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Aquatic Invasive Species

Fishing Regulations Icon Connecticut Fishing

 

Help stop the spread!

A number of aquatic invasive species are established in Connecticut and more are threatening to invade. The Angler’s Guide again focuses on the zebra mussel, as it continues to expand its distribution in Connecticut since 2010.

ZEBRA MUSSEL

Zebra mussels are now found in a number of locations scattered throughout the Housatonic River and its impoundments. Until late 2010 when adult zebra mussels (Dreissena polymorpha) were found in Lake Zoar and Lake Lillinonah, zebra mussels had been found (1998) in CT only in East Twin Lake and West Twin Lake (Salisbury). Since 2010, adult mussels have also been found in Lake Housatonic and free-floating juveniles (veligers) have been sampled at several sites in the river in Connecticut from the Massachusetts line downstream to Lake Lillinonah. Surveys completed in late 2012 confirm the continuing presence of zebra mussels adults and free-floating juveniles (veligers) in the Housatonic River and its three major impoundments in Connecticut.

One possible source of these mussels is downstream migration from Laurel Lake in Lee/Lenox, Massachusetts. Its short outlet stream drains directly into the Housatonic River. In 2009, an abundant population of zebra mussels was documented in Laurel Lake. Adult mussels were also found that year in the Housatonic River in Massachusetts downstream of the confluence with Laurel Lake’s outlet stream. Since then additional populations have been found at sites in the river in Massachusetts, and more recently, and Connecticut.

The non-native zebra mussel was first found in North America in Lake St. Clair (Michigan/Ontario) in 1988. Since then they have spread throughout the Great Lakes, the Mississippi River system and most of New York State including Lake Champlain and the Hudson River, and then into a number of western and southwestern states.

Zebra mussels have fairly specific water chemistry requirements and are limited to waters with moderate to high calcium concentrations and pH. In Connecticut, suitable habitat for zebra mussels is mostly limited to a number of water bodies in western portions of the state. Under highly favorable conditions, this invasive mussel can disrupt aquatic ecosystems and is notorious for clogging water intakes and fouling boat hulls and engine cooling water systems.

Zebra mussels and other aquatic invasive species can be inadvertently spread by boats, gear and bait buckets. Easy “Clean, Drain & Dry” methods to help prevent their spread can be found on the next page.

Zebra Mussels in Connecticut

Their known distribution (as of January, 2013) and the susceptibility of additional Connecticut water bodies to colonization by zebra mussels. Note that since 2013 zebra mussels have widened their distribution in the Housatonic River between Massachusetts and Lake Lillinonah, with “thousands” found at Bulls Bridge and some at the Rocky River power facility in New Milford. The Rocky River facility is the connection between Candlewood Lake and the Housatonic River.

In 2011 and 2012, Biodrawversity LLC. conducted zebra mussel surveys in northwest Connecticut, including the upper Housatonic River, to determine the presence or absence of zebra mussels. Selected physical, chemical, and biological attributes of the surveyed water bodies were also documented and combined with existing data to develop a risk assessment for those water bodies. Additionally, a risk assessment was developed that included other water bodies in the state for which relevant water chemistry data were available. Above is a map showing the susceptibility of these water bodies (plus some close by NY waters) to colonization by zebra mussels. All areas assessed as being at being at medium to high risk of colonization by zebra mussels are located in western Connecticut. (Figure adapted from Biodrawversity LLC. report).

The full report prepared for DEEP by Biodrawversity LLC can be found online at www.ct.gov/deep/fishing.
Some of the Invasives Found in Connecticut

Many boaters and anglers are familiar with freshwater invasive plants, in Connecticut these include:

Eurasian water milfoil was first found in Connecticut in 1979 and has been documented in a number of locations in Connecticut as well as the Connecticut River.

Variable Leaf Milfoil was first discovered in Connecticut in 1936 and can now be found in a number of locations throughout Connecticut.

Hydrilla was first discovered in 1989 and can now be found in a few locations scattered throughout the state. Very aggressive and can outcompete native and invasive species. See page 24 for more information on hydrilla in Connecticut.

Fanwort was first observed in Connecticut in 1937 and is now widely distributed throughout the state.

Water chestnut was first discovered in Connecticut in 1999 and can be found in a number of locations throughout the state including scattered sites along the Connecticut River, several tributaries and connected. Water chestnut appears to be expanding its distribution in Connecticut. Annual plant that spreads via sharp, spiny fruits.

New arrivals to Connecticut include:

(2011) DIDYMO is a freshwater alga that under suitable conditions can form extensive blooms. Prefers cold, low-nutrient streams. In Connecticut, didymo has been found in the upper West Branch Farmington River.

(2012) Chinese mitten crab A juvenile Chinese mitten crab was collected from the Mianus River in Greenwich. This is the first confirmed report of this invasive in CT. This crab reproduces in saltwater but spends most of its life in freshwater.

More information on these and other invasive species in Connecticut can be found online at: www.ct.gov/deep/invasivespecies.

Please prevent new introductions of invasive plants and animals; CLEAN, DRAIN, DRY your boat and gear.

You Can Help!

CLEAN, DRAIN, DRY. You can help prevent the spread of problem species by following these simple suggestions.

Before leaving a boat launch

  • CLEAN—Inspect your boat, trailer and equipment. Remove and discard all aquatic plants and animals, mud and debris you may have picked up while on the water.
  • DRAIN—Completely drain all water from the boat, including bilge water, livewells and engine cooling systems.

At home

  • DRY—Dry anything that came in contact with the water (boats, trailers, trailering vehicle) for at least one week.

or

  • WASH—Rinse boat, trailer and equipment with hot water (high pressure if possible). A bleach solution can be used to clean livewells. Dispose of all rinse materials properly!

Remember

  • Do not dump your bait bucket or release live bait! Avoid introducing unwanted plants and animals. Unless your bait was obtained on site, dispose of it in a suitable trash container.
  • Do not transport fish, other animals or plants between water bodies. Release caught fish, other animals and plants only into the waters from which they came.

IT’S THE LAW! (CGS 15-180, CGS 22a-381d)

  • Boaters must inspect their vessel for vegetation and listed invasive invertebrates (zebra mussel, quagga mussel, Chinese mitten crab, New Zealand mud snail, Asian clam, rusty crayfish) and properly remove and dispose of any vegetation or invasives before transporting the vessel. You can be fined $95 per violation.
  • The importation, transportation, sale, purchase, possession, cultivation or distribution of a number of invasive plants including the following aquatic plants is prohibited:
    • Curly leaved pondweed, Fanwort, Eurasian water-milfoil, Variable water milfoil, Water chestnut, Egeria, Hydrilla, Common reed, Purple loosestrife, Pond water-starwort, Parrotfeather, Brittle water-nymph, American water lotus, Yellow floating heart, Giant salvinia, Yellow iris, Watercress, Onerow yellowcress. Violators can be fined $50 per plant!

WEBsites of interest

These websites can provide a good start to learning more about Aquatic nuisance species.

Be a responsible angler

Protecting both the resource and your access to the resource requires more than simply knowing and following the fishing regulations!

Respect Private Property

  • Do not cast onto docks or into permitted swim areas (when in doubt, cast elsewhere).
  • Ask permission before fishing from shore, or wading on private property.

Don’t Litter, Don’t Pollute

  • Keep your boat and motor properly maintained.
  • Retrieve all lures and gear.
  • Don’t release live bait.
  • Leave your fishing area cleaner than you found it!

Be A Safe Boater

  • Obey boating regulations, and check your safety gear frequently!

Be A Good Neighbor

  • Treat fellow anglers, other recreational users and property owners with courtesy.
  • Always be willing to share both the resource and your knowledge.

And always use common sense and be courteous!

INVASIVE SPECIES ALERT — COVENTRY LAKE & CONNECTICUT RIVER

In 2016, DEEP funded management efforts (including a series of surveys and a herbicide treatment) with the goal of eradication hydrilla in Coventry Lake. It is expected that this management (surveys, possible herbicide treatments) will be ongoing for several more years.

Unfortunately, also in 2016, hydrilla was found in the Connecticut River. First in a difficult to access portion of Keeney Cove in June, and then in September DEEP staff observed several patches of hydrilla mixed in among the aquatic plants growing in the mainstem river at Glastonbury’s Riverfront Park and Boathouse. Based on the observed current growth, it appears that hydrilla has been in the river for a couple of years and it is likely to be dispersed downstream of Hartford. As a result, eradication is likely not practical.

All resource users should take extra care to check and clean their boats (including canoes, kayaks and rowing sculls), trailers, and fishing equipment before leaving the boat launch, or leaving the lakeshore.

Información disponible en español relacionada con la pesca en Connecticut — www.ct.gov/deep/care

Los folletos de la pesca en aguas dulces y aguas saladas fuerón traducidos al español para la distribución a la comunidad hispana residente en Connecticut. El objetivo de los folletos de pesca en español es para ayudar a fomentar, aumentar, y promover la participación hispana en esta actividad.

Somos afortunados en Connecticut por el gran abastecimiento de peces . La población de Connecticut tiene la oportunidad a pescar a no más de 5 millas de su residencia. Las aguas dulces de Connecticut le ofrece pescar peces tales como la Trucha, la Lobina, el Lucio Norteamericano, y el Panfish. Si su preferancia es pez de agua salada, las aguas de Connecticut le ofrece pesca peces tales como la Lobina Rayada, Summer Flounder, Anjona, y Porgy. ¡Vamonos a Pescar!

Fishways and Fishing

Fishing is prohibited in the area immediately downstream or upstream of a fishway, generally for a distance of 250 feet from the fishway. Note that at some fishways, this distance may vary from 250 feet.

At locations where the distance from the fishway does differ from 250 feet, the boundaries of the “no-fishing” area will be as posted by DEEP (look for signs and/or large rocks painted red marking the boundaries).

Anglers with questions about the “no-fishing” zones around any of the over 60 fishways in the state should contact DEEP’s Diadromous Fisheries Restoration Program (Fisheries Division) at 860-434-6043.

DO YOUR PART FOR WETLAND CONSERVATION — BUY A CONNECTICUT Migratory Bird Conservation STAMP!

The Connecticut Migratory Bird Conservation Stamp Program provides the sole source of funding for many of the wetland projects that are conducted in the state. These projects benefit the approximately 274 fish, birds, mammals, amphibians, and reptiles of the state that rely upon clean, healthy wetlands. All waterfowl hunters are required to purchase a Migratory Bird Conservation Stamp, but those interested in wetland conservation also buy stamps. Stamps may be purchased for $17.00 wherever hunting and fishing licenses are sold and at www.ct.gov/deep/sportsmenlicensing.