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» CURSOS
CURS ALETEIG I FLOTABILITAT
Domines la teva flotabilitat? Sabries fer una parada de seguretat a 3 metres de fondària al blau, sense agafar-te a cap corda ni res? Sabries aletejar cap enrere? Et preocupa que puguis estar fent mal a organismes marins sense adonar-te? Com s'aleteja sense aixecar un núvol de sediment darrere teu? I el llast? Portes suficients ploms? Potser en portes masses?
Totes aquestes preguntes són a les que amb aquest curs volem donar resposta. És un curs dirigit a totes les titulacions que tinguin interès a millorar la seva flotabilitat a l'aigua i aprendre tècniques d'aleteig més respectuoses amb el medi.
DATES:
Teoria: divendres 16 de maig 19.15h a 20.45 h a la Facultat de Biologia.
Pràctica: dissabte 17 i diumenge 18 de maig, de 10 a 14h al Centre de Tecnificació Multiesportiu d'Esplugues (Av. Països Catalans, 40-48, Esplugues de Llobregat 08950).
PREU: 40 €
Per fer aquest curs és imprescindible ser soci/a del CIB i tenir, com a mínim, el nivell B1E o el Open Water Diver.
INSCRIPCIONS: Us podeu apuntar en el formulari. Teniu temps per apuntar-vos fins dilluns 5 de maig a les 16.00h , les places són limitades i es donaran per ordre d'inscripció.
Composed of a central disc, rounded to pentagonal, with five arms coming out of it. Their length is about 5 times the diameter of the disc, which in adult specimens achives a size around 20mm. The ambulacral feet are barely developed. The disc is covered with short tiny spines, arranged in 5 radial groups. Normally the colour is brown or grey, but sometimes it varies from purple to red, yellowish, orange or even white.
Where does it live?
They are found from northern Europe to South Africa. Also at the Mediterranean Sea.
How do they feed?
They feed on particulate matter which they collect with the help of the ambulacral system, located at the ventral part of the arms. The ambulacral system carries the food to the mouth.
How do they reproduce?
Generally Ophiuroidea need two years to become sexually mature. There are males and females. Their eggs are found in bags, where the larvae develop.
Is a confusion possible?
Their can be a confusion with Ophiothrix luetkeni, but this species just presents small dorsal spines. It also can be mixed with Ophiocomina nigra.
Curiosities
· They can live up to ten years
· Their arms are fragile and brake easily. They use them to escape from possible predators by leaving them behind and afterwards they are able to regenerate them back to normal size. That's why we can observe many animals with half-sized arms
· If you take a specimen from the ground and let it fall back, it falls with the arms open. If you do the same with the species Ophiocomina nigra, this falls with their arms folded up
