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Effect of initial weight and stocking density on growth performance of mono sex nile tilapia reared in semi intensive system

Article

Last updated: 22 Jan 2023

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Fisheries

Abstract

The present investigation was carried out at Wady El Raian, Fayoum Governorate, Egypt in order to test the effects of initial weight and stocking density on growth performance and pond productivity of Nile tilapia (Oreochromis niloticus) in semi intensive system. The experiment was carried out in 12 earthen ponds each of a total area of one feddan (4200 m2) to represent six treatment groups in replicates each. The first; second and third two ponds (T1; T2 and T3) were stocked with Nile tilapia fingerlings of an average initial weight of 9.6 g and stocking density 30; 40 and 50 thousands respectively. The second; fourth and sixth tow ponds (T4; T5 and T6) were stocked with Nile tilapia fries of 0.3g and stocking density 30; 40 and 50 thousands respectively. The fish were fed three times daily on a commercial diet containing 27% protein at a rate of 3% of fish biomass. The experiment lasted for 26 weeks from the
start. Results obtained are summarized in the following:
1- Water quality (physical and chemical) lied within the permissible levels
required for optimum growth and development of Nile tilapia.
2- The highest final weight was obtained by T4; T1; T2; followed in a
significant decreasing order by T5; T4 and T6 respectively.
3- Averages of gain in weight; daily gain; specific growth rate and condition
factor were influenced significantly with tilapia initial weight and stocking
density.
4- Total fish production/feddan was the highest for 50 thousand
fingerlings/feddan, stocking density followed by 40 and 30 thousand
fingerlings/feddan.
5- The highest net returns were by the 30 thousand fingerlings/feddan stocking
density (T1) and 40 thousand fingerlings/feddan stocking density (T2) due to the
high contribution of super size and grade 1 fish in the harvest, compared to other
densities and initial weights.

DOI

10.21608/ejabf.2009.2033

Keywords

Nile tilapia, initial stocking size, stocking density, earthen ponds, monoculture, semi-intensive, Growing period, Growth performance

Authors

First Name

Ayman

Last Name

Ammar

MiddleName

-

Affiliation

Department of Aquaculture, Central Laboratory for Aquaculture Research at Abbassa, Sharkia Governorate, Egypt.

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Orcid

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Volume

13

Article Issue

2

Related Issue

424

Issue Date

2009-04-01

Receive Date

2017-04-03

Publish Date

2009-04-01

Page Start

69

Page End

80

Print ISSN

1110-6131

Online ISSN

2536-9814

Link

https://ejabf.journals.ekb.eg/article_2033.html

Detail API

https://ejabf.journals.ekb.eg/service?article_code=2033

Order

5

Type

Original Article

Type Code

103

Publication Type

Journal

Publication Title

Egyptian Journal of Aquatic Biology and Fisheries

Publication Link

https://ejabf.journals.ekb.eg/

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Details

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Article

Created At

22 Jan 2023