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Kogelvis forum • Toon onderwerp - Brakwater, meten is weten !

Brakwater, meten is weten !

Waterkwaliteit voor kogelvissen

Brakwater, meten is weten !

Berichtdoor swa » 01 aug 2008 22:50

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Re: Brakwater, meten is weten !

Berichtdoor Lode » 01 aug 2008 23:09

Heel interessant Swa. Ik heb er weer een hoop van opgestoken, bedankt :left thumb
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Re: Brakwater, meten is weten !

Berichtdoor swa » 01 aug 2008 23:34

Geleidbaarheid en kweken?

Geleidend vermogen als zodanig zegt natuurlijk niets over de geschiktheid van het water. Men moet deze in relatie met de GH, KH, SH en pH beoordelen. KH 1 °DH is ongeveer gelijk aan 30 µS 0,5 mg kookzout geeft een geleidbaarheid van 10 µS. Theoretisch mag gedistilleerd water geen geleidend vermogen hebben. In de praktijk wordt echter tussen de 0,2 en 4 µS gevonden. Aangezien de verschillende zouten in overeenkomstige concentraties een gelijk geleidend vermogen veroorzaken, kan men met de algemene opgave van het geleidende vermogen, nauwkeurig beschouwd, niets beginnen.

- met één uitzondering: als we weten bij welke µS-waarden bepaalde vissen afzetten, zouden we voor dat doel, bijvoorbeeld uit gedistilleerd en osmosewater, zeezout en mineralen, het juiste afzetwater voor ze kunnen bereiden.

(Nakweek Brachygobius xanthozona, 2007)
In nauwe samenhang met de hoeveelheid opgeloste mineralen in het water, gemeten door middel van de geleidbaarheid, staat de osmotische druk, die verantwoordelijk is voor het opzwellen en krimpen van eieren, spermatozoïden. Indien we niet direct zwellingsprocessen willen provoceren, dienen we ervoor te zorgen dat de osmotische druk in eieren en spermatozoïden ongeveer met dat van het aquariumwater overeenstemt.

Is de osmotische druk in de cellen hoger dan dat van het water, dan treden smeltingsprocessen op. In het extreme geval springen de cellen, beschimmelen en dienen Coleps-soorten en andere infusoriën als een welkome voedingsbodem. Is de osmotische druk in het water hoger dan in de cellen, dan krimpen die.

Het gevolg in beide gevallen is hetzelfde: afsterven van de eieren en de spermatozoïden, zodat het verwachte kweekresultaat noodgedwongen uitblijft.
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Re: Brakwater, meten is weten !

Berichtdoor Lode » 02 aug 2008 06:35

Goh, ook dat wist ik niet. Om te kweken met brakwater kogelvissen zouden we dus eigenlijk de waarde van geleidbaarheid moeten weten, welke het paren triggert?

De vraag is alleen hoe kom je hier achter...
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Re: Brakwater, meten is weten !

Berichtdoor swa » 03 aug 2008 19:34

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