Tag Archives: Goby Fish

Northern Snakehead Destroy Fish Exports and Ecosystems

Northern Snakehead Destroy Fish Exports and Ecosystems

Wednesday March 9 2011

Sport fishing waiting for the BIG bite

 

“Within the Underwater Ecosystem of Fish and Fisheries of the GLB the commercial and sport fishery on the Great Lakes is collectively valued at more than $4 billion annually. Translating that, means Canada is the 6th largest Exporter of fish and seafood products worldwide.”

“Current concerns include the Fisheries and Oceans Canada warn the Northern Snakehead, native to Eastern Asia, cannot be allowed in Canadian Waters or it will destroy ecosystems and the fish that call it home.”

 

The Great Lakes Basin Ecosystem (GLBE) is unique and fragile ! In the gravel-filled bed an Ancient River System that used to flow south to Waterloo, southeast to Hamilton and southwest to what we now call Lake Ontario. Lake Ontario is the 14th largest lake in the world ! And, the (GLB) is the largest Freshwater Ecosystem in the world ! Yet, being a downstream Great Lake, Lake Ontario is impacted by human activities occurring throughout Lake Superior, Michigan, Huron and Erie basin. Within this freshwater system, the five Great Lakes contain enough liquid to cover the entire U.S. with 7 feet (2 meters ) of water. And, 40 million humans live within the GLB, with 8.5 million Canadians and half of Canada’s industries depending on freshwater. Lake Ontario has the highest ratio of watershed area to surface area. What is the outflow of Lake Ontario ? The outflow to the St. Lawrence River is 93% of Lake Ontario. Inflow comes from a popular fishing ground, the Credit River Watershed, as part of the 14% of inflow from tributaries to Lake Ontario. The Credit River and Lake Ontario are both part of the Great Lakes Basin that connect to the St. Lawrence River and the Atlantic Ocean. The mix of fish species in the Great Lakes -St. Lawrence River came from Mississippi and the Atlantic drainage’s. The GLB and St. Lawrence Region are one of six Arctic-Atlantic sub-zones. Fish from the Wisconsinan Glacier formed the nucleus of present-day assemblage of fish in the Great Lakes basin, says Underhill. The Aquatic Ecosystem Classification for the GLB Wartershed in Ontario that was published by Ministry of Natural Resources in Peterborough, Ontario. In this report, they stated: ” Fish community patterns are the key to biological criteria.” Their methodology included examining distribution patterns of fish families, communities and the observance of some endemic species demonstrates the relationship among the upper level hierarchical organ of ecological units associated with biological processes.

Commercial fishing
Sports fishing in Hamilton

Within the Underwater Ecosystem of Fish and Fisheries of the GLB the commercial and sport fishery on the Great Lakes is collectively valued at more than $4 billion annually. Translating that, means Canada is the 6th largest Exporter of fish and seafood products worldwide. For example, in 2,008 Canada exported move than 600,000 tonnes of fish and seafood = $4 billion. And the Ontario freshwater catch is 12,000 to 20,000 tonnes a year valued at $ 20 million to $ 40 million and employing 1,400 in the fishery industry. The main fish in the Ontario Fishery include: Pickerel (walleye), yellow perch, whitefish, white bass, white perch, lake trout, rainbow smelt and lake herring. The fishery consists of a blend of native and introduced species, some of which are regularly re-stocked. common catches include Lake Trout, Salmon, Pickerel (Walleye) , and Whitefish. The greater commercial fishing harvest were recorded in 1888 and 1889 at about 147 million pounds. Since then, the fishery has been threatened on three fronts: (1) overfishing, (2) pollution, and (3) invasive species. Recent years have seen a major resurgence as Pickerel (walleye) and yellow perch fisheries re-cover in Lake Erie and new Salmon fisheries develop in Lake Ontario. The region’s inland waters offer many fishing opportunities as well. Trout streams attract fly fishermen and the lakes and streams offer a variety of fish including: crappie, bluegills, perch, pike, small and large mouth bass. According to Cudmore and Crossman in 2,000, the Great Lakes was home to 142 established forms of fish, native and introduced. They calculated 26 species considered “threatened” or “endangered” or “special concern”. They say of the 55 species over the years introduced in one or more Great Lakes 25 species became established; and 26 species expired from the Lakes ( 4 of which are globally extinct and 3 were endemic to the Great Lakes). Conversely Hubbs and Lagler in 1981 stated: “234 species live or have lived within the drainage system of the GLB.” In Effects of Socio-Ecological Complexity in Dynamic of Harvested Fish Stocks by Integrative Biology Professor Tom Nudds, University of Guelph said” “there may be fewer fish in the world’s seas today, but Ontario’s Great Lakes fishery remains comparatively healthy/” Helping to conserve fish stocks and sustain commercial freshwater fisheries in Ontario is the purpose of the project at the University of Guelph funded a five year project at $250,000.00 by a national research group – Canadian Capture Fisheries Research Network The Guelph University team of researchers goals include: (1) to apply research strengths in the fish population dynamics, (2) research food web ecology, (c) and, to learn how government agencies and commercial fisheries might better manage fisheries in Canada. Tom Nudds emphasizes that “inland fisheries have largely avoided problems that have led to declining fish stocks, including the collapse of the Atlantic Cod Fishery. As more desirable larger ocean fish are exhausted, fisheries are seeking a smaller less valuable species, a phenomenon called “fishing down the food chain.” Within the concern of fisheries is the fact in Feb. 2,009 U.S.A. President Barack Obama earmarked $475 million for the Great Lake Restoration Initiative. This task force was to work closely with Canada to protect and restore the lakes.

Need to keep our waters safe

 

Current concerns include the Fisheries and Oceans Canada warn the Northern Snakehead, native to Eastern Asia, cannot be allowed in Canadian Waters or it will destroy ecosystems and the fish that call it home. Of the 36 species, the Northern Snakehead are of a particular concern to Canada because it occurs naturally in colder water with its razor sharp teeth and how it bites its prey in half. As a woman found out while fishing in Welland Cannel in Lake Ontario in 2,010 it can live out of water for a few days, as it peruses prey (walks on land). there is evidence it has lived being frozen making it well-suited to Canadian waters. The Boston Globe highlighted overfishing of Bluefin tuna of the Atlantic by the countries bordering the Mediterranean Sea threatening a complete collapse of the stock. Why ? Basically 80% of the catch of Atlantic Bluefin tuna goes to Japan for Sushi ! At a Japanese auction one Bluefish sold for #177.000 U.S.. Brain J. Rothschild, University of Idaho sated in How Bountiful Are Ocean Fisheries : “The world’s farmed fish industry no longer relies on salmon or trout – big reason 2X price for fish meal as of 2,006, and the result of lower catches in Peru associated with El Nino event. China’s growing economy allowed China to buy up one-sixth of the 6 plus million metric tons of fish meat available on the world market each year.” That fact changed everything said Ronald Hardy ,who directs the University of Idaho’s Acquaculture Research Institute, the spice/centre of U.S,. farmed rainbow trout production. The Underwater Ecosystems have been unbalanced by 54% decline of the big predators – tuna, cod, swordfish. But, small prey have doubled. In the American Assoc. for the Advancement of Science in Washington D.C. Christenson, an Ecosystem Modeller say “try more economical fish – sablefish, mackerel, sardines or albacore tuna. The problem with albacore tuna is the concern of high mercury content, and it is also high in selenium !    Selenium is a trace mineral that is essential to good health but required only in small amounts. Selenium is incorporated into proteins to make selenoproteins, which are important antioxidant enzymes. The antioxidant properties of selenoproteins help prevent cellular damage from free radicals. Free radicals are natural by-products of oxygen metabolism that may contribute to the development of chronic diseases such as cancer and heart disease . Other selenoproteins help regulate thyroid function and play a role in the immune system.

Are able to breath air
Northern Snake head
Razor sharp teeth

Source , University of Guelph, Univeristy of Idaho, Fisheries and Oceans Canada,

By Jacqueline

Doug Worrall Photography

 


 


Great Lakes Invasion Goby and Snakehead Fish Hamilton

Great Lakes Invasion Goby and  Snakehead Fish Hamilton

Friday November 25 2010

Veracious feeders

GOBY FISH

Dozens of foreign species could spread across the Great Lakes in coming years despite policies designed to keep them out, causing significant environmental and economic damage, a federal report says.

The National Center for Environmental Assessment issued the warning in a study released this week. It identified 30 nonnative species that pose a medium or high risk of reaching the lakes and 28 others that already have a foothold and could disperse widely.

Among the fish that scientists fear could cause ecological and environmental damage are the monkey goby, the blueback herring and the tench, also known as the “doctor fish.”

The report described some of the region’s busiest ports as strong potential targets for invaders, including in Canada Toronto, Hamilton up to the st. Lawrence seaway and; Superior, Wis.; Chicago and Milwaukee.

Exotic species are one of the biggest ecological threats to the nation’s largest surface freshwater system. At least 185 are known to have a presence in the Great Lakes, although the report says just 13 have done extensive harm to the aquatic environment and the regional economy.

Perhaps the most notorious are the fish-killing sea lamprey and the zebra mussel, which has clogged intake pipes of power plants, industrial facilities and public water systems, forcing them to spend hundreds of millions on cleanup and repairs.

Roughly two-thirds of the new arrivals since 1960 are believed to have hitched a ride to the lakes inside ballast tanks of cargo ships from overseas ports.

For nearly two decades, U.S. and Canadian agencies have required oceangoing freighters to exchange their fresh ballast water with salty ocean water before entering the Great Lakes system. Both nations also recently have ordered them to rinse empty tanks with seawater in hopes of killing organisms lurking in residual pools on the bottom.

Despite such measures, “it is likely that nonindigenous species will continue to arrive in the Great Lakes,” said the report by the national center, which is part of the Environmental Protection Agency.

Some saltwater-tolerant species may survive ballast water exchange and tank flushing, it said. And aquatic invaders could find other pathways to the lakes — perhaps escaping from fish farms or being released from aquariums.

The report does not predict which species might get through. Instead, it urges government resource managers to monitor waters under their jurisdiction in hopes of spotting attacks in time to choke them off.

“Early detection is crucial,” said Vic Serveiss, a scientist with the National Center for Environmental Assessment and the report’s primary writer.Invasive species

Hugh MacIsaac, a University of Windsor biologist and director of the Canadian Aquatic Invasive Species Network, said he expected very few invaders to reach the Great Lakes in ballast water now that both nations are requiring tank flushing at sea. Flushing and ballast water exchange should kill 99 percent of organisms, he said.

“I would be very surprised if their prediction comes true,” he said, referring to the EPA report’s suggestion that numerous invaders could reach the lakes despite the new ballast rules.

The report reinforces the need for further measures to keep foreign species out, including requiring onboard technology to sterilize ballast tanks, said Jennifer Nalbone, invasive species director for the advocacy group Great Lakes United.

“We are only beginning to invest the tremendous amount of resources needed,” Nalbone said. “We’re being hammered by invasive species and are still woefully behind.”

Snakehead Fish

Snakehead and bowfin

Snakehead fish are native to China but are imported into the US as aquarium fish as well as food fish. Snakeheads can cause serious problems to native fish populations if they get established in Canadian and  US waters.

A snakehead was found recently in a river in Welland canal. Incredibly, it was not identified before it was released back into the Lake! It could be an aquarium pet that got too big and was dumped, or it could have been imported for food and somehow been released into the Lake.

Snakeheads look a lot like bowfins. They feed in similar ways and have teeth. If you catch a snakehead, don’t try to lip it! Do kill it, though, do not release it back into the water.

You should never release any kind of fish into waters it was not caught in. Snakeheads are just one example of the kinds of fish that cause problems. Carp are one of the worst of the imports.

Snakeheads are not considered game fish so there are no limits or seasons on them. They should hit live bait or artificials that look like little minnows since that is their major food.

If you catch a strange looking fish, contact your local Game and Fish Department and have them identify it. Help keep your fishing waters clear of snakeheads and other problem fish.

RELATED

Cormorants go where fish are most plentiful, The following picture show a cormorant feeding on Goby Fish, if so the lakes are full of Them. The picture above was a Goby caught with a salmon roe bag while trying for Trout.

cormorant eating goby

Reports that a reviled northern snakehead fish was caught in the Welland Canal are false, meaning the Great Lakes are free of fish that can sever human arms with their jaws.

“The fish caught was a bowfin,” said Kevin Hill, a spokesman for the Department of Fisheries and Oceans. “This species is native to the area.”

An angler initially believed a northern snakehead — a much-feared invasive species that is native to Asia — almost broke her fishing rod then jumped on her this past weekend.

The native bowfin, described by anglers as,  “mean and ugly” can grow to be 109 centimeters in length, have sharp teeth, strong jaws and often ruin artificial lures. Their reputation has made them unpopular with Ontario anglers.

Despite its reputation, the bowfin is a puppy in comparison to the snakehead.

Information WIKIPEDIA

Photography

Doug Worrall Photography

Round Gobies Ecosystem Damage and Sport Fishing

Round Gobies (Neogobius melanostomus (Pallas)  , Ecosystem Damage, and  Sport Fishing

Saturday October 2nd 2010

Goby Fish

On Monday June 29th, 2,010 Ontario Sport-fishing posted a fisherman’s comment.  He said, “ I used  the goby fish head for bait, and ahuge Perch was all over it. Big catfish eat them. And, I got a huge Silver Bass on parts of a goby.” Therefore, it appears that the local fish are used to goby fish, and use them as food fish. Environmental Canada news release of July 23, 1999 stated the round goby fed on 78 zebra mussels a day.  But, as this fisherman said on June 29th,  2,010 the gobies are in turn preyed upon by several sport fish species: brown trout, small-mouth bass, walleye, sturgeon and yellow perch. Gobies are a menace to native fish populations by eating their eggs and offspring.  Gobies are aggressive in competing for food and deny other fish to spawning grounds.  Currently Hamilton Harbour has both salmon and trout heading for spawning grounds.  And, the goby fish will chase a fish twice its size.  Sport fishermen find goby fish not only invasive, but a nuisance as they steal the bait of their fishing lines. Today, October 1st, 2,010 Doug caught a goby fish in Hamilton Harbour and the size of its mouth looks like it is ready to devour anything in sight.

Boat Fisherman and gulls
A most interesting study has just been published in Eco-toxicology and Environmental Safety for Oct. 2,010. Among other researchers, is Dr. Signal Balshine, Dept. Psychology, Neuroscience and Behaviour at McMaster University.  These researchers  investigate the question “Signatures of contamination in invasive round gobies (Neogobins melanostomas): A double strke for ecosystem health ?”  These researchers state “The invasive round goby has a recognized role in transferring contaminants through food webs, but little has been done on the contamnant impact on round gobies themselves.  Their study found (1) Copper and Cadmium, elevated in livers of fish from contaminantes.  (2) Fish were smaller.  (3) Fish had fin loss.  (4) Males had intersex gonads and genitalia.  (5) Ehtoxyresorufin-o-deethylase (EROD) activity was higher inf fish caught near polycyotic aromatic hdrocarbon (PAH) rich sediments.  (6) And, Endrocrine disruption.  The results of this study indicate that contaminants impact the characteristics of round goby populations, which could effect  Ecosystems  beyond toxicant biomagnification. This bomagnification is – the increased concentration of a toxic chemical, at successively higher levels in a food chain.  As a result of biomagnification, organisms at the top of the food chain generally suffer greater harm from a persistent toxin or pollutant than those at lower levels.  These researchers also concluded ” this study also confrms that round gobies can be abundant in polluted habitats, which may draw predators, facilitating mobilization of contaminants in food-webs.”  Knowing about this research, leaves the question  – Are Sport Fish caught in Hamilton Harbour safe to eat?” Doug Worrall Says  “Some people do, and at there own risk, Different cultures actually eat the Carp out of Hamilton Harbour, they are not educated on the high level of Methol  Mercury and other Pollutants in the Great Lakes”.   As evironmentalists and conservationists it is imperative we educate the general public who do sport fish about food web, or, ecostudies,  in food chains.
By Jaqueline D
and
Doug Worrall