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Beta Bal???

Beta Bal???
Açıklama:	Beta Bal??? ulunmu? olan en eski bal?k fosilleri 500 milyon ya??ndad?r. Günümüzün bal?klar? k?k?rdakl? bal?klar (Chondrichthyes) ve kemikli bal?klar (Osteichthyes) olarak ikiye ayr?l?rlar. Bunlar gibi di?er iki grubu olu?turmu? olan Placodermi (Z?rhl? bal?klar) ve Acanthodii (dikenli köpek bal?klar?)'n?n nesilleri 300-400 milyon y?l evvel tamamen tükenmi?tir Bir kulakc?k ve kar?nc?ktan meydana gelen yüreklerinde daima kirli kan bulunur. Yürekten ç?kan kirli kan solungaçlarda temizlendi?inden, vücutta temiz kan dola??r. A??zdan al?nan su, solungaçlardan d??ar? at?l?rken suda çözülmü? oksijen, osmozla kana verilir. Bu arada suda bulunan besinler ise yutulur. köpek bal?klar?nda su hem a??zdan hem de ilk solungaç yar???ndan al?n?r. Tuzlu su bal?klar? su içtikleri halde, tatl? su bal?klar? su içmezler. Gerekli su ihtiyaçlar?n? solungaç zarlar?ndan osmozla al?rlar. Deniz bal?klar? içtikleri suyun tuzunu böbrekle de?il, solungaçlar? ile ay?r?r. Bal?klarda gö?üs ve kar?n yüzgeçleri çift, s?rt, kuyruk ve anal yüzgeçleri tektir. Tek yüzgeçler nadiren birden fazla olsalar da simetrik çiftler meydana getirmezler. Uçan bal?klar çok geli?mi? olan gö?üs yüzgeçlerini açarak bir-iki dakika su üstünde uçabilirler. Ya?ad??? yerlerde su kurudu?u zaman balç??a gömülüp akci?er solunumu yapabilen, sürünerek gölden göle geçebilen, k?sa bir süre havada uçabilen, elektrik ve ???k üretebilen çe?itli bal?k türleri mevcuttur. Bal?klar?n pullar? birbirleri üzerine kiremit gibi dizilmi?, kemiksi, kaygan ve antiseptiktir. Antiseptik mukus salg?s?, üzerine yap??an bakteri ve sporlar? yok eder. Bal?klar?n harekette önemli rol oynayan de?i?ik kuyruk tipleri mevcuttur. Çatallanm?? kuyruk tipine “difiserk”, çatall? olup e?it parçal? olana “homoserk”, köpek bal?klar?nda oldu?u gibi çatallar? e? olmayan kuyruk tipine de “heteroserk” denir. Bal?klar omurgal? canl?lar içerisinde say?ca en fazla olan?d?r. Çal??malarda bal?k türünün 40.000 kadar oldu?u söylenmektedir. Bal?klar?n günümüzde sportif ve akvaryumdaki de?eri yan?nda büyük bir protein kayna?? olmas? ticari de?erini artt?rmaktad?r. Bal?klar?n yeryüzündeki da??l?mlar? o kadar geni?tir ki, Antartika sular?nda, s?cak tropikal sularda, ac? sularda, tatl? sularda, ?????n ula?t??? da? derelerinde veya insanlar?n henüz ula?amad??? oldukça derin ve karanl?k sularda ya?ayabilmektedir. Üç türlü beslenme görülür: Herbivor (otçul), karnivor (etçil) ve omnivor (hem et hem de bitkisel besin yiyenler). Yaln?z çenelerinde de?il, bütün a??z bo?luklar?nda ve yutaklar?nda s?ralan?? ve ?ekil olarak birbirinden farkl? birçok di? bulunur. Bu genelde beslenme ?ekillerine göredir. Baz?lar?nda farinks (yutak) di?leri geli?mi?tir. Yaln?z Mersin bal?klar?nda ve Demetsolungaçl?larda di? bulunmaz. Kaynak wikipedia
Anahtar Kelimeler:	Beta, Bal?klar, Bal?k, Resimleri
Tarih:	22.06.2008 19:00
Hitler:	2484
İndirmeler:	27
İzlenme:	4.43 (7 Oylar)
Dosya Boyutu:	57.9 KB
Gönderen:	Resimlerindir

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30.01.2012 05:15

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