| The round goby and ruffe threaten the Lakes' native perch, small-mouth bass and emerald shiner populations. |
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| The ruffe is a small, spiny, European member of the perch family that does not grow much bigger than 12 cm. |
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| Fight invasive species, like purple loosestrife, zebra mussels, Eurasian ruffe, and spiny water fleas. |
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| The host country were convincing winners with 42.5 points on a canal which provided roach, small skimmers, perch, ruffe and bleak and the occasional sizeable bream. |
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| In Lake Superior, ruffe are also found along the North Shore to Two Harbors, at Taconite Harbor and in Thunder Bay, Ontario. |
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| In 2002, the U. S. Fish and Wildlife Service found the non-native fish species, the ruffe, in Lake Michigan for the first time. |
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| They include the sea lamprey, zebra mussel, purple loosestrife, ruffe, round goby, spiny water flea and dozens of other species. |
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| The recent invasion of zebra and quagga mussels, round gobies, the spiny water flea, white perch and ruffe into Lake Huron heightens the uncertainty for expectations from the ecosystem. |
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| There's the blueback herring, ruffe, tubenosed gobies and, the ever-popular spiny water flea. |
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| As with the gobies, the ruffe originated in the Black and Caspian Seas. |
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| Therefore, having more ruffe in the water leads to less food for other fish. |
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| The ruffe also has an exceptional ability to detect water vibrations through organs called neuromasts. |
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| This trait both aids the ruffe in finding food and gives the ruffe an edge in avoiding predators. |
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| The ruffe has the potential to overtake many other fish species, and consequently damage the Great Lakes ecosystems. |
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| Without concerted intervention, the ruffe have the potential to ruin Lake Superior. |
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| Ever since the ruffe were detected, studies have shown that the ruffe and the yellow perch are closely related and are quickly becoming rivals. |
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| After extensive studies, scientists discovered that the ruffe can be repelled by their own alarm pheromone. |
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| When injured, a ruffe will release this pheromone into the water to warn other ruffe to stay away. |
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| Their catch consisted of 233 specimens of perch, 614 roach, 241 ruffe, and 3 bream. |
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| One of these is the ruffe, resembling a darker miniature version of the perch, which was once common in South Wales but now rarely seen. |
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| Genetic identity, phylogeography, and systematics of ruffe Gymnocephalus in the North American Great Lakes and Eurasia. |
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| It is known that ruffe eat the eggs of vendace, which are particularly vulnerable because of their long incubation period. |
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| The ruffe also has a large, spiny dorsal fin likely distasteful to its predators. |
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| The barrier was designed to keep non-native carp that escaped into the Mississippi River system from moving north into the Great Lakes, and to prevent the invasive ruffe from moving from the lakes into the Mississippi. |
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| The Eurasian ruffe and round goby are aggressive fish invaders whose populations have grown alarmingly in the past 15 years, preying on the eggs and young of other fish or competing with them for food. |
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| The lake of Salagou is also very interesting because of its geology: the basin of the Lake gets its beauty from its unique soil, the ruffe, combination of clay sediments and iron oxide. |
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| The most obvious features to recognize a ruffe are the ruffe's large, continuous dorsal fin and its slightly downturned mouth. |
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| A ruffe usually matures in two to three years, but a ruffe that lives in warmer waters has the ability to reproduce in the first year of life. |
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| The primary spawning season for the ruffe occurs from the middle of April through approximately June. |
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| One week after the hatching, the young ruffe start to swim and feed actively, but they do not form schools at this age. |
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| The introduction of the ruffe seems to be causing much damage to Lake Superior. |
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| The ruffe has similar eating habits, but an accelerated reproduction rate compared to other like fish. |
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| Generally, female and male ruffe do not live longer than 7 to 11 years. |
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| Life for the Eurasian ruffe, starts as an egg, like other fish. |
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| Here is nothing to be seen but a verdingale, yellow ruffe, and periwig. |
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| Growth is usually occurs more when the ruffe is in clear, brackish waters. |
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| The population is threatened by deteriorating water quality and by the ruffe, a fish introduced to the lake in the 1980s and now eating the eggs and fry of gwyniad. |
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| Ever since the ruffe was introduced into the Great Lakes system, scientists and fishery managers have been searching for the right way to get rid of them. |
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| In the beginning, the main method of control was to increase the Walleye and Northern Pike populations, because they are natural predators of the ruffe. |
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| The chemical lampricide TFM kills ruffe, but leaves other fish unharmed. |
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| The ruffe has the capacity to reproduce at an extremely high rate. |
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| The problem will increase if the ruffe invade southern river systems. |
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| Ruffe were first discovered in Loch Lomond, Scotland, in 1982, probably having been introduced as live bait by pike anglers. |
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| Ruffe will leave the deep dark water where they prefer and journey to warmer shallow water for spawning. |
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| Ruffe became the principal food item for the three main fish predators found in the area, the great cormorant, grey heron and northern pike. |
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