The pole (fluviatilis bored)
Synonym (S) or Name (S) common (S): Common pole
Maximum size: The intermediate size of the pole ranges between 15 and 25 cm. however, the largest individuals traps measure meadows of 50 cms for weights close to 3 Kgs, the record being a pole of 50 cms for a weight of 3,1 Kgs.
Origin: The pole, originating in Eurasia is currently present on almost the whole of the northern hemisphere.
Zone of life: The pole meets in almost the whole of the watery network. She appreciates calm water as well as the moderate currents with the result that one meets it in pond, lake, rivers and channels.
It is a fish which evolves/moves mainly in bench on the bottom but which does not hesitate to go up on the surface to drive out.
The poles are located generally enough close to banks in the encumbered zones of vegetation one of branches. They also affectionnent the rock funds with the mounting of the least prey.
Temperature: of 5° with 25 °C, the pole is acclimatized very well to all the mediums as long as those Ci are sufficiently oxygenated.
Description: The pole has a body rather high proportionally with the length of the body. Its body is covered with small very hard scales which give him a rough aspect. It is of rather dark color green gray on the back and slightly more clearly on the sides. The belly is white. This body also comprises from 6 to 9 almost black vertical bands.
The fins pelvic and anal are very red and 2 dorsal fins are present, the first on the basis of the head being the only means of defense of the pole vis-a-vis a possible predator because it is made of very hard thorny rays and prickles which it draws up in the event of danger. The caudal fin being relatively small the pole does not move very quickly but the shape of its body makes it nimble and enduring.
The pole has 2 large black eyes located in top of the head what gets an excellent vision to him and its mouth is armed with many small teeth located on the jawbones and the metal disc.
Nutrition: The pole is a carnivore which nourishes primarily worms, shellfish, molluscs and insects but also of small fish (especially in spring and in summer during the period of reproduction of the other species). The pole drives out in group by blocking its preys close to banks. Not being very fast it is frequent that the pole misses Ca prey but it then continues it until exhausting it.
Anatomy: rather high body compared to the length with the presence of 2 dorsals including one provided with hard thorny rays. The head finishes at a peak with a broad mouth full with small raspy teeth.
Behavior: The pole has a gregarious behavior since it moves in benches of more than 200 individuals sometimes. The groups are composed of the same individuals cuts because the pole does not hesitate by showing cannibalism even towards its own species, a pole being able to swallow a fish making half of its size. The large specimens become more solitary.
Dimorphism: No dimorphism noted apart from the period of reproduction. During the abrasion, the colors of the males intensify.
Reproduction: The reproduction of the pole takes place between the end of March and June, the optimal temperature of reproduction being of approximately 12°C. The females can lay until 100000 eggs per kilos of weight which they deposit in the form of ribbons being able to measure up to 3 meters on the vegetation in the herbaria. The eggs of a size of approximately 2mm last one incubation of approximately 15 days to 12°C. (Much longer in colder water). The larvae, after resorption of the vitelline bag, nourish then zooplancton.
The Council for the fisherman: He is frequent to find large benches of poles under the bridges in particular close to the pillars, but also under the boats moored at the edge.
Various: the pole being a very prolific and harmful species with much of species, there is thus no legal size of capture. The flesh of the pole is very fine and very required.
Information: the cards of fish can be to supplement by an experiment of the subject, or a comment concerning a lack of information on this card.