# how to decrease population?

**URL:** <https://community.alliancegenome.org/t/how-to-decrease-population/4262>\
**Category:** Scientific Discussion\
**Created:** [April 26, 2012, 8:31am UTC](https://community.alliancegenome.org/t/how-to-decrease-population/4262 "2012-04-26T08:31:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![martka](https://community.alliancegenome.org/letter_avatar_proxy/v4/letter/m/b487fb/32.png) [@martka](https://community.alliancegenome.org/u/martka)\
**Post date:** [April 26, 2012, 8:31am UTC](https://community.alliancegenome.org/t/how-to-decrease-population/4262/1 "2012-04-26T08:31:33Z")

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Hi everyone,  
like in a topic, I’m looking for conditions that causes decrease in population. I use N2 and AB1 strains in normal condition (petri plates with NGM & OP50, at 20 degree). I do not want to change the breeding condition but maybe give them something to reduce e.g. velocity of reproduction.  
I will be very thankful for any reply:)  
Thanks  
Marta

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**Author:** ![Janet\_Duerr](https://community.alliancegenome.org/letter_avatar_proxy/v4/letter/j/5fc32e/32.png) [@Janet\_Duerr](https://community.alliancegenome.org/u/Janet_Duerr)\
**Post date:** [April 26, 2012, 3:10pm UTC](https://community.alliancegenome.org/t/how-to-decrease-population/4262/2 "2012-04-26T15:10:18Z")

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Marta,

You can slow things down a bit by growing the worms in a 12-13C incubator. Most strains are fine at this low temperature, but I would check any mutants to be sure they are okay.

Janet