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Fish Kill

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Fish kills in Long Island have increased from about five per year to 50 this summer. Photo by Laurie Vetere

Fish kills in waterways around Long Island climbed to over 50 this summer from about five per year in earlier years, driven by increasing water temperatures, algal blooms and increased nitrogen in local waters.

With temperatures climbing more than 2 degrees Celsius over the last two decades, waters around Long Island don’t have as much oxygen, particularly at night when photosynthetic plants are no longer able to catch sunlight and turn it into oxygen.

The fish kills represent a “pretty big number,” said Christopher Gobler, endowed chair of Coastal Ecology and Conservation at the School of Marine and Atmospheric Sciences at Stony Brook University.

Members of Gobler’s lab sample Long Island waters routinely as a part of their research. While his team was out gathering data, Gobler asked them to report any fish kills that included 10 or more fish. The area between Hempstead Harbor and Northport Harbor routinely included observations of fish kills.

Warmer water holds less dissolved oxygen than colder water, because oxygen can escape more easily from water in higher heat.

With temperature as the primary driver, a combination of factors robs the water of oxygen.

“The warmer the water gets, the quicker the bacteria take oxygen out, the faster the fish are respiring” Gobler said. 

He added the fish kills often included menhaden, or bunker, fish. These fish have returned in larger numbers in recent years to the waters around Long Island amid other conservation efforts. More menhaden this summer also brought sharks to the area, as these apex predators hunt bunker fish.

While global warming likely had a significant impact on the number of fish kills, Gobler said, an increase in nitrogen in local waterways also contributed to anoxic conditions and is something residents can control locally.

With more nitrogen, typically from onsite wastewater, algae have more nutrients to grow.

At the same time, when more abundant algae dies, the bacteria that break down the algae consume oxygen.

An additional emerging perspective suggests that the more abundant algae at night are respiring, removing oxygen from the water.

Gobler said people can reduce the release of nitrogen into local waterways, which can also affect groundwater, by upgrading their sewage treatment systems. Suffolk County has created rules, including a Reclaim our Water Septic Improvement Program, which protects the environment by reducing nitrogen emissions.

Gobler remains concerned not only for the fish that wash up in numbers along the shore, but for the marine organisms that aren’t as mobile, such as the invertebrates at the bottom of the waterways.

The fish kills are a flag that “these water bodies are impaired and are not capable of sustaining marine life in a way we’d like them to,” Gobler said.

As for the future, Gobler said it’s difficult to predict how the combination of factors, from global warming to nitrogen runoff, will affect marine life.

“Maybe next year, we go back to five [fish kills] in the summer,” he said. This year was “unlike anything we’ve seen” with a combination of high temperatures and numerous fish kills.

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An expert panel at Stony Brook University discusses environmental issues facing Long Island. Photo by Talia Amorosano

By Talia Amorosano

After a month of increased algal blooms, reduced water quality and two of the most severe fish kills the county has ever experienced, Long Island scientists and officials have decided it is past time — yet about time — to address the issue of harmful nitrogen pollution in our waterways.

Hosted by the New York League of Conservation Voters Education Fund, a forum on water pollution in Suffolk County was held at Stony Brook University’s Charles B. Wang Center on June 23 to identify the core causes of nitrogen pollution and brainstorm functional, cost-effective technological solutions.

In his welcome address, Suffolk County Executive Steve Bellone (D) emphasized the gravity of the problem.

“This problem wasn’t created overnight, and it won’t be solved overnight,” he said. “Big challenges like this won’t be solved in election cycles.”

But he has noticed signs of progress.

“To see this group all coming together, saying we’re going to work to solve this problem, gives me great hope and optimism that we have actually turned the corner and we are now on the road to addressing our water quality issues in a real way.”

At the forefront of the technical and technological sides of this progress are panelists Walter Dawydiak, director of the Suffolk County Department of Health Services; Amanda Ludlow, a scientist at Roux Associates Inc.; Theresa McGovern, a water resources engineer at VHB; and Harold Walker, a professor of Mechanical and Civil Engineering at Stony Brook University.

Dawydiak identified unsewered septic flow as the main source of the nitrogen problem.

“Nitrogen, which we expected to level off, is not leveling off,” he said.

He noted that 85 percent of unsewered septic flow originates in residential areas.

“The elephant in the room is us.”

He said a change in health department standards for residential wastewater treatment — for the first time in 40 years — could mitigate the problem by regulating the installation, operation, and maintenance of septic systems. He referred to this proposed set of regulations as an example of policy driving the technology to where it needs to be.

“We need better technology in this area,” Walker said. “If we’re going to solve this problem, we need to expand the tool box that we have available. … We need to think about systems operating effectively for as long as possible, with little or no maintenance. That’s the challenge.”

Ludlow agreed, and emphasized the importance of implementing systems that treat nitrogen and other pollutants, like pharmaceuticals and hormones, on the 360,000 homes running on old systems: “Focus on technologies that affect all the constituents in our wastewater.”

McGovern said that a holistic yet specific approach to wastewater management would make improvements possible.

“We need to be consistent and science-based with the targets, yet still allow some flexibility,” she said. She suggested setting a universal — instead of concentration-based — limit on the amount of nitrogen allowed to remain in wastewater, while allowing households that consistently perform under that limit increased wastewater flow.

Of course, new technologies and oversight costs money. During the second panel discussion on funding proposals, Suffolk County Planning Commission co-chair David Calone suggested using Hurricane Sandy recovery funds to improve storm-water drainage and prevent sewage from entering waterways.

Dorian Dale, director of sustainability and chief recovery officer for Suffolk County, noted that, though the $16 million of Sandy relief money would cover some of the cost for improvements, it could not provide the minimum $8 billion necessary to replace 360,000 septic systems.

He said changing the tax on drinking water from a base price to one that reflects household usage could help close the gap.

Calone brought up the possibility of reaching out for federal funding and increasing the cap on private activity bonds to spur work on water quality issues.

“Involving the private sector is where we’ve shown a lot of leadership on Long Island,” said Anna Throne-Holst, Southampton Town supervisor. “It has to be a public/private partnership.”

The panelists were optimistic about the county’s ability to undertake the project.

“The last sewer project, 40 years ago, was rife with cesspool corruption,” Dale said. “I don’t think anybody’s going to have time for the shenanigans of the past.”

Throne-Holst expressed her faith that the public will remain informed and engaged on this issue.

“The public education process is well underway,” she said. “People are well aware of what a crisis this is.”

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Pumping nitrogen into our local waters can contribute to fish kills and have other nasty environmental effects. File photo by Rachel Shapiro

There is no need more basic than clean water. We need it in its simplest form to survive, but we also need it to be clean so that it can sustain the animals and plants we eat and support the environments we live in. So why aren’t we trying harder to avoid pumping it with toxins?

Tens of thousands of dead bunker fish have recently washed up on eastern Long Island, killed by low levels of dissolved oxygen in the water. Algal blooms are a cause of those low oxygen levels, and that’s where we come in — the blooms, in turn, can be caused by excess nitrogen in the water. How does that nitrogen get there? It can come from our septic and sewage treatment systems and from the fertilizers we use on our nicely manicured lawns, to name just a few sources.

We may not be able to avoid using the toilet, but we can easily refrain from dumping fertilizers with harmful chemicals into the ground and our water supply. But many of us are operating on obsolete waste systems and our governments should be making it a top priority — in action, not just rhetoric — to move communities over from septic to sewer.

This is undoubtedly a costly process, but it has benefits beyond the immediate. For example, sewer systems enable and encourage development, which is important for all of the downtown areas we are working to revitalize. Revitalized downtowns could help keep young people on Long Island, reversing the brain drain that is the source of such frequent sound bites for our politicians.

Shoring up our water management plans would create a ripple effect throughout so many other important items on our political and social agendas. Without clean water, none of these ambitious improvements will be achieved. We are calling for a heightened awareness from both our neighbors and our public officials not to let our water initiatives run dry.

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Suffolk officials discuss environmental issues facing Long Island after thousands of dead fish washed ashore in Riverhead. Photo by Alex Petroski

The estimated nearly 100,000 dead bunker fish that have washed ashore in Riverhead may seem astounding, but it wasn’t all that surprising to the panel of experts brought before the Suffolk County Health Committee on Thursday.

In late May, the thousands of dead bunker fish, formally known as Atlantic menhaden fish, began appearing in the Peconic Estuary, an area situated between the North and South Forks of Long Island. According to a June 2 press release from the Peconic Estuary Program, the bunker fish died as a result of low dissolved oxygen in the water. This shortage of oxygen is called hypoxia.

Walter Dawydiak, director of the county’s environmental quality division, who serves on the panel, which was organized by the health committee chairman, Legislator William “Doc” Spencer (D-Centerport), testified that the number of dead fish was at or approaching 100,000.

“This one is bigger and worse than any,” Dawydiak said.

According to the PEP, which is part of the National Estuary Program and seeks to conserve the estuary, bunker are filter-feeding fish and an important food source for many predatory fish, including striped bass and blue fish.

Alison Branco, the program’s director, said the fish are likely being chased into shallow waters by predators, but are dying because of low dissolved oxygen levels in the waters. In addition, an algae bloom is contributing to the low levels and is fueled by excess nitrogen loading. Much of that nitrogen comes from septic systems, sewage treatment plants and fertilizer use.

“We’ve reach a point where this kind of hypoxia was run of the mill. We expect it every summer,” Branco, who also served as a panelist, said following the hearing.

While magnitude of the fish kill was astounding, the experts said they weren’t so surprised that it happened.

“I definitely thought it could happen at any time,” Christopher Gobler, a biologist at Stony Brook University, said in a one-on-one interview after the panel hearing. “There’s been an oxygen problem there all along.”

Gobler called it largest fish kill he’d seen in 20 years.

According to panel members, the worst of the fish kill occurred between May 27 and May 30.

Branco did suggest that this shocking environmental event could be turned into a positive if the right measures are taken sooner rather than later.

“It’s always shocking to see a fish kill,” she said. “As much as we don’t want to have things like that happen I think the silver lining is that it did capture the public’s attention.”

Prevention of a fish kill this large is possible, according to Branco. While preventing the harmful algal blooms is not possible, reducing the frequency and severity can be done if the amount of nitrogen in the coastal water supply is controlled.

Adrienne Esposito, executive director of Citizens Campaign for the Environment, an environmental policy advocacy group, agreed that curtailing the amount of nitrogen in the water is the easiest and most impactful way for prevention of a fish kill of this magnitude.

“The journey of a thousand miles starts with the first step,” Esposito said in response to a question about the daunting task of fixing the Island’s sewage treatment techniques and facilities on a limited budget.

Esposito described the roughly $5 million from New York State, which was allotted to Suffolk County to deal with cleaning the coastal water supply, as seed money. Esposito and Branco both said they believe the commitment of time and money required to solve the nitrogen problem in the water supply will be vast.

“We can do this,” she said. “We have to do it. We have no choice.”

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