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14302

Effect of temperature and feed rate on the body shape of Oreochromis shiranus, a widely-cultured tilapia species in Malawi

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Last updated: 03 Jan 2025

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Abstract

Considering the vitalness of traits such as body shape and size in influencing the marketability of fish, geometric morphometrics was utilized to explore if raising fish at different temperatures and feedrates would affect such important traits. MANOVA revealed significant differences in body shape among fish raised at different temperatures but not those fed at different levels of their body weight. In general, the fish that were raised at 20°C, regardless of the feedrate, had shorter but deeper bodies, larger eyes and longer heads as opposed to the longer and slender bodies, smaller eyes and shorter heads found in those reared at 25°C and 30°C. On size, ANOVA revealed significant differences along temperature and feedrate gradients in a way that fish reared at 20°C were the smallest, followed by those at 25°C and then the largest were those at 30°C. On feedrate, it was only at 30°C where fish fed at 6% body weight were significantly larger in size than those fed at 3% body weight. These findings are discussed in terms of best management practices, especially on how to combine such two abiotic factors in order to maximize growth within the shortest period possible, considering the economical implications.

DOI

10.21608/eajbsz.2012.14302

Keywords

Fry, Mahalanobis Distance, Centroid Size, Canonical Variate Analysis, Poikilotherms

Authors

First Name

Kassam

Last Name

D.

MiddleName

-

Affiliation

Lilongwe University of Agriculture and Natural Resources, Bunda College, Aquaculture and Fisheries Science Department, P.O. Box 219, Lilongwe, Malawi

Email

dadeka@yahoo.com

City

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Orcid

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First Name

Ssebisubi

Last Name

M.

MiddleName

-

Affiliation

Lilongwe University of Agriculture and Natural Resources, Bunda College, Aquaculture and Fisheries Science Department, P.O. Box 219, Lilongwe, Malawi

Email

-

City

-

Orcid

-

First Name

Likongwe

Last Name

S.

MiddleName

J.

Affiliation

Lilongwe University of Agriculture and Natural Resources, Bunda College, Aquaculture and Fisheries Science Department, P.O. Box 219, Lilongwe, Malawi

Email

-

City

-

Orcid

-

Volume

4

Article Issue

1

Related Issue

2604

Issue Date

2012-12-01

Receive Date

2018-09-20

Publish Date

2012-12-01

Page Start

211

Page End

217

Print ISSN

2090-0759

Online ISSN

2090-0821

Link

https://eajbsz.journals.ekb.eg/article_14302.html

Detail API

https://eajbsz.journals.ekb.eg/service?article_code=14302

Order

20

Type

Original Article

Type Code

672

Publication Type

Journal

Publication Title

Egyptian Academic Journal of Biological Sciences, B. Zoology

Publication Link

https://eajbsz.journals.ekb.eg/

MainTitle

Effect of temperature and feed rate on the body shape of Oreochromis shiranus, a widely-cultured tilapia species in Malawi

Details

Type

Article

Created At

22 Jan 2023