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Kogelvis forum • Aanverwante zeewater soorten

Diodon nicthemerus 



Egelvissen (Diodontidae) vormen een grote familie van beenvissen uit de orde van Kogelvisachtigen (Tetraodontiformes) (onderorde: Tetraodontoidae). Een bijzonder geslacht uit deze familie zijn de Diodon. Egelvissen worden soms verward met kogelvissen (of Tetraodontidae). Kogelvissen dragen echter, in tegenstelling tot egelvissen geen stekels op de huid. Egelvissen kunnen bovendien hun stekels (een soort beweegbare stralen) laten bewegen, en hebben een sterke bek waarmee zij hun prooi kunnen vermorzelen. Vissen uit andere geslachten van de familie Diodontidae (zoals Chilomycterus) hebben daarentegen vaste, niet beweegbare stekels.

Egelvissen kunnen net als de kogelvissen hun lichaam opblazen door water of lucht in te slikken, waardoor zij tot een bal opzwellen. Hun sterk toegenomen volume beschermt hen dan tegen aanvallen van roofvissen. De scherpe, naar buiten opklappende stekels, vormen daarbij een tweede beschermingsmechanisme. Sommige soorten zijn giftig, vanwege de stof tetrodotoxine in hun huid/of ingewanden. Door deze eigenschappen hebben egelvissen maar weinig van roofvissen te duchten, behalve misschien van haaien of orka's, hoewel op jonge exemplaren ook door tonijnen en dolfijnen wordt gejaagd.

Bij egelvissen wordt er gezegt dat ze zich in gevangenschap opblazen om aandacht te trekken. Dit in tegenstelling van kogelvissen die dit doen als uiting van stress. Dit is echter niet bewezen.


De Diodon nicthemerus leeft in de Indische oceaan en Stille oceaan (Indo-Pacific).

De Indische Oceaan ligt tussen Oost-Afrika, Zuid-Azië, de archipel van Indonesië en Australië. Ook het verre zuidelijke Antarctica zou als een grens kunnen worden gezien. Het noordelijk deel van de Indische Oceaan wordt door India in tweeën verdeeld, in de Golf van Bengalen en de Arabische Zee.



De Indische Oceaan is, met een oppervlakte van 73.481.000 km², de kleinste oceaan (tenzij de Noordelijke IJszee ook als oceaan wordt gezien). De Indische Oceaan is de derde grootste oceaan van de wereld en bedekt ongeveer 20% van het totale wateroppervlak van de aarde. De gemiddelde diepte is 3.890 meter en de grootste diepte, 8.047 meter.

De Grote Oceaan of Stille Oceaan (Engels: Pacific Ocean, vroeger Stille Zuidzee genoemd) is een oceaan die ligt tussen Oost-Azië, Noord- en Zuid-Amerika en Australië. De oceaan grenst in het noorden aan de Noordelijke IJszee en in het zuiden aan de Zuidelijke Oceaan. De Grote Oceaan is de grootste oceaan op aarde. Hij heeft een oppervlakte van 165,2 miljoen km², oftewel 32% van de aardoppervlakte; inclusief randzeeën bedraagt de watermassa zelfs 35% van het totale aardoppervlak. De Grote Oceaan is ontstaan na het opbreken van Pangea.



De temperatuur van het water in de Stille Oceaan varieert van onder 0 °C in de poolgebieden tot ongeveer 29 °C dichtbij de evenaar. Het zoutgehalte varieert ook wat de breedtegraad betreft. Het water dichtbij de evenaar is minder zout dan het water elders, vanwege overvloedige equatoriale neerslag. Bij de polen is het zoutgehalte ook laag, doordat daar weinig verdamping van het zeewater plaatsvindt.







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