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Kogelvis forum • Toon onderwerp - Is een dood dwergkogelvisje gevaarlijk?

Is een dood dwergkogelvisje gevaarlijk?

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Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor lex » 31 jul 2012 09:41

Deze vraag stel ik eigenlijk uit nieuwschierigheid:
Kan een dood dwergkogelvisje gevaarlijk zijn voor een andere vis als hij deze op eet?
Eigenlijk lijkt het me best logisch dat dat wel zo is. Maar mischien bevatten ze te weinig gif om een grotere vis te doden.
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor Lode » 31 jul 2012 09:47

Interesante vraag. Ik denk het zeker wel. Weet alleen niet of het gif "actief" blijft na de dood?
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor lex » 31 jul 2012 10:04

Ik denk dat het gif wel actief blijft naar de dood. Denk maar aan de bereiding van kogelvissen waarbij zeer voorzichtig gewerkt moet worden als het niet meer actief zou zijn zou het ook niet nodig zijn om zo voorzichtig te werken en zou bovendien niemand kunnen sterven aan het eten van kogelvissen die gif bevatten.
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor Juliette » 31 jul 2012 10:27

Ja ik denk wel dat een kogelvisje gevaarlijk is als andere deze opeten.
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor Wes » 31 jul 2012 11:44

interessante vraag lex.
wat ik mij hierbij afvraag is volgende: bevatten de organen van (alle) (dwerg)kogeltjes wel TTX (tetrodotoxine)?
ik meen ergens gelezen te hebben dat niet alle kogelvissen (en dan gaat het over individuele kogelvissen, niet over soorten) giftig zijn omdat de vis niet zelf de TTX zou aanmaken. het zou eerder voorkomen door een bacteriële of parasitaire infectie.
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor Nanda » 31 jul 2012 14:13

Het hangt er vanaf of de kogelvis in het wild of in gevangenschap is geboren. Het gif wordt namelijk veroorzaakt door een symbiotische bacterie die in het voedsel voorkomt van de kogelvis in zijn natuurlijke leefomgeving.

Aangezien en nauwelijks wordt gekweekt met kogelvissen kan je ervan uitgaan dat een dode kogelvis gevaarlijk is voor andere vissen.

Ik weet alleen niet hoe het zit als een andere kogelvis een dode kogelvis opeet. Volgens mij was dit ongevaarlijk maar zeker weten doe ik het niet. :)

Voor meer informatie over TTX: index.php?i=content&mode=artikelen_onderzoek&category=Giftigheid
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor lex » 31 jul 2012 15:08

Duidelijke uitleg Nanda. :2thumbs
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor Juliette » 31 jul 2012 15:16

Maar waarom is dan alleen een kogelvis giftig? Ik neem even aan dat hun voedsel ook door andere roofdieren wordt gegeten.
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor lex » 31 jul 2012 16:37

Je maakt het nu wel weer heel moeilijk Juliette.
Maar vind het wel top om achter dit soort dingen te komen :2thumbs
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Re: Is een dood dwergkogelvisje gevaarlijk?

Berichtdoor Nanda » 31 jul 2012 17:23

Je kunt alles terug vinden in het artikel wat onder de link staat:

"Vele kogelvissen zijn erg giftig door de aanwezigheid van tetrodotoxine, een verlammend gif. De vis ontleent dit gif aan een symbiotische bacterie en accumuleert het in een aantal organen en in de huid. Tegenwoordig zijn er ook gekweekte kogelvissen die meestal vrij zijn van de bacterie en daarom niet giftig. Het gif bevindt zich vooral in de eierstokken en in mindere mate in galblaas, lever en darm."

Het gif accumuleert (slaat zich op) in bepaalde delen van het lichaam. Waarschijnlijk doen andere roofdieren dit niet.

Overigens zijn kogelvissen niet de enige giftige dieren die TTX bevatten. Ook andere vissen, salamanders, padden, octopussen, zeesterren en krabben, zoals in de ruwe salamander, de Boulengers klompvoetkikker Atelopus boulengeri, de grote blauwring-octopus Hapalochlaena lunulata en de kleine blauwring-octopus Hapalochlaena maculata accumuleren TTX. Dit bevindt zich vaak ook in de huid, organen en spekselklieren.

Nog een leuk weetje uit het artikel: vrouwelijke kogelvissen zijn vaak giftiger dan de mannelijke kogelvissen; dit omdat een groot deel van de TTX zich in de ovaria (eierstokken) bevind.

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