Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.)
The effect of salinity (0, 10 & 20‰, water temperature 28 ± 1°C) and food ration (3 and 4.5% bw/day) on food consumption and growth of Nile tilapia, Oreochromis niloticus (10.77 ± 0.21g) were investigated. Individual food consumption was measured using X-radiography technique. Salinities (0, 10 & 20‰) did not have significant effect on the growth rate of groups of Nile tilapia fed at different ration levels (3 & 4.5% bw/day). This study showed that the growth of all-male fish was significantly better than all-female fish for all three salinities and two rations. Salinities from 0 to 20‰ had no effect on growth performance of males or female fish. In the present study, it was evident that fish fed at 3% bw/day ration ate all the food offered and fish fed at 4.5% bw/day did not consumed all amounts. Also, growth performance did not significantly differ among fish fed at 3% bw/day ration level and reared at different salinities. Fish reared under higher salinities (20‰) and fed at higher ration (4.5% bw/day) level had skin lesions and injuries on their body. It was assumed that fish fed at higher ration under higher salinities (20‰) and maintained higher osmoregulatory costs together with osmotic stress may have a negative influence on the appetite of fish. Another possibility that may have affected the appetite could be the unionized ammonia levels that were high. The high-unionized ammonia levels combined with the osmotic stress may have been the cause, or have aided, development of skin lesions and injuries on the fish at higher salinities.
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Language: | English |
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2006
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Subjects: | Aquaculture, Biology, Nile tilapia, Oreochromis niloticus, salinity, food ration, growth rate, x-radiography, |
Online Access: | http://hdl.handle.net/1834/34192 |
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dig-aquadocs-1834-341922021-07-12T02:17:10Z Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.) Ali, M.A. Stead, S.M. Houlihan, D.F. Aquaculture Biology Nile tilapia Oreochromis niloticus salinity food ration growth rate x-radiography The effect of salinity (0, 10 & 20‰, water temperature 28 ± 1°C) and food ration (3 and 4.5% bw/day) on food consumption and growth of Nile tilapia, Oreochromis niloticus (10.77 ± 0.21g) were investigated. Individual food consumption was measured using X-radiography technique. Salinities (0, 10 & 20‰) did not have significant effect on the growth rate of groups of Nile tilapia fed at different ration levels (3 & 4.5% bw/day). This study showed that the growth of all-male fish was significantly better than all-female fish for all three salinities and two rations. Salinities from 0 to 20‰ had no effect on growth performance of males or female fish. In the present study, it was evident that fish fed at 3% bw/day ration ate all the food offered and fish fed at 4.5% bw/day did not consumed all amounts. Also, growth performance did not significantly differ among fish fed at 3% bw/day ration level and reared at different salinities. Fish reared under higher salinities (20‰) and fed at higher ration (4.5% bw/day) level had skin lesions and injuries on their body. It was assumed that fish fed at higher ration under higher salinities (20‰) and maintained higher osmoregulatory costs together with osmotic stress may have a negative influence on the appetite of fish. Another possibility that may have affected the appetite could be the unionized ammonia levels that were high. The high-unionized ammonia levels combined with the osmotic stress may have been the cause, or have aided, development of skin lesions and injuries on the fish at higher salinities. 2021-06-24T17:35:43Z 2021-06-24T17:35:43Z 2006 article 1026-6690 http://hdl.handle.net/1834/34192 en application/pdf application/pdf 111-120 http://aquaticcommons.org/id/eprint/18872 12051 2015-11-26 12:37:47 18872 Bangladesh Fisheries Research Institute |
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Aquaculture Biology Nile tilapia Oreochromis niloticus salinity food ration growth rate x-radiography Aquaculture Biology Nile tilapia Oreochromis niloticus salinity food ration growth rate x-radiography |
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Aquaculture Biology Nile tilapia Oreochromis niloticus salinity food ration growth rate x-radiography Aquaculture Biology Nile tilapia Oreochromis niloticus salinity food ration growth rate x-radiography Ali, M.A. Stead, S.M. Houlihan, D.F. Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.) |
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The effect of salinity (0, 10 & 20‰, water temperature 28 ± 1°C) and food ration (3 and 4.5% bw/day) on food consumption and growth of Nile tilapia, Oreochromis niloticus (10.77 ± 0.21g) were investigated. Individual food consumption was measured using X-radiography technique. Salinities (0, 10 & 20‰) did not have significant effect on the growth rate of groups of Nile tilapia fed at different ration levels (3 & 4.5% bw/day). This study showed that the growth of all-male fish was significantly better than all-female fish for all three salinities and two rations. Salinities from 0 to 20‰ had no effect on growth performance of males or female fish. In the present study, it was evident that fish fed at 3% bw/day ration ate all the food offered and fish fed at 4.5% bw/day did not consumed all amounts. Also, growth performance did not significantly differ among fish fed at 3% bw/day ration level and reared at different salinities. Fish reared under higher salinities (20‰) and fed at higher ration (4.5% bw/day) level had skin lesions and injuries on their body. It was assumed that fish fed at higher ration under higher salinities (20‰) and maintained higher osmoregulatory costs together with osmotic stress may have a negative influence on the appetite of fish. Another possibility that may have affected the appetite could be the unionized ammonia levels that were high. The high-unionized ammonia levels combined with the osmotic stress may have been the cause, or have aided, development of skin lesions and injuries on the fish at higher salinities. |
format |
article |
topic_facet |
Aquaculture Biology Nile tilapia Oreochromis niloticus salinity food ration growth rate x-radiography |
author |
Ali, M.A. Stead, S.M. Houlihan, D.F. |
author_facet |
Ali, M.A. Stead, S.M. Houlihan, D.F. |
author_sort |
Ali, M.A. |
title |
Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.) |
title_short |
Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.) |
title_full |
Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.) |
title_fullStr |
Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.) |
title_full_unstemmed |
Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis niloticus L.) |
title_sort |
effect of salinity and food ration level on the growth of nile tilapia (oreochromis niloticus l.) |
publishDate |
2006 |
url |
http://hdl.handle.net/1834/34192 |
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