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.
Dead fishes at Lim Chu Kang, 19 Jul 2016
By Ria Tan, 19th July 2016;
I checked up on Lim Chu Kang Jetty again. There are no freshly dead fishes, but the ‘old’ dead fishes are still there. And once again, I saw a truckload of expired biscuits being delivered, probably to be fed to the farmed fishes.
Why are hundreds of dead fishes washing up at Lim Chu Kang? The explanation given to the media so far, no fish losses “beyond normal losses”, deaths attributed to low dissolved oxygen and not to plankton bloom. But how can this be “normal losses” when we don’t normally see this many dead fishes washing up at Lim Chu Kang? And even if they were “normal losses” why are farms allowed to dump their dead fishes into the sea?
Source: Wild Shores of Singapore
- Dead fishes along coastline at Lim Chu Kang jetty on July 18.
- Large numbers of dead fish were found near Lim Chu Kang jetty on July 18.
- Workers pushing trolleys of dead fish along Lim Chu Kang jetty on July 18.
- Dead fish floating on the water near Lim Chu Kang jetty yesterday. Fish farmers blamed the deaths on low levels of dissolved oxygen in the waters of the West Johor Strait, along which about 50 fish farms are located.
Photos: Lim Yaohui
Lim Chu Kang fish deaths ‘due to low oxygen levels’
Fish farms not badly affected; AVA had sent alert last Friday about risk
By Goh Yan Han, 19th July 2016;
Large numbers of dead fish were found near Lim Chu Kang jetty yesterday morning, washed up on the shore or afloat at sea.
Fish farmers attributed the deaths to low levels of dissolved oxygen in the waters of the West Johor Strait, along which about 50 fish farms are located.
The chief executive of The Fish Farmer, Mr Malcolm Ong, 52, told The Straits Times: “According to my monitoring system, dissolved oxygen levels in my farm have been decreasing since July 8.
"There was a marginal increase on July 12 but after that, it came down again and has remained low since. We have been prepared and our staff are on 24-hour standby.”
“As we are not near an open coast, water is slow moving such that dissolved oxygen levels deplete more quickly,” he said.
Fish Farmers Association of Singapore president Timothy Ng said such occurrences are frequent in the Lim Chu Kang area. He said: “Unless the environment improves in terms of water flow, this will recur from time to time and I’m not sure how it can be stopped.”
Farms tend to install aerators that churn the water and ensure there is sufficient supply of dissolved oxygen when levels are low, although these are not always sufficient to prevent deaths.
However, none of the farms contacted by Mr Ng or The Straits Times suffered serious losses.
Dissolved oxygen levels can also differ from farm to farm, said Mr Ong, who monitors the levels and uses pumps and aerators to mitigate any negative impact on his farm. His farm has had several baby fish deaths this past week, a normal occurrence when dissolved oxygen levels are low.
According to Mr Ong, the Agri-Food and Veterinary Authority (AVA) sent out an automated alert last Friday about the possibility of low dissolved oxygen levels, and asked farmers to be vigilant. AVA did not respond to queries by press time.
Both Mr Ng and Mr Ong ruled out the possibility of a plankton bloom as a reason for the low levels of dissolved oxygen.
In February last year, a plankton bloom, which gobbles up oxygen in the water, killed an estimated 500 to 600 tonnes of fish, affecting 55 out of 63 fish farms along the East Johor Strait.
Farms in the Lim Chu Kang area were also severely affected by a plankton bloom in March last year, with one of the farms losing all 35 tonnes of its fish.
Source: The Straits Times
Dead fishes at West Johor Strait, 17-18 Jul 2016
By Ria Tan, 18th July 2016;
Hundreds of dead fishes have been seen washing up at West Johor Strait over the last two days.
Most of the dead fishes were about the same size and look like the Milkfish (Chanos chanos) farmed by the largest fish farm in that area. Has there been another mass fish death among the fish farms in the West Johor Strait? If so, what caused it? What does this mean for public health? What can and has been done to improve ecosystem health in the area to prevent a recurrence?
Yesterday (17 Jul 2016), at around 10.30am today, a concerned nature lover shared sightings of what looked like hundreds of dead fishes floating into Sungei Buloh Besar with the incoming tide. I only managed to get there around 3pm and the tide had already gone down. So I saw only some dead fishes at Sungei Buloh Besar as well as the Kranji extension. Most of the dead fishes were about the same size and look like the Milkfish farmed by the largest fish farm in that area. Here’s more photos in this Facebook album.
Source: Wild Shores of Singapore
- Dead fish spotted at Lim Chu Kang jetty on July 18, 2016.
- Dead fish floating on the water at Lim Chu Kang jetty on July 18, 2016.
- Workers pushing trolleys of dead fish along Lim Chu Kang jetty on July 18, 2016.
Photos: Lim Yaohui
Scores of dead fish found at Lim Chu Kang jetty
By Sanjay Nair & Lim Yaohui, 18th July 2016;
Scores of dead fish were spotted at Lim Chu Kang jetty on Monday (July 18) morning.
When The Straits Times visited the scene, the fish were seen either floating belly-up on the water or washed up along with water bottles and other rubbish along the shore.
A pungent smell emanated from the area, as well as from several black plastic bags at a rubbish bin nearby.
A boat belonging to the Agri-Food and Veterinary Authority (AVA) was docked at the jetty, while a “kelong”-like structure was combing through the water for checks.
Dead fish were also discovered by The Straits Times at Sungei Buloh Wetland Reserve on Monday, but in smaller numbers than at Lim Chu Kang.
The Straits Times has contacted AVA for more information.
This is not the first time that mass fish deaths have happened at a park or reservoir here. Last July, hundreds of dead fish were seen in a stream in Bishan-Ang Mo Kio Park, believed to be due to the hot and dry weather.
Source: The Straits Times
- This morning, at around noon, I arrived at Lim Chu Kang Jetty. Dead fishes dotted the water between the fish farm and the shoreline, and there was a long line of dead fishes on the tideline for this morning.
- Where are the dead fishes? Just walk a few metres down the shore, just beyond sight of the Jetty, a long line of dead fishes. Out of sight but not out of smell.
- Deeper in the mangroves, the dead fishes and the trashline has yet to be cleaned up.
- Although the high shores of the mangroves look unusually clean.
- Most of the fishes look like farmed Milkfish and were about the same size. I saw one Spotted Scat, but no other wild fish.
Hundreds of dead fishes have been seen washing up at West Johor Strait over the last two days. Most of the dead fishes were about the same size and look like the Milkfish (Chanos chanos) farmed by the largest fish farm in that area.
Has there been another mass fish death among the fish farms in the West Johor Strait? If so, what caused it? What does this mean for public health? What can and has been done to improve ecosystem health in the area to prevent a recurrence?
While there appears to have been a good effort to clean up the shores of dead fishes and litter, this effort ends a few metres away. Where dead fishes and litter in a long line along the tideline remain on the shore. Out of sight but not out of smell.
While it’s good to see the effort to keep the place clean and get rid of the dead fishes, AVA should go beyond cleaning up only what can be seen from the Jetty.
There should be an equal effort to understand the underlying causes of repeated and regular mass fish deaths, and to work with all stakeholders to resolve the issues.
More in this blog post http://wildshores.blogspot.com/2016/07/dead-fishes-at-west-johor-strait-17-18.html
You CAN make a difference: Dead Fish Alert!
Please help me monitor dead fishes washing up on the Johor Straits. Please let me know if you see large numbers (more than 10) especially of large dead fishes (more than 20cm long) washing up on the northern shores such as Pulau Ubin, Lim Chu Kang, Sungei Buloh, Kranji, Woodlands Waterfront, Sembawang, Punggol, Lorong Halus, Pasir Ris, Changi.
There are too many shores for me to personally check, so I really appreciate any info or photos that you can share. Thank you!
Source: Ria Tan Facebook