SPINARELLO
(Gasterosteus aculeatus)
Classification Class bony Fish, Gasterosteiformi
order, Gasterosteidi family
Dimensions Along 8 cm
Geographic distribution
Europe, Asia and
North America
The spinarello diffused in Italy and it lives in
all the regions fuorch in Lombardy, Piemonte and in Sicily. Its name
must to the fact to possess sturdy spiny beams on the back and the
ventre that in order not pungono as you arm with defense: on the
back, in particular, also they are erected them; the tail has
triangular profile.
The coloration of spinarello the much variable
one, for the greater part dellanno of a green color marroncino with
silver abdomen much camouflage one, but allepoca of the reproduction
the males becomes green blue on the back and red fire on the ventre.
Of this species migratory populations exist but
also sedentarie, like the benches that pass linverno on the coasts
of the North Sea and to spring they move going back the rivers, where choose the
zones for the deposition of eggs.
The
behavior of this fish be a lot studied from numerous etologi for
interesting its complessit: at the moment of the courtship the male
constructs to a species of nest tunnel on the bottom that he
upholsters with aquatic vegetation, held with from one collosa
substance, produced from kidneys and deposited with repeated
passages of the fish on the nest; he then defends just the nest with
fury against whichever possible one avails again.
Endured
after that a female places eggs in the place prepared (approximately
a hundred), the male emits the sperm for to fertilize them and
subsequently removes also the female. But the eggs do not remain
continuously abandoned perch the male that if of it it takes cure,
still making circular lacqua in the nest by means of the movement of
the fins chest straps, cosi to guarantee a sufficient oxygen
contribution. After approximately a ten of days eggs schiudono and
the small are born
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