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Growth and nutritional trials on transgenic Nile tilapia containing an exogenous fish growth hormone gene

Growth and nutritional trials on transgenic Nile tilapia containing an exogenous fish growth hormone gene
Growth and nutritional trials on transgenic Nile tilapia containing an exogenous fish growth hormone gene
In a long-term growth trial, transgenic tilapia Oreochromis niloticus L. showed a 2·5-fold increase in growth compared with non-transgenic siblings. At 7 months, mean mass of transgenic tilapia was 653 g compared with 260 g for non-transgenic siblings. A significant increase (P<0·01) in head : total length ratio, viscera-somatic index and hepato-somatic index was observed in transgenic fish. Female gonado-somatic index (IG) was found to be lower in transgenics than non-transgenic siblings in both mixed and separate culture conditions. Transgenic male IG values were found to be higher in mixed culture and lower in separate culture than that of their non-transgenic siblings. Food conversion efficiency was more than 20% greater in the transgenic fish. In a second shorter-term growth performance trial, the transgenic fish grew to about four times the size of their non-transgenic siblings. A digestibility trial suggested that transgenic tilapia were more efficient utilizers of protein, dry matter and energy. Apparent digestibility of protein and apparent energy digestibility were higher in the transgenic fish.
food conversion, protein digestibility, morphology, liver, gonado-somatic index
0022-1112
62-78
Rahman, M.A.
77447cf8-c98d-478f-8d43-74bfc928cd11
Ronyai, A.
60e7ffc0-bdb8-426f-a423-61aeeb3d1e5f
Engidaw, B.Z.
dd4a9c06-1106-4dc3-acc6-dff03e675134
Jauncey, K.
483a3e50-4961-45b4-9330-c40a60547c8e
Hwang, G.L.
f7551a47-ebc7-4afa-9dfa-66645aa2654f
Smith, A.
f115f8cb-6c76-444b-ba80-7a1d54276da8
Roderick, E.
5a692662-21d4-4f86-9e9e-80b41faa2b8c
Penman, D.
33307f30-fb9f-4dcd-9a36-7870fa9ec337
Varadi, L.
b488d655-340f-4711-8963-46a2993d6e19
Maclean, N.
fc7272ea-27ce-4f19-bb5b-dbccb8c520a8
Rahman, M.A.
77447cf8-c98d-478f-8d43-74bfc928cd11
Ronyai, A.
60e7ffc0-bdb8-426f-a423-61aeeb3d1e5f
Engidaw, B.Z.
dd4a9c06-1106-4dc3-acc6-dff03e675134
Jauncey, K.
483a3e50-4961-45b4-9330-c40a60547c8e
Hwang, G.L.
f7551a47-ebc7-4afa-9dfa-66645aa2654f
Smith, A.
f115f8cb-6c76-444b-ba80-7a1d54276da8
Roderick, E.
5a692662-21d4-4f86-9e9e-80b41faa2b8c
Penman, D.
33307f30-fb9f-4dcd-9a36-7870fa9ec337
Varadi, L.
b488d655-340f-4711-8963-46a2993d6e19
Maclean, N.
fc7272ea-27ce-4f19-bb5b-dbccb8c520a8

Rahman, M.A., Ronyai, A., Engidaw, B.Z., Jauncey, K., Hwang, G.L., Smith, A., Roderick, E., Penman, D., Varadi, L. and Maclean, N. (2001) Growth and nutritional trials on transgenic Nile tilapia containing an exogenous fish growth hormone gene. Journal of Fish Biology, 59 (1), 62-78. (doi:10.1006/jfbi.2001.1622).

Record type: Article

Abstract

In a long-term growth trial, transgenic tilapia Oreochromis niloticus L. showed a 2·5-fold increase in growth compared with non-transgenic siblings. At 7 months, mean mass of transgenic tilapia was 653 g compared with 260 g for non-transgenic siblings. A significant increase (P<0·01) in head : total length ratio, viscera-somatic index and hepato-somatic index was observed in transgenic fish. Female gonado-somatic index (IG) was found to be lower in transgenics than non-transgenic siblings in both mixed and separate culture conditions. Transgenic male IG values were found to be higher in mixed culture and lower in separate culture than that of their non-transgenic siblings. Food conversion efficiency was more than 20% greater in the transgenic fish. In a second shorter-term growth performance trial, the transgenic fish grew to about four times the size of their non-transgenic siblings. A digestibility trial suggested that transgenic tilapia were more efficient utilizers of protein, dry matter and energy. Apparent digestibility of protein and apparent energy digestibility were higher in the transgenic fish.

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More information

Submitted date: 8 August 2000
Published date: July 2001
Keywords: food conversion, protein digestibility, morphology, liver, gonado-somatic index

Identifiers

Local EPrints ID: 55817
URI: http://eprints.soton.ac.uk/id/eprint/55817
ISSN: 0022-1112
PURE UUID: 04a0fb71-f271-4b48-8799-aaf319f791ef

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Date deposited: 06 Aug 2008
Last modified: 15 Mar 2024 10:57

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Contributors

Author: M.A. Rahman
Author: A. Ronyai
Author: B.Z. Engidaw
Author: K. Jauncey
Author: G.L. Hwang
Author: A. Smith
Author: E. Roderick
Author: D. Penman
Author: L. Varadi
Author: N. Maclean

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