drop SG in larval tank or keep the same as breeding tank

[mbbuna]

i see conflicting stories on whether to drop the SG or keep it at the breeding tank SG. how is everyone doing it?

J. Wilkersons book says to drop it to (i think) 1.018 with in 3 days, but i see so many people say they do there daily water changes with water from the breeding tank. our breeding tank is connected to our reef system and the SG is 1.026

 

[Ron Popeil]

ill use water from the broodstock tank the night of the hatch (1.026), then drip water the next day to lower the salinity to 1.020. ive done this because it was recommended as well by joyce. however, now that you mention it, its about time i see what happens with a more natural salinity....ill try it on my next nest hatch in 7 days.

 

[heap]

i drip fresh water to get the salinity down to 1.019/1.020 over the first two days as well...and i use broodstock tank water for water changes during the first week. i just dilute it down to 1.020 or so before putting it in the larval tank.

 

[heap]

btw, i'd thought of doing the same just to see what would happen, Ron...i was just too lazy to bump the rots salinity up to where dumping them in full strength saltwater wouldn't fry their little pseudo-brains.

 

[OrionN]

Does she give a reason for her recommendation of lower the salinity to 1.020?

 

[Ron Popeil]

two reasons if i remember correctly:

1) rotifers reproduce better in salinities of 1.015, and go into shock with a .004 change of salinity. so keeping the fry water close to the rotifer salinity, prevents rotifer shock

2) she claims she has lower fry mortality with lower salinities, and she doesnt exactly know why.

i think thats why she prefers the lower salinity. please correct me if im wrong.

 

[MarinaP]

<a href=showthread.php?s=&postid=10011829#post10011829 target=_blank>Originally posted</a> by OrionN
Does she give a reason for her recommendation of lower the salinity to 1.020?

$$ - when you are dealing with mass production

Rots will be fine at 24.