11-08-2009, 11:30 PM
| || | bear -- i was thinking it only makes sense that if you can slowly increase the salinity reducing it in a similar way wouldn't have adverse effects either. considering the origins and such of the guppies and how they've been mainstreamed into freshwater aquarium keeping (on those that originate in brackish water) it made me ponder more on the effects of salinity changes myself because we're trying to prompt some of our more 'rare' gups to drop their fry. i've been crossreferencing forums, studies, and books. I came across this study on changes and thought it may answer your question. hope it helps.... Experiments were conducted to determine the adaptability of the guppy to various salt concentrations. The guppy, Poecilia reticulata, (total length 11–40 mm) were subjected to abrupt and gradual changes from fresh water (salinity=0.1%) to various salinities (%). No mortality occurred when the fish were transferred from fresh water to 50% sea water (19.5%). Through gradual adaptation from 50% sea water to 80% of the fish were able to tolerate 100% (39%) sea water for 7 days. After a 7 day stay in sea water, fish were readapted to fresh water during a 3 h period. Through gradual adaptation fish were also able to tolerate salinities ranging from 39.0% (100% sea water) to 58.5%. After a 30 day stay in 150% sea water (58.5%), fish were readapted to fresh water over a 5 h period. The results indicate that they were well able to tolerate the abrupt change from 100 or 150% sea water to fresh water. Females that stayed in 150% sea water (58.5%) for 30 days had embryos in their gonads.
Originally Posted by bearwithfish
Aquriangel....i have read and questioned this in other places and i thank you for your insight..... i do have a question though as it pertains to my own breeding project..... if the fry never have experience with brackish water and then are put into it will that have an adverse effect on the fry? i only ask because as stated i do not use salt but in the future when my little ones are large enough to sell i want to be sure that the LFS or new owner (for privet sales) dont do anything to harm the fish.... i like to think i am a responsible breeder and would like to deal with responsible people as well.... as i am most likely not going to cover cost it certainly is not for the money but more to continue expansion of my tanks and various fish projects...
Romad, thank you very much! glad you like the pics. these are our [new] red albino galaxies We just added tank #7 to the dedicated guppy breeding area. Have quite a colony of varying ages in a 20 gal long grow out. I think fancy gups would look great in a hex, is it tall? they'd be all over the place. We have a 30 or 40 (not positive - second hand) hex with a breeding pair of blue neon angels...had some eggs about two weeks ago, saw a few of the babies made a day or two, then gone. Figure mum & dad ate 'em. But good news they're displaying and cleaning leaves together again.
Originally Posted by Romad
Gorgeous fish Aquariangel. I've been seriously considering restocking my 45 gal hex with fancy guppies when I move my "family" into a bigger tank. I just love the variety of colors and types of guppies out there. Thx for posting those pics. Love them