Trout
[ Salmo trutta ]
Classification
Kingdom:
animalia
Phylum
chordata
Class:
actinopterygii
Order
salmoniformes
Family
salmonidae
Genus
oncorhynchus
3-4
years in
nature
6-8
years in
captivity
Female
1-3 kg
Maximum speed
2,5 m/s
Curiosity
Trout leaping out of the water
When trout feed on insects that live on the water’s surface, they leap 30/40 cm out of the lake to catch prey such as water spiders, midges and mosquitoes.
Description
Anatomy: They have an elongated body, covered with small scales, with a conical head, eyes of a more or less intense golden color and a large mouth. Trout have a tiny dorsal fin (adipose) positioned near the caudal fin. The pectoral fins are positioned under the gills, while the ventral fins appear to be significantly set back towards the anal fin.
Teeth: The dentition is robust and consists of numerous pointed teeth useful for holding prey
Skin: The livery changes according to the environment in which the fish lives. Trout, being fish of rivers and streams, have a very vibrant coloration, greenish brown and olive, with numerous black, purplish, orange, red and golden shades, sometimes orange or yellow highly conspicuous, on the sides.
Habitat /
Habits
Habitat: Trout live in fresh water, preferring cold waters, mountain streams and lakes. Water oxygenation places a high limit on diffusion, as the waters must be abundantly oxygenated.
The water temperature must be very low and never exceed 7-8°C. Above all, the tolerance to water pollution is rather limited.
Reproduction
Species: Polygamous
Sexual maturity: 2 years
Reproductive period: December – January
Gestation: 49 days (7 weeks)
Egg hatching period: 45 days
Number of eggs: 1500 – 2500
Diet
Carnivorous
Trout feed on any invertebrate they can find on the bottom or surface of the lake.
The most frequent prey are larvae of various insects, worms, fish eggs, small fish, crustaceans, mollusks, tadpoles, small frogs and insects.
