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Brown bullheadIctalurus nebulosus Brown bullhead spends their days lurking amidst rocks while waiting for twilight to fall, at which point they go looking for food. As prey they seek insects, worms and crustaceans, which they locate using their barbels and extraordinary sense of hearing. Brown bullhead, have four barbels on both their upper and lower jaws. They have yellowish-brown scaleless skin with an adipose fin on their backs. They were introduced in the 1920s, which makes them relatively new inhabitants of Finnish waters. Nowadays they reside in the lakes and streams of South Finland, as well as coastal bays. They can weigh up to one kilogram and grow to 40 centimeters in length.  
Crucian carpCarassius carassius The crucian carp is a tenacious fish which prospers even in wintry, low oxygen water conditions, as it is able to produce oxygen by using the sugar reserves of its liver. This process also creates alcohol but has had no adverse effect on anglers! Crucian carp are often the only fish in ponds where other fish have departed. Coppery in hue and up to 40 centimetres long, it is a close relative of the gold fish common in aquariums. There are also lake and pond forms of the crucian carp, but they are actually the same species. Its size depends on the amount of nutrition it is able to attain; it is usually able to obtain the greatest amount of food in large lakes. Apart from lakes and ponds, it also inhabits the southern coastal waters of Finland. 
IdeLeuciscus idus Large and sturdy, the ide likes to swim in mixed schools among its relatives, the roach. What set the ide apart from roach, among other things, are its yellow eyes and small scales. Adult ide usually have a greenish or coppery hue on their back and flanks. A hereditary deviation of the species is known as the "golden ide", it is popular among hobby gardeners. The ide’s diet consists of bivalve and gastropods. Ide resides all along Finnish coastal and inland waters, except for the northernmost parts of Lapland or small lakes. Since it can grow reach a maximum length of 50 centimetres it is a good food fish. 
Lake troutSalmo trutta m. lacustris The lake trout is a highly treasured fish of Finland’s inner waters. It is part of the salmon family and similar to the brook and sea trout. In fact, distinguishing the lake trout from the two is often challenging, due to a lack of clear identifying characteristics. The sea trout inhabits the waters of Saimaa, Paijanne and particularly Finland’s northern lakes, such as Lake Inari. The lake trout has a unique behavioural trait that sets it apart from the lake salmon; it swims both upstream and downstream to spawn. Large lake trout can weigh over 15 kilograms and be over a meter long. Lake trout consume insects and other fish. 
PerchPerca fluviatilis Perch are the most common fish in Finland: one can find them in almost all lake and coastal areas. Perch live to a maximum age of 30 years and may grow up to 50 centimetres long, at a weight of about three kilograms. Their diet consists of worms, insect larvae and small fish. Occasionally, they prey on fish almost as large as themselves - such as eel pout. Perch spend their early mornings and evenings swimming in large schools hunting for food and their nights laying alone on bottoms or resting among aquatic plants. 
RuffeGymnocephalus cernuus The slime covered, mottled brown ruffe is common along Finnish shorelines and inland waters, except for the northernmost part of Lapland. It likes staying at bottoms, at depths of two to 30 meters. At dusk, it searches for food in large schools at bottoms. Its diet consists of mosquito larvae, gastropods and isopods. When threatened, it spreads its spiky fins and gill covers, which usually make its predator, leave and seek an easier meal. Ruffe grows to about 15 centimeters in inland waters and slightly more in coastal areas. 
TenchTinca tinca On lakes or marine bays, on sunny summer days in southern Finland, one may see a school of dark sturdy tench swimming close to the surface enjoying the warmth. Despite this habit, tench are bottom dwellers, which prosper in eutrophic, muddy water bottoms. They seek food in the shelter of the dark and favour water plants, worms and gastropods. When surprised they quickly slip into muddy bottoms or hide amidst vegetation. Half a meter long and at best over two kilograms in weight, they are considered food fish, although their appreciation varies depending on region. |
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