Daily Decay (10th February 2018)


Daily Decay (10th February 2018): Snubnose Pompano (Trachinotus blochii) @ Pasir Ris

This was one of the many casualties of a fish mass death in late February and March 2015, caused by a harmful algal bloom in the eastern Straits of Johor.

Many of the offshore fish farms in the Straits of Johor raise Snubnose Pompano for human consumption, so this carcass could have been one of the farmed fishes, instead of being of wild origin.

Malaysia: Caged fish breeders suffer major losses due to flood

13th January 2018;

The flood that hit the district early this month had not only caused damage to public and private properties, but also caused major losses to caged fish breeders here as they were left with thousands of dead fish.

Most of the breeders attributed the death of their fish to several reasons, including the strong river current on Jan 1 and 2 when the water level of Sungai Pahang began to rise.

Khaidir Ahmad, 55, from Kampung Tebing Tinggi, Lebak here, when contacted today said he suffered losses of more than RM33,000 after over 5,000 patin (Iridescent Shark Catfish) (Pangasianodon hypophthalmus) and Tilapia (Oreochromis spp.), as well as 300 kerai (Lemon-fin Barb) (Hypsibarbus wetmorei) fish, in his cages died during the flood.

He said the strong river current had caused the fish to suffer wounds as they were cornered and squeezed to the cage.

“The fish were also believed to have died due to the high turbidity level of the river which caused the fish gills to be covered with mud and deprived them of oxygen,” he said, adding that bacterial infection in the eyes and scales of the fish due to the deterioration in the water quality of Sungai Pahang was also believed to be the cause of death of the fish.

Meanwhile, Temerloh Fisheries Officer Shahidan Roslan said the Fisheries Department had taken samples from the live fish in order to determine the cause of death of thousands of caged fish of several breeders in the district.

He said the department had also informed the state Fisheries Department Bio-security Division, immediately after receiving a report on the incident.

Shahidan said initial inspection found that the death of patin and Tilapia fish was probably due to the strong river water pressure during the recent flood.

“The investigation revealed that most of the dead fish were found in the front area of the cage which might have received the high impact of the strong current,” he said.

Source: The Sun Daily

Philippines: Virus strikes Bulacan pond, kills 101,383 Tilapia – report

By Jasper Y. Arcalas, 7th December 2017;

The lethal Tilapia Lake Virus (TiLV) has arrived in the Philippines, killing 101,383 Tilapia (likely Nile Tilapia) (Oreochromis niloticus) in a lone Bulacan-based pond in June, the Department of Agriculture (DA) said.

In a notification submitted to the World Organisation for Animal Health (OIE), Agriculture Assistant Secretary for Livestock Enrico P. Garzon said TiLV killed 101,363 Tilapia out of the 300,000 susceptible population in a Bulacan-based pond, representing a 33.78-percent mortality rate.

Garzon added the outbreak was confirmed last June 29 and has already been resolved by the DA on September 15.

“An unexplained daily mortality of Tilapia fingerlings was observed in the nursery pond of a private farm after stocking on May 16, 2017. Elevated mortality after 15 days reached approximately 25 percent. Affected fish showed distended abdomen and bulging of the eyes,” he said in the notification dated November 23.

Garzon said on May 31, the DA collected samples from the affected farm and were submitted to the Fisheries Biotechnology Center (FBC) in Muñoz, Nueva Ecija.

“Semi-nested RT-PCR exhibited positive results using reported Tilapia Lake Virus [TiLV] primers. Other samples submitted to National Fisheries Laboratory- Fish Health of the Bureau of Fisheries and Aquatic Resources also showed positive results by insulated isothermal PCR [iiPCR],” he said.

The DA official added the laboratory results indicated that the “amplified 3 segment of the viral ENE [expression and nuclear retention element] has 94 to 95 percent nucleotide similarity to Israel TiLV strain.”

Garzon said the movement of fingerlings from the affected pond has been restricted and monitored. He added that the results of the last two samplings showed negative for TiLV.

On May 26 the Food and Agriculture Organization (FAO) of the United Nations warned countries of TiLV as it is considered a “lethal threat” to food security.

“The outbreak should be treated with concern and countries importing Tilapia should take appropriate risk-management measures—intensifying diagnostics testing, enforcing health certificates, deploying quarantine measures and developing contingency plans,” the FAO said.

“Tilapia-producing countries need to be vigilant, and should follow aquatic animal-health code protocols of the World Organisation for Animal Health when trading Tilapia. They should initiate an active surveillance program to determine the presence or absence of TiLV, the geographic extent of the infection and identify risk factors that may help contain it,” the FAO added.

The FAO said the TiLV poses no public health concern, but could decimate infected populations. The TiLV has been reported in at least five countries in three continents: Colombia, Ecuador, Egypt, Israel and Thailand, according to the FAO.

“Tilapia are the second most important aquaculture species in volume terms, providing food, jobs and domestic and export earnings for millions of people, including many smallholders,” it said.

“In 2015 world Tilapia production, from both aquaculture and capture, amounted to 6.4 million tons, with an estimated value of $9.8 billion, and worldwide trade was valued at $1.8 billion,” the FAO added.

Source: Business Mirror

Philippines: Virus strikes Bulacan pond, kills 101,383 Tilapia – report

Philippines: BFAR: No fish kill in Pangasinan

By Leonardo Micua, 7th October 2017;

The Bureau of Fisheries and Aquatic Resources (BFAR) has denied the occurrence of a fish kill in Sual Bay here early this week, saying it was the result of overstocking of Milkfish (Chanos chanos) fingerlings by operators.

BFAR Region 1 (Ilocos) Director Nestor Domenden said Friday two operators overstocked their cages, each one measuring 85 square meters, with 85,000 fingerlings, although it can only accommodate 45,000.

There are estimated 750 fish cages in the Sual Bay area, Domenden said.

Up to 30 metric tons of fish reportedly died from this episode, which was the result of the thinning of dissolved oxygen needed by the fish in the water, the BFAR official said.

Fish kill is commonly caused by pollution or by other contaminants.

Domenden said when an operator overstocks his cage twice the allowable number, some of the fish would naturally die as they compete for the only available dissolved oxygen in the water.

It was fortunate that the affected operators were able to harvest half of their fish before the incident, he said.

Domenden called on the local government of Sual, Pangasinan to strictly monitor the operations of fish cages to avoid a repeat of overstocking of fingerlings.

He noted that Sual had a standing municipal ordinance recommending the proper stocking of fish cages, yet it was disregarded by the two affected operators.

According to a report, the fish cages of Sual, located in a mariculture area designated by BFAR, are owned by local and foreign corporations.

All of these have a combined production of some 300,000 metric tons of fish yearly, being sold in North and Central Luzon and Manila.

Sual Mayor Roberto Arcinue has confirmed the findings of BFAR that no fish kill happened in his town.

Source: Northbound Philippines News Online

Philippines: BFAR: No fish kill in Pangasinan

Barramundi (Lates calcarifer)
Coney Island (Pulau Serangoon), 29th May 2017

Many of the offshore fish farms in the Straits of Johor raise Barramundi for human consumption, so this individual could have been a farmed fish, instead of being of wild origin.

Daily chore: Farmer Sompong Wongbao scoops dead fish from the water at Lamsae Dam reservoir in Nakhon Ratchasima.
Photo: Prasit Tangprasert

Thailand: Farmed fish dying from heat at Lamsae Dam
By Prasit Tangprasert, 19th April 2017;

Fish raised in hinged floating baskets in the Lamsae Dam lake in Khon Buri district have been dying by the hundreds as daytime temperatures rise to nearly 40°C.

Fish farmers said the deaths were probably caused by a drop in the oxygen in the water under the scorching sun.

Sompong Wongbao, 34, said that for the last three days his regular chore had been to scoop out dead and dying fish. He gave them to his neighbours, who would dry or pickle them.

He said the dead fish showed no traces of disease and he believed they simply died from the heat.

Mr Sompong said he had lost about 7,000 baht in income over the past three days.

Other fish farmers at Lamsae Dam were facing the same problem, he said.

Source: Bangkok Post

Barramundi (Lates calcarifer)
Chek Jawa, 7th May 2016

This Barramundi was one of many fishes found dead in a driftnet that was illegally laid across the lagoon at Chek Jawa.

Many of the offshore fish farms in the Straits of Johor raise Barramundi for human consumption, so this individual could have been a farmed fish that managed to escape, instead of being of wild origin.