Lepomis marginatus fry question
#1 Guest_mikev_*
Posted 11 July 2014 - 02:58 PM
(I raised a few dozens species of various type and these seem to be the slowest growing I've seen yet.... so a concern if I'm doing something wrong)
Thanks for any help.
#2 Guest_gerald_*
Posted 11 July 2014 - 04:46 PM
#3 Guest_mikev_*
Posted 11 July 2014 - 05:03 PM
Yes, fresh-hatched, I make it daily. I cannot compare with other sunfish, this is the first one for me..... but at best 50% growth after 3 weeks seems abysmal.
(params are 80F, TDS=150, pH=7.1 --- per chance anything wrong with these?)
OK, I'll try to provide more feedings with powder food, maybe this will help.
#4 Guest_centrarchid_*
Posted 11 July 2014 - 10:16 PM
Also consider running two brine shrimp hatches per day, one in AM and one in PM. By 6 hours post-hatch you start seeing declines in brine shrimp nutritional quality.
#5 Guest_mikev_*
Posted 12 July 2014 - 02:51 PM
#6 Guest_gerald_*
Posted 12 July 2014 - 03:01 PM
Eating Artemia cysts could certainly cause growth problems. When I was at NCSU Jeff Hinshaw was experimenting with yellow perch larvae and found that using a dark colored container helped the fish focus on the Artemia and avoid the cysts (better visual contrast) compared with keeping them in light colored conatiners where the cysts were more visible.
#7 Guest_centrarchid_*
Posted 12 July 2014 - 05:13 PM
When it comes to consuming cysts, I think it occurs starting in the second to third weeks which also the beginning of the window where I like to train fry to consume formulated feeds. It appears you can be sloppy with bluegill during the first week with regards to sloppy harvesting of brine shrimp but there after the fish are not so forgiving again until they area month old.
#8 Guest_mikev_*
Posted 14 July 2014 - 09:59 AM
thanks guys.
just one more question: is the fry aggressive to each other? I see smaller fry hiding in the substrate/plants, presumably from larger fry? (all the same age, but not the same size unf.)
#9 Guest_centrarchid_*
Posted 14 July 2014 - 10:38 AM
#10 Guest_Skipjack_*
Posted 14 July 2014 - 01:20 PM
#11 Guest_centrarchid_*
Posted 14 July 2014 - 02:22 PM
We got a real handle on the problem when broods were broken up into batches where each batch was fed from its own brine shrimp harvest setup (treatment). For me, new student workers in the lab where strongly associated with improperly harvested brine shrimp and they could see the impacts first hand of being sloppy.
Harvesting brine shrimp involves more than what a simple reading of procedure indicates.
#12 Guest_Skipjack_*
Posted 14 July 2014 - 02:51 PM
Symptomatically sounds very similar to coccidiosis in ruminants.
#13 Guest_centrarchid_*
Posted 14 July 2014 - 03:20 PM
#14 Guest_mikev_*
Posted 16 July 2014 - 08:58 AM
The real cool differences between sunfishes is with respect to larval and fry behaviors and some of that does involve associations with cover which also has a powerful age / size component for early developmental stages.
Yes, this seems to be the case indeed.... not sure this is a good thing at all, it seems that the growth rate accelerated once a fry ceases to behave like larva (not hiding=>eating much better), but this leads to some fry being 2x the size of others as I see now.
Regarding artemia cysts: they are not getting any. I tested this theory deliberately on rainbows and did not see any ill effects. Of course, it may be different for a different type of fish.
#15 Guest_centrarchid_*
Posted 16 July 2014 - 11:24 AM
Fish do appear to stall growth wise during metamorphosis, at least with respect to length. Depth and width still change a lot as well as all the morphological changes.
#16 Guest_mikev_*
Posted 16 July 2014 - 11:47 AM
and sure you are right about length being stalled now, as other things happen.
Edited by mikev, 16 July 2014 - 11:48 AM.
#17 Guest_mikev_*
Posted 04 August 2014 - 08:26 PM
Growing, still under 0.5" but much deeper bodied, fed with artemia and powdered food... would small bloodworms be safe? if not, what else?
Thanks
#18 Guest_centrarchid_*
Posted 05 August 2014 - 09:28 AM
#19 Guest_mikev_*
Posted 06 August 2014 - 10:30 AM
No intend to stop brine shrimp, only the feeling I should start supplementing. They do take powder (Sera) but again this is too small a food now.
What about things like frozen daphnia?
#20 Guest_centrarchid_*
Posted 06 August 2014 - 11:18 AM
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