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Abstract - Issue Jul 2016, 37 (4) Back
nstantaneous and historical temperature effects on a-pinene
Comparative
growth and survival of diploid and triploid Mozambique tilapia (Oreochromis
mossambicus) reared in indoor tanks
O.F
Nwachi1,2 and Yuzine B. Esa1*
1Department of
Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM
Serdang, Selangor, Malaysia
2Department of
Fisheries, Faculty of Agriculture, Delta State University, P.M.B 1. Asaba
Campus, Nigeria
*Corresponding
Author E-mail: yuzine@upm.edu.my
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Publication
Data
Paper received:
22 May 2015
Revised received:
18 October 2015
Accepted:
09 April 2016
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Abstract
In
the present study, the effect of cold shock on fertilized eggs of Oreochromis
mossambicus was during triploid production. Two males (150 ? 224 g) and
six gravid females (150 g to 264 g) were collected. The females were injected
with ovulin at a dosage rate of 0.5ml kg-1, the eggs were stripped
into a dry bowl, fertilised with milt, divided into two groups (A and B) and
incubated. After three minutes, group A was cold shocked at 50C for a period
for 5 min, while group B was incubated normally. Tilapia larvae hatchlings
were triplicated and stocked at a density of 200 larvae / liter in the
aquaria for four weeks. Results showed that triploid fish had a lower hatchability
(58%) and survival rate (47%) than diploid fish (of 85 and 70%,
respectively), but a higher specific growth rate of 1.097 as compared to
diploid at 0.931. While the improved growth rates have great commercial
applications. Further research should be conducted to improve the lower
hatchability and survivability of triploid tilapia. ?
Key
words
Growth,
Oreochromis mossambicus, Survival, Triploidy, Temperature shock
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