‘Nigeen Lake has turned eutrophic’

SKUAST Tests Confirm Physico-Chemical Variations Caused Fish Mortality


Srinagar, Aug 10: Setting all speculations about death of thousands of fish in Nigeen Lake to rest, the Fisheries and Limnological experts of Sher-e-Kashmir University of Agricultural Sciences (SKUAST) Kashmir have said high mortality was mainly caused due to change in the physico-chemical parameters of Nigeen waters propelled by high pollution levels.
Experts from SKUAST have been conducting various tests in the Nigeen since Sunday when the death of large number of fish came to fore. In their preliminarily studies, the experts have detected low dissolved oxygen levels in Nigeen due to eutrophication.
“After comprehensive scientific tests we have found that Nigeen Lake is almost euthrophic. It has high concentration of organic matter. At some places the dissolved oxygen level has dropped from normal to 1.8 milligrams per litre which proved fatal for some species of fish like Crossocheilus Diplochilus and Gambusia Assinis,” Dr Feroz Ahmad Shah, a scientist of Aquatic Animal Health at SKUAST, told Greater Kashmir.
However, he said the native fish Schizothorax was not affected by the process as it prefers to move around springs and cleaner parts of the lake.
Dr Feroz said that two years ago death of fish in large numbers was witnessed in Wullar Lake. “Same species of fish were affected there too. He said Crossocheilus Diplochilus and Gambusia Assinis are mainly found in those parts of a water body which, like Nigeen Lake, have high concentration of mosquitoes as they feed on their larva.
“We have gathered samples of the morbid fish and will conduct histopathological examination of vital parts including liver, kidney and gills for traces of toxification due to metals and other toxic elements present in the water body,” he added.
Dr Adnan Abubakar, a limnologist, and Dr Irfan Khan, a fish genetist, both from SKUAST are part of the studies on fish death in Nigeen.
“The orthophosphate level in the lake is 2.9 milligrams per litre, much higher that permissible one microgram. This signifies that Nigeen has turned eutrophic. The decomposition of organic matter caused hypoxic condition in the water system leading to increase in ammonical nitrogen which is highly toxic for fish. The influx of sewage from Lal Bazar and adjoining areas contributes to pollution level in the lake,” Dr Abubakar said.
He said the summer deweeding can be another cause of depletion in dissolved oxygen because the aquatic plants produce oxygen in the process of photosynthesis.
Dean Fisheries SKUAST, Dr Masud Balki, maintains that ‘summer kill,’ in which a large number of fish die due to increase in temperature, signifies that the water body has become eutrophic.
“Root cause of high mortality of fish in Nigeen Lake cannot be only due to high temperature. Oxygen depletion coupled with high pollution levels cause heavy influx of macrophytes, algae which suck oxygen during night,” Dr Balki said.
Dr Balki said on Sunday when the fish died the weather was cloudy and hence no photosynthesis occurred in Nigeen Lake causing acute deficiency of dissolved oxygen and subsequent death of fish.
He underscored the need for comprehensive studies for long-term conservation of fish and other aquatic species. “In the backdrop of high fish mortality in Nigeen we have started studies and its report will be released in coming weeks,” he added.
For past four days, different theories have been floated about the cause of fish deaths. While the LAWDA maintains that the fish died due to high temperature, the Fisheries Department claims that low oxygen levels triggered by decomposition of obnoxious weeds led to high mortality of fish.
The High Court, monitoring the conservation of Dal and Nigeen lakes, Tuesday directed the Government to constitute a committee of experts comprising experts from SKUAST, University of Kashmir and Fisheries Department to ascertain cause of fish mortality in Nigeen.

Lastupdate on : Fri, 10 Aug 2012 21:30:00 Makkah time
Lastupdate on : Fri, 10 Aug 2012 18:30:00 GMT
Lastupdate on : Sat, 11 Aug 2012 00:00:00 IST

  • del.icio.us
  • StumbleUpon
  • Digg
  • TwitThis
  • Mixx
  • Technorati
  • Facebook
  • NewsVine
  • Reddit
  • Google
  • LinkedIn
  • YahooMyWeb
  • Print News

Enter the Security code exactly as you see it in the image security code is CaSe SeNsItIvE(Cookies must be enabled)

  • Kashmir

‘Enemies trying to divide Kashmiris in the name of Maslaks’

Yasin Malik Addresses Public Gathering At Tral, Gets Warm Reception  Srinagar, Aug 10: The chairman of Jammu Kashmir Liberation Front Muhammad Yasin Malik Friday said that “the enemies of freedom More

  • Srinagar City

Mirwaiz stuck in traffic jam outside Jamia Masjid

Admin caught napping in chaos on Shaher-e-Khaas roads


Srinagar, Aug 10: State government’s alleged callousness towards Shaher-e-Khaas yet again came to fore this afternoon when thousands made it to Jamia Masjid Nowhatta for congregational Friday prayers but More

  • Jammu

JK experiencing 22% rainfall deficit



Jammu, Aug 10: Jammu and Kashmir is experiencing around 22 percent deficiency in rainfall in the current monsoon season, the first indication of a drought like situation in the state. While the monsoon More

  • South Asia

Attique for NAM countries role to settle Kashmir


Islamabad, Aug 10: The former prime minister of PaK and the president of Muslim Conference Sardar Attique Ahmed Khan has urged the member countries of the Non-Aligned Movement (NAM) to come forward in More

  • World

OIC summit in Makkah

Syria,Myanmar,Palestine Under Spotlight

Jeddah, Aug 10: The tragic situation in Syria, and the crisis in Myanmar caused by the persecution of the Muslim Rohingya people of the Arakan region will figure prominently in the extraordinary Islamic More

  • Education and Career

KU launches PG diploma in disaster management

Srinagar, Aug 10 : Kashmir University’s Department of Geography and Regional Development is launching a job oriented and multidisciplinary course titled ‘Post Graduate Diploma in Disaster Management’ ( More

Designed Developed and Maintaned By Imobisoft Ltd /Algosol Software Solutions