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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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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

 

 

 

Publication Data

Paper received:

22 May 2015

 

Revised received:

18 October 2015

 

Accepted:

09 April 2016

 

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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