The Lake’s Fish Species
Italian Native Sturgeon (Acipenser naccarii)
This fish may measure up to 2 metres in length, may live about 80 years and weigh up to 80 Kg.
Let’s recall that the female of this species reaches sexual maturity at around 14-15 years of age and that reproduction may take place only once every 2-3-4 o 5 years.
Better known as “The ’American” since it originated in North America, this species can reach 100 years of age, five metres in length and a weight of 300 Kg or more. The female is lager than the male. A fish of two and a half metres may be 40 years old and may weigh up to a quintal.
Originally this trout species populated the Pacific coast of the entire North American continent, today, thanks to its physical characteristics and contained costs, it is disseminated also in small sport fishing lakes.
In comparison to torrent trout it seems able to feed on a wider number of foods.
The size of this sort of specimen normally range from about 30-35 cm up to a maximum of 50 cm.
This is not a subspecies but only a trout whose pinkish flesh colour reminds us of that of salmon. The colour depends on a diet rich in carotenoids that are often administered to trout on fish farms to obtain the pink flesh colour.
Thus, this species has the same characteristics of the trout.
It may be found in the running waters of many Italian regions; in the northern part of the country there are some hybrid species like the “Po Valley Trout”. It may range from 30-35 cm to up to a maximum of 50 cm in highly productive environments and may weigh between 4 e 5 Kg.
This fish’s morphology is very similar to that of trout.
Its size may vary greatly from one environment to another: in normal environments it may reach 20-30 cm, in environments that particularly favour growth even 40-50 cm and exceptionally, in deeper lakes, it may reach 80 cm and weigh up to 10 Kg.
Cyprinus carpio, also commonly known as mirror carp originated in Persia, Asia Minor and China. In Italy the species was introduced 2000 years ago by the ancient Romans both as a food source and also because the species adapted easily; in fact today, it may almost be considered autochthonus. It reproduces in spring and summer and its length may vary from 30 to 60 centimetres with a weight usually between 3 and 35 kilos. This fish is very longevous and it is estimated that it may live up to 100 years.
Very peaceful, it lives in large groups (even up to 10 specimen). It is omnivorous and feeds both on animal organisms such as insects and worms and on vegetable substances.
Tench are stocky bodied, covered in small scales with large fleshy fins. Their backs are greenish in colouring while the belly area is a lighter, yellowish colour. Fins are greenish-brown. Eyes are red.
Usually they reach 30-50 cm in length and 4 kg in weight, although 84 cm long tench have also been reported (not in Italy).
Sexual maturity is at 4 years for males and two for females.
This omnivorous fish feeds on benthic and vegetable organisms, especially at night.
Male eels can reach a length of 50 cm, while females can measure up to 150 cm and weigh up to 6 Kg.
In freshwater the eel becomes a nocturnal animal, living hidden in burrows or on the lake bottom during the day.
Depending on type of nutrition, there are two ecologic forms of eels: a "pointed head eel " that feeds on insects, larvae, crustaceans and worms and a “wide headed eel” that is a predator and feeds on fish.