Malaysia: No reason found yet on why lobsters, fish in Oya River died


Source: Berita Harian

22nd February 2018;

The mass surfacing and and subsequent dying of aquatic life, particularly lobsters prawns and fish, in Oya River, Dalat that went viral on social media could have been caused by many factors, including poisoning.

Nanoplankton specialist Musa Musbah said 20 to 30 years ago, such phenomenon occurred not only in Dalat river but also in other rivers in Sarawak including in Niah and Sibuti areas in Miri, with varying degrees.

He was asked to comment on the so-called ‘drunken phenomenon’ of aquatic life in Oya River, which drew many comments on his Facebook page.

Musa reminded those who doubted the safety of such prawns or fish sold in the market to temporarily avoid eating them until the authorities come up with their findings and give assurance that whatever is caught from the river is safe to consume.

He did not deny that there might be some individuals who used poison to catch fish and prawns due to ignorance on its impact on health, while there might be others who did it for quick profit.

Meanwhile, Natural Resources and Environment Minister Dato Sri Wan Junaidi Tuanku Jaafar was reported in the local media as saying that the Department of Environment (DoE) would investigate and study the causes of the phenomenon.

Source: The Borneo Post

Those are not lobsters, but Giant River Prawns (Macrobrachium rosenbergii), while the fish in the photo appears to be a Helicopter Catfish (Wallagonia leerii).

 

Officers suspect that the high temperatures caused hypoxia in the pond, killing the shrimp and fish.
Photos: Kritsada Mueanhawong

Thailand: One tonne of dead fish found in Phuket park
By Kritsada Mueanhawong, 22nd April 2016;

A large number of fish and shrimp have died in a pond in Suan Luang Park in Phuket Town from either a rise in temperature or polluted water, confirmed officials.

“The local community around the park has complained about the dead fish,” said Phuket City Deputy Mayor Thavorn Jirapattanasophon. “About one tonne of dead fish have been found since Wednesday, including Java Barb (Barbonymus gonionotus), Catfish (Siluriformes), Snakehead (F. Channidae), Nile Tilapia (Oreochromis niloticus), shrimp and numerous others.”

Mayor Thavorn headed the clean-up project, directing officials to collect water samples from the pond, so the water quality could be tested.

“Our initial tests suggest that the water is safe,” said Mayor Thavorn. “It is most likely that due to the high water temperatures, there is a lack of oxygen in the pond, which is causing this phenomenon.”

Similar incidents have taken place several times in the past.

On March 23, it was reported that Krabi officials had to bury about five tonnes of dead fish that died under similar conditions (story here).

Source: Phuket Gazette