence of sulfur from the bottom of the lake.
One of the cage owners, Dwi Prastyono, said that fish deaths began last Friday, peaking on Saturday and Sunday, February 2.
These mass deaths forced cultivators to bury dead fish to prevent pollutation of telaga water.
"Due to the sudden change in water temperature, many fish die. If they are not buried immediately, the water can be polluted," said Dwi, quoted from ANTARA, Friday, February 7.
Types of fish affected include tilapia, tombro, tawes, and gurame, which are cultivated in floating cages. Meanwhile, fish that are the native habitat of Telaga so far have not been affected.
To reduce the impact of losses, Dwi tries to increase oxygen levels in the lake by using a water pump.
Meanwhile, another cultivator, Hadi Santoso, added that the emergence of sulfur mixed with water also worsened the condition.
"Fishes in cages are more vulnerable than natural fish in the lake. About 50 to 60 percent of fish in cages die. This is a seasonal phenomenon, usually occurs once a year or twice. But in the last two years there has been no incident, and now it appears again," said Hadi.
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He estimates that losses of tens of millions of rupiah due to the deaths of thousands of fish that weigh a total of hundreds of kilograms to tons.
"There is no other choice, you must surrender even though you have a big loss," he concluded.
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