<P> Males differ from females by having the second antennae markedly enlarged , and modified into clasping organs used in mating . Adult female brine shrimp ovulate approximately every 140 hours . In favourable conditions , the female brine shrimp can produce eggs that almost immediately hatch . While in extreme conditions , such as low oxygen level or salinity above 150 ‰ , female brine shrimp produce eggs with a chorion coating which has a brown colour . These eggs , also known as cysts , are metabolically inactive and can remain in total stasis for two years while in dry oxygen - free conditions , even at temperatures below freezing . This characteristic is called cryptobiosis , meaning `` hidden life '' . While in cryptobiosis , brine shrimp eggs can survive temperatures of liquid air ( − 190 ° C or − 310 ° F ) and a small percentage can survive above boiling temperature ( 105 ° C or 221 ° F ) for up to two hours . Once placed in briny ( salt ) water , the eggs hatch within a few hours . The nauplius larvae are less than 0.4 mm in length when they first hatch . Brine shrimp have a biological life cycle of one year . </P>
<P> Males differ from females by having the second antennae markedly enlarged , and modified into clasping organs used in mating . Adult female brine shrimp ovulate approximately every 140 hours . In favourable conditions , the female brine shrimp can produce eggs that almost immediately hatch . While in extreme conditions , such as low oxygen level or salinity above 150 ‰ , female brine shrimp produce eggs with a chorion coating which has a brown colour . These eggs , also known as cysts , are metabolically inactive and can remain in total stasis for two years while in dry oxygen - free conditions , even at temperatures below freezing . This characteristic is called cryptobiosis , meaning `` hidden life '' . While in cryptobiosis , brine shrimp eggs can survive temperatures of liquid air ( − 190 ° C or − 310 ° F ) and a small percentage can survive above boiling temperature ( 105 ° C or 221 ° F ) for up to two hours . Once placed in briny ( salt ) water , the eggs hatch within a few hours . The nauplius larvae are less than 0.4 mm in length when they first hatch . Brine shrimp have a biological life cycle of one year . </P>
when do brine shrimp produce eggs versus live birth
when do brine shrimp produce eggs versus live birth
every 140 hours
every 140 hours