7145 ‎(2)‎

• UCREFRP Catalog Number: 7145
• Author: Inslee, T. D.
• Title: Spawning of Razorback Suckers
• USFW Year: 1981.
• Copyright Material: NO

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All treatments above 1:300 regardless of length of time treated showed
growth of the mycelia and reproduction of the fungi. The positive controls
showed growth and reproduction in alI tests. The negative controls showed
no growth.
After 16 days there was no growth or reproduction of the 1:75 or 1:100
formalin treatment. Only minimal growth was observed in one of three 1:200
formlin for 15 minutes and only one of three 1:200 formlin for 10 minutes
showed growth and reproduction.
This study shows that viable eggs can be treated with a formlin solution
as strong as 1:75 for ten minutes and not harm eggs. The fungi can be killed
or retarded with 1:200 formlin for 10 minutes. The treatment recommended
is a constant flow treatment in 1:100 for ZO minutes on the second and
early on the fourth day after hatching.
Maintainence of Adults in Pond
The adtuls in the two C ponds received five pounds of catfish rations
on work days. The fish ate the rations readily and when moved to.a holding
pond were in good body condition. The rate of feeding will be increased as
temperatures increase to the rate of 2 to 2.5% of body weight.
Starting Fry on a Prepared Ration
The fry fed in the 4' x 1' x 1' tank were first observed fcedi.ng t1~e
third day after the fry were swimming continously. A considerable loss
occured during the first week but most were abnormal fry. This lot of fry
had been far hatched and although actual counts of abnormal fry were not
made, the poor survival rate is atributed to fry quality. The fish were
stocked in a rearing pond after 17 days on feed. A survival rate of 60.6%
was achieved in this test.
Samples showed that all fish had food in their digestive tracts at
stocking.
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