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The Cormorant

Well first of all say that these birds are called Colmoranes Cormorants and not as commonly called some people. The word "cormorant" is but a corruption of the Latin name of the species: "Corvus marinus", ie, sea raven, the name by which time designated in these birds . Gender Phalacrocorax is the largest genus in species of cormorants family Phalacrocoracidae, ie, there are great variety of seabirds and not all behave the same way. As an example I list a few for the reader to get an idea of \u200b\u200bthe variety that exists:

• Phalacrocorax fuscicollis
• Phalacrocorax capensis
• Phalacrocorax magellanicus black-necked Cormorant
• Phalacrocorax nigrogularis
• Phalacrocorax neglectus
• Phalacrocorax capillatus
• Phalacrocorax aristotelis
  Cormorán moñudo
• Phalacrocorax africanus
• Phalacrocorax lucidus
• Phalacrocorax coronatus
• Phalacrocorax niger
• Phalacrocorax pygmaeus
• Phalacrocorax featherstoni
• Phalacrocorax varius
• Phalacrocorax carunculatus
• Phalacrocorax fuscescens

also as a very important, saying that some species of extinct birds, such as Phalacrocorax perspicillatus

cormorants feed on fish capturing underwater. Are promoted, particularly with their feet and can dive for more than a minute, reaching a depth of approximately 10 meters . Unlike most aquatic birds, their feathers are not completely waterproof, so when wet weight increases bird allowed to sink faster and dive with ease. Once on the ground, spread their wings to dry. In addition, regulate the volume of air sacs. Lives in lakes and estuaries well as the costs , and builds its nest in cliffs or trees . Has a size of 90 cm long, and can be found in freshwater and coastal areas worldwide. a bird is stationary or, at most, irregular migration takes place, because only changes of residence

driven by the abundance of food they can find during the winter.

E n Far East, and particularly in China and Japan, cormorants used for fishing, placing them at the base of the neck with a ring, which prevents birds swallow the prey capture. Once the cormorant has filled the belly, the fisherman pulls the strap that ties him to the boat forced him to regurgitate the fish and throws it back into the water. At dawn, as this type of fishing is usually done at night, the fisherman removes the ring that surrounds the neck of the cormorant, gives some fish and put the ring again, this time above the crop. Failure to take this precaution, the regurgitaría bird food, as is wont to do.

Cormorants cause grave damage to the fish fauna of lakes and ponds, as their greed is

incredible.


OPINION

The idea of \u200b\u200bthis blog does not accurately describe each species, which can be found in any scholarly book as has been publicados.Lo article said that I think most important is that this species can cause very serious damage to the fish fauna of lakes and reservoirs.

This sentence is a very common dilemma among fishermen of the Iberian Peninsula. In some León areas (preserves trout) have been authentic fishermen killing of these birds to avoid, they say, that those birds are causing serious damage to the existing trout population in the area.
The dilemma I pose me is how to convince or to know where these birds should be fed to cause the least harm in the population of fish in the rivers? Why have you come to areas where cormorants has never been? Make bird killings solve the problem, or is the wrong measure?
Studies very contradictory and often go through all things. Angel Serdio is under the command of an investigation into the damage that can actually cause these birds in aquatic ecosystems of the peninsula. There are no conclusive data on this research, but it seems that depends on the environment. I mean, in shallow rivers (such as the upper Órbigo in) these birds hunt fish very easily, since they are accustomed to fish in the sea where the ability to escape from the barrier is much higher and the visibility of smaller dams, among other things by the waves, so in these waters and due to the insatiable appetite of the bird if it can be harmful for the environment.
The solution to prevent cormorant fishing in these waters is complicated, we again have a range of possibilities, where many factors come into play. For example, in certain areas of fish farms are installed cannons that scare off the birds, but the information works for a short time at the end the birds learn that it is noise and there is no danger, therefore continue to fish. Another option is to put fish farms adopted by networks covering the piles with trout this is the most effective. Clearly this is a very good measure for such facilities but what we do in the rivers?
kill The truth is that I think is a truly savage, but I see many more possibilities, if any of you know any strategies they have applied in other countries and the results have been good, please comment.
As for the appearance of these birds in new areas according to experts, is due to climate change, the birds have found new areas where they spend the winter with a large food source readily available. But I have not found a scientific study which demonstrates this fact.


Thank you all and I welcome your comments.