Thousands of fish cages owned by farmers in Kedung Ombo (WKO) Ngargotirto Village, District Sumberlawang, Sragen again died suddenly. Earlier in September 2014 and it had occurred sudden fish death. It is not certain because the fish was dead, but provisional estimates due to lack of oxygen.
Village Head Ngargotirto, Sumberlawang, Daryono revealed, dozens of tons of fish belonging to farmers in a village hamlet Ngargotirto died suddenly that most types of tilapia and tombro. While catfish can still survive. As a result of these events is estimated tens of fish farmers lose hundreds of millions of dollars.
“My neighbor who had cages in WKO already told me, but so far there has been no detailed reports. I also have not had time to check the field, “he said, Tuesday (2/12).
Daryono tell from the recognition of a fish farmer, conditions WKO fetid water before the fish died. He said the fish farmers spread in several hamlets, including Hamlet Ngasinan, Canyons Gandul, Spring Bulus, Ngargorejo and Kowang. However, the number of fish farmers most in Hamlet Ngasinan.
While the Head of Department of Animal Husbandry and Fisheries Sragen, Agus Purwanto, claimed to have received a report related to the death of fish in WKO. He claims to have issued a circular (SE) to the fish farmers to immediately harvest of large fish.
Agus explained death of fish in WKO events regularly occur in August and December. The cause is suspected because of the lack of availability of oxygen in the waters.
“It’s also because of the very cold temperature changes. Usually these fish die midnight. Occurs vertical vortex of water that raised the mud at the bottom of the reservoir to the surface of the water, so that the oxygen depleted, “said Agus.
Rain twice in two days in the Gajah Mungkur Solo, Central Java, a catastrophe for farmers fish cages. Hundreds of thousands of fish farming cages died suddenly. Death is due to the supply of oxygen in the water content is not adequate, and also mixing the water with sand.
Fajri, one farmer floating fish cages Gajah Mungkur to Media Indonesia said it is feared the death of the fish will continue, because the rain is believed to still be carrying mud and sand. It’s given the volume of water in the reservoir has not been adequate.
“The rain will come in the next few days, we fear will still add to the number of tilapia and catfish die. Because water reservoir volume shrinkage is still remarkable, and far short of expectations. But we have to admit, this is an annual cycle of any change of seasons or transition, “he added, Wednesday (11/12/2014).
So far, according to Sardi, other cage fish farmers in WGM, there is no alternative solution to anticipate the current fishing mortality transition season. And losses arising from the death of catfish and tilapia in floating cages WGM each year, could reach billions of dollars.
What is clear, WGM floating cage fish farming can only be normal again after the elevation of water reservoirs are in the normal position. Throughout still shrinkage, and was in critical condition such as this, the number of dead fish every day they reach one to two tons.
“Farmers fish cages have experienced huge losses due to the impact of this change of seasons in 1995, in which the number of dead fish reached 100 tonnes,” said Fajri.
The death of thousands of fish that occur evenly in almost all regions Kedung Ombo. For example, in the village of Ngasinan Ngargotirto, regency, Central Java. According ardiansyah, one fish farmers, the majority of dead fish is a seed that is not strong durability.
“The fish that died were mostly seed indigo and gold. But, the fish are harvested too many died due to heat in the area Kedung Ombo,” said Ardiansyah, farmers fish cages in Ngasinan, District Sumberlawang, Sragen, Monday (09/22/2014) .
Hot weather where temperatures sometimes reaching more than 40 degrees Celsius, leading to 3 tons of fish seed to 2 months of age her, dead. While the fish are ready to harvest the dead about 1 ton.
In the area there are about 100 Ngasinan themselves members of a group of farmers cages, with a total production of about 10 tons. Death of fish farming has been going on for the past week, with the dominant types of tilapia and gold because it is not heat resistant.
Currently cage farmers try to survive by developing a more resistant catfish hot weather. “Actually, the price of gold fish seed is currently quite expensive, at $ 38 thousand per kilogram. The indigo Rp 20 thousand to $ 23 thousand per kilogram,” said Ardiansyah.
While the price of tilapia ready to harvest now about USD 19 thousand to $ 20 thousand per kilogram. In addition because of the hot weather, drought currently causing water reservoir receded so many dead fish.
“The farmers of fish cages now many who become fishermen fishing in the reservoir,” said Ardiansyah.
Around P5.2-million worth of tilapia have been devastated as another fish kill hit anew portions of the critical Lake Sebu in South Cotabato in the last three weeks.
Rudy Muyco, Lake Sebu town’s lake warden, said Wednesday the continuing fish kill has already destroyed a total of 68.291 metric tons (MT) of fingerlings and adult tilapia from fish cages situated in the lake’s eastern and western section.
Citing the prevailing market prices, he valued the damage at P85 per kilo for the adult tilapia and P150 for the hybrid fingerlings.
As of Wednesday, he said the fish kill already affected around five hectares of fish cages and a total of 54 operators.
“The fish kill is still ongoing in some portions of the lake and the situation might get worse in the coming days due to the erratic weather condition,” he told MindaNews on the phone.
Muyco said the latest fish kill, which is the first this year, was caused anew by kamahong, a phenomenon that is mainly caused by the sudden rise in the water’s temperature.
He said several fish cage operators initially reported the problem in some portions of the lake last January 13 after the area’s weather condition suddenly changed due to a low pressure area that affected parts of Mindanao and Visayas.
Kamahong, which usually occurs during the rainy season, triggers the rise of sulfuric acid in the lake’s waters that eventually caused the massive fish kill, provincial fishery coordinator Rex Vargas earlier said.
“It occurs when cold rainwater, which is heavier than warm water, settles at the abyssal zone of the lake. This causes the upturn or upwelling of warm water carrying silts, sediments and gases such as hydrogen sulfide, ammonia, sulphur and methane gas produced by the decomposing organic matter such as fish feeds,” he explained.
Vargas said such situation results in the reduction of dissolved oxygen in the water, “forcing fishes to take in oxygen directly from the atmosphere and eventually die.”
In October last year, around 20 MT of harvestable tilapia and pangasius valued at around P1 million were devastated due to a fish kill that affected some 60 fish cages in the area.
In 2012, around 57 MT of tilapia were destroyed in two fish kills at the lake that were blamed on kamahong.
The initial fish kill in January 2012 ravaged some 48.55 MT of tilapia. It affected 48 fish-cage owners and left a total damage of P3.8 million based on tilapia’s market price of P80 per kilo.
In August that same year, an additional 8,000 kilograms of tilapia, valued at around P650,000, were destroyed in another fish kill that affected 14 fish cages at the lake.
Muyco said the municipal government is presently preparing for the scheduled dismantling starting next week of illegal fish cages along the lake as a strategy to prevent future fish kills.
“The lake is overcrowded. We need to significantly reduce the number of fish cages to its carrying capacity to resolve these problems,” he said.
Muyco said that based on their assessment, Lake Sebu currently hosts a total of 4,800 fish cages or around 1,800 more than its carrying capacity.
The municipal government of Lake Sebu and the provincial government of South Cotabato earlier issued a demolition order for all illegal fish cages at the lake.
Among the fish cages that were targeted for demolition were those that have no permits, sub-leased by their original owners and situated in the lake’s inlets and outlets.
Muyco said the two local governments earlier gave fish cage operators and owners until January 30 to demolish their illegal fish cages but it was extended to February 11.
“Around 65 fish cages have been so far demolished by their owners and this is continuing as we speak. By next week, we expect this number to reach around 1,000,” he added.