[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.spink.cz\/ke-spanku-ulehaji-i-ryby\/#Article","mainEntityOfPage":"https:\/\/www.spink.cz\/ke-spanku-ulehaji-i-ryby\/","headline":"Ke sp\u00e1nku ulehaj\u00ed i ryby","name":"Ke sp\u00e1nku ulehaj\u00ed i ryby","description":"Nejedn\u00e1 se pochopiteln\u011b o sp\u00e1nek ve smyslu zal\u00e9zt do brlohu, tedy v tomto p\u0159\u00edpad\u011b zahrabat se do \u0159\u00ed\u010dn\u00edho p\u00edsku, p\u0159ikr\u00fdt se vrstvou bahenn\u00edho kalu nebo vodn\u00edmi rostlinami, a spokojen\u011b pod\u0159imovat v poloze vle\u017ee na boku. Obyvatel\u00e9 […]","datePublished":"2018-09-19","dateModified":"2018-09-19","author":{"@type":"Person","@id":"https:\/\/www.spink.cz\/author\/#Person","name":"","url":"https:\/\/www.spink.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c4e504508c75b610a351629e223ddd0c5b7858df84b2b7deedc4e007bdf99fc8?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c4e504508c75b610a351629e223ddd0c5b7858df84b2b7deedc4e007bdf99fc8?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"spink.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.spink.cz\/wp-content\/uploads\/img_a325844_w2247_t1537955720.jpg","url":"https:\/\/www.spink.cz\/wp-content\/uploads\/img_a325844_w2247_t1537955720.jpg","height":0,"width":0},"url":"https:\/\/www.spink.cz\/ke-spanku-ulehaji-i-ryby\/","wordCount":500,"articleBody":"Nejedn\u00e1 se pochopiteln\u011b o sp\u00e1nek ve smyslu zal\u00e9zt do brlohu, tedy v tomto p\u0159\u00edpad\u011b zahrabat se do \u0159\u00ed\u010dn\u00edho p\u00edsku, p\u0159ikr\u00fdt se vrstvou bahenn\u00edho kalu nebo vodn\u00edmi rostlinami, a spokojen\u011b pod\u0159imovat v poloze vle\u017ee na boku. Obyvatel\u00e9 vodn\u00ed \u0159\u00ed\u0161e v t\u00e9to \u00fatlumov\u00e9 f\u00e1zi zpomaluj\u00ed d\u00fdch\u00e1n\u00ed, zm\u00edrn\u00ed se pohyby ploutv\u00ed a n\u011bkter\u00e9 druhy ryb se dokonce pokl\u00e1daj\u00ed na dno. Ve sp\u00e1nkov\u00e9 f\u00e1zi je teoreticky snaz\u0161\u00ed rybu ulovit \u2013 uchopit do ruky, ale nen\u00ed to v\u017edy pravidlem. U n\u011bkter\u00fdch ryb doch\u00e1z\u00ed p\u0159i odpo\u010dinku ke zm\u011bn\u011b zabarven\u00ed, v\u011bt\u0161inou se v\u00fdrazn\u00e9 barvy m\u011bn\u00ed na m\u00e9n\u011b syt\u00e9, aby se nestaly snadnou ko\u0159ist\u00ed pred\u00e1tor\u016f. Jin\u00e9 druhy se v t\u00e9to dob\u011b pokr\u00fdvaj\u00ed vrstvou jemn\u00e9ho slizu, a t\u00edm se op\u011bt chr\u00e1n\u00ed p\u0159ed drav\u00fdmi rybami, kter\u00e9 nec\u00edt\u00ed jejich pach. Tento jev je typick\u00fd nap\u0159. pro mo\u0159sk\u00e9 papou\u0161\u010d\u00ed rybky, ploskozubce, jejich\u017e ochrann\u00e1 slizov\u00e1 vrstva je velice siln\u00e1. V\u0161echny ryb\u00ed druhy maj\u00ed pot\u0159ebu sp\u00e1nku Ryby nemaj\u00ed o\u010dn\u00ed v\u00ed\u010dka, kter\u00e1 by mohla zav\u0159\u00edt, sp\u00ed proto s otev\u0159en\u00fdma o\u010dima. Ov\u0161em i v t\u00e9to nejhlub\u0161\u00ed sp\u00e1nkov\u00e9 f\u00e1zi se m\u00edrn\u011b pohybuj\u00ed, obvykle plavou na m\u00edst\u011b. Paryby, kter\u00e9 nejsou vybaveny plynov\u00fdm m\u011bch\u00fd\u0159em, a d\u00fdchaj\u00ed v\u00fdhradn\u011b \u017e\u00e1brami, se i v t\u00e9to sp\u00e1nkov\u00e9 f\u00e1zi pohybuj\u00ed relativn\u011b stejn\u011b jako v bd\u011bl\u00e9m stavu, jsou to v\u0161echny druhy rejnok\u016f a \u017eralok\u016f, pro n\u011b\u017e by del\u0161\u00ed nehybnost znamenala ohro\u017een\u00ed na \u017eivot\u011b. \u010clov\u011bku se ve sp\u00e1nku nejv\u00edce podobaj\u00ed cichlidy, jejich\u017e ploch\u00fd tvar t\u011bla jim umo\u017e\u0148uje polo\u017eit se na bok a spokojen\u011b \u201eusnout\u201c. Jin\u00e9 akvarijn\u00ed rybky m\u016f\u017eete dob\u0159e p\u0159i odpo\u010dinku pozorovat, pokud nech\u00e1te akv\u00e1rium v noci potemn\u011bl\u00e9. Zaj\u00edmav\u011b us\u00ednaj\u00ed ml\u00e1\u010fata tlamovc\u016f, kter\u00e1 se ukr\u00fdvaj\u00ed v tlam\u011b sv\u00fdch dosp\u011bl\u00fdch rodi\u010d\u016f. N\u011bkter\u00e9 us\u00ednaj\u00ed v noci, jin\u00e9 ve dne N\u011bkter\u00e9 ryb\u00ed druhy v\u0161ak maj\u00ed obr\u00e1cen\u00fd biorytmus, jsou to zpravidla ryby drav\u00e9, kter\u00e9 ve dne sp\u00ed a v noci lov\u00ed, podobn\u011b jako nap\u0159. z pta\u010d\u00edch druh\u016f sovy. Do t\u00e9to skupiny pat\u0159\u00ed sumci, \u00faho\u0159i, mn\u00edk jednovous\u00fd , a v\u011bt\u0161ina mo\u0159sk\u00fdch drav\u00fdch ryb. Ryb\u00ed sp\u00e1nek v\u0161ak neprob\u00edh\u00e1 tak jako u \u010dlov\u011bka, v jednom dlouh\u00e9m intervalu, ale v p\u0159eru\u0161ovan\u00fdch cyklech, je to z toho d\u016fvodu, \u017ee i pod vodou je t\u0159eba se m\u00edt na pozoru p\u0159ed dravci. Zv\u00ed\u0159ata to zkr\u00e1tka na t\u00e9to planet\u011b nemaj\u00ed snadn\u00e9, a to jak na pevnin\u011b, tak i pod vodou a ve vzduchu. Na\u0161t\u011bst\u00ed ryby neupadaj\u00ed do hlubok\u00e9ho sp\u00e1nku tak, aby nebyly schopn\u00e9 v\u010das reagovat na bl\u00ed\u017e\u00edc\u00ed se nebezpe\u010d\u00ed a uniknout pred\u00e1tor\u016fm.                                                                                                                                                                                                                                                                                                                                                                                                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