Higher temp for Clown Larvae?
- Thread starter jacob30
- Start date
jacob30
Member
Yes I have had heater malfunctions before were the temp hit 90 deg and killed all the larvae. I have also had a heater go to 85 deg and almost all the larvae lived (maybe coincidence). So I have not tried that again until this latest hatch. So far there are just a couple of losses with my most recent hatch kept at 84-85 deg. All the other larvae are eating and doing well. It is still early to say anything for sure. but most of my losses are in the first 3 days and I am at the end of day three tonight.
Granted there are numerous factors involved but I have wanted to try this one again for higher yields.
Granted there are numerous factors involved but I have wanted to try this one again for higher yields.
I think Edgar keeps his at 84. Says they grow faster. I think it may not be as simple as increasing the temp. You have to also insure that oxygen levels stay high enough. And scrupulous cleaning may be required, as metabolism of other organisms such as bacteria may increase too.
Edgar, where are you?
Edgar, where are you?
jacob30
Member
I plan on bringing the temp back down at 7 days to 80 (a few degrees a day) for the reason Kathy mentioned. Yes it would seem to increase their metabolism. Another benefit seems to be that the rotifers are doing quite well at self sustaining in the larvae tank. I just add some IA every day. I have only added rots twice since they hatched.
But of course it could all come crashing down if something nasty starts growing.
But of course it could all come crashing down if something nasty starts growing.
ediaz
Active member
I am sitting on my desk munching on doritos and reading another knee high uses post...
I keep growout at 84, so I can sell the fish sooner.
For larvae, I keep the tank at 82 same as broodstock, but after hatch it could be anywhere from 80 to 84 depending on how crappy the heater is. I aim for 80-82 anyway.
I think the only problem you could have is how accurate your thermometer is and oxygen may become a problem. Rotifer densities in the larvae tank will be more than they need and you might have to remove.
I believe your higher yields are beacuse of experience not temp.
Ed
I keep growout at 84, so I can sell the fish sooner.
For larvae, I keep the tank at 82 same as broodstock, but after hatch it could be anywhere from 80 to 84 depending on how crappy the heater is. I aim for 80-82 anyway.
I think the only problem you could have is how accurate your thermometer is and oxygen may become a problem. Rotifer densities in the larvae tank will be more than they need and you might have to remove.
I believe your higher yields are beacuse of experience not temp.
Ed
David M
New member
High temp/ LOW temp, sooo many opinions 
All I can say is that since I stopped raising the temp ( thank you JH ) I have WAY more survivors. As for "faster growout at higher temps" I am taking 60 fourteen week old oc's to market tomorrow, how fast do you need?? 3-1/2 months is OK by me 
All I can say is that since I stopped raising the temp ( thank you JH ) I have WAY more survivors. As for "faster growout at higher temps" I am taking 60 fourteen week old oc's to market tomorrow, how fast do you need?? 3-1/2 months is OK by me 
JHardman
Premium Member
I am too lazy to search and link my old post, so I will just give a quick summary...
1) I significantly lower the temp of the hatching/rearing tank on first placing a nest in it, e.g. 83.3Ã"šÃ‚°F down to 74Ã"šÃ‚°F to 76Ã"šÃ‚°F.
2) Over the next couple of weeks I am very slowly bringing the temp back up to around 83Ã"šÃ‚°F.
3) Once they are mprph'd and going strong I move to the growout system at 84Ã"šÃ‚°F at which they will stay at until sold.
Bottom line I find MUCH higher survival rates and faster growth rates following this pattern.
1) I significantly lower the temp of the hatching/rearing tank on first placing a nest in it, e.g. 83.3Ã"šÃ‚°F down to 74Ã"šÃ‚°F to 76Ã"šÃ‚°F.
2) Over the next couple of weeks I am very slowly bringing the temp back up to around 83Ã"šÃ‚°F.
3) Once they are mprph'd and going strong I move to the growout system at 84Ã"šÃ‚°F at which they will stay at until sold.
Bottom line I find MUCH higher survival rates and faster growth rates following this pattern.
David M
New member
John, you are not paying California electricity bills I heat the room, not the tanks, so there is little variation in temp excpet that the "system" runs higher because of the pumps mostly. Ever since you advised me I stopped heating the larval tanks (to SDG&E's displeasure I'm sure). The larvae are at 78f but even at that I have much better survival than I did at 84. At three weeks they go into the system which is at 80f for now, will be higher soon I'm sure. Even at 80 I can grow out oc's to 1"+ in 14 weeks so I'm happy with the way it is. There is "ideal" and then then there is "practicle" . I dropped my elect bill by $250/ month when I went with the heated and insulated room as opposed to heating the tanks. Not running the larval tank heaters even lowers that, so not only did you increase my yield but you saved me money too. I owe you bro
I heat the room, not the tanks, so there is little variation in temp excpet that the "system" runs higher because of the pumps mostly. Ever since you advised me I stopped heating the larval tanks (to SDG&E's displeasure I'm sure). The larvae are at 78f but even at that I have much better survival than I did at 84. At three weeks they go into the system which is at 80f for now, will be higher soon I'm sure. Even at 80 I can grow out oc's to 1"+ in 14 weeks so I'm happy with the way it is. There is "ideal" and then then there is "practicle" . I dropped my elect bill by $250/ month when I went with the heated and insulated room as opposed to heating the tanks. Not running the larval tank heaters even lowers that, so not only did you increase my yield but you saved me money too. I owe you bro
JHardman
Premium Member
<a href=showthread.php?s=&postid=7173131#post7173131 target=_blank>Originally posted</a> by David M
John, you are not paying California electricity bills
Kind of make me wish I still lived in Wy where I had super cheap electric bills and a salt water well... then again somethings are more important than water and electrons.
