Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects
Farmed ballan wrasse (Labrus bergylta) is recognised an efficient biological control of sea lice (Lepeophtheirus salmonis) infections in farmed Atlantic salmon (Salmo salar). Wild caught harvesting is putting increased pressure on wild stocks to meet growing demand, therefore, the production of dise...
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University of Stirling
2018
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Online Access: | http://hdl.handle.net/1893/29327 http://dspace.stir.ac.uk/bitstream/1893/29327/4/Research%20and%20development%20to%20optimise%20hatchery%20production%20of%20ballan%20wrasse_Chalaris%20A_PhD%20thesis.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/29327 2023-05-15T15:32:01+02:00 Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects Chalaris, Antonios Emm. Migaud, Herve Davie, Andrew Otter Ferry Seafish Ltd., University of Stirling and a co-funded project by Innovate UK 2018-07 application/pdf http://hdl.handle.net/1893/29327 http://dspace.stir.ac.uk/bitstream/1893/29327/4/Research%20and%20development%20to%20optimise%20hatchery%20production%20of%20ballan%20wrasse_Chalaris%20A_PhD%20thesis.pdf en eng University of Stirling http://hdl.handle.net/1893/29327 http://dspace.stir.ac.uk/bitstream/1893/29327/4/Research%20and%20development%20to%20optimise%20hatchery%20production%20of%20ballan%20wrasse_Chalaris%20A_PhD%20thesis.pdf 2024-01 5 years embargo would be the required time to write and publish articles from the thesis. 2024-02-01 Cleaner fish egg disinfection larviculture diets Bacillus bronopol digestive functions Ballan wrasse Fishes Breeding Lepeophtheirus salmonis Biological control Atlantic salmon Parasites Biological control Thesis or Dissertation Doctoral Doctor of Philosophy 2018 ftunivstirling 2022-06-13T18:45:22Z Farmed ballan wrasse (Labrus bergylta) is recognised an efficient biological control of sea lice (Lepeophtheirus salmonis) infections in farmed Atlantic salmon (Salmo salar). Wild caught harvesting is putting increased pressure on wild stocks to meet growing demand, therefore, the production of disease free, farmed populations is a priority. Two main bottlenecks to be addressed are low larvae survival rates and slow juvenile growth during the hatchery phase. A first study compared egg disinfection protocols using bronopol as an alternative to the commercial use of formalin. Bronopol concentration of 100ppm applied for 240min on the first day of egg incubation followed by daily treatment with 25ppm for 30min is recommended for disinfection to control bacterial growth without affecting egg survival and hatching. A follow up study investigated the need for bacterial control at early larvae stages. Results showed positive effects of synergetic use of probiotics and bronopol on survival rate and microbial analyses identified opportunistic bacteria in the rearing environment and fish. The work then compared commercially available diets developed for weaning and on growing of other marine fish species. Benchmarking experiments confirmed the importance of developing ballan wrasse tailored diets based on specific raw materials, and provided a stepping stone to rationalise growth potential, feed intake, digestive and liver function, against which to compare in future studies. Clear differences in survival and growth were observed during weaning with improved survival in larvae weaned onto a diet including shrimp and cod fillet meal. During on-growing, results indicated improved FCR and growth compared to previous studies, potentially reducing time required to reach deployment size from 20–24 month to 16–19 month period. Overall, this study provides new knowledge that can be directly applied to help tackle major bottlenecks in commercial exploitation of farmed ballan wrasse. Doctoral or Postdoctoral Thesis Atlantic salmon Salmo salar University of Stirling: Stirling Digital Research Repository Ballan ENVELOPE(12.203,12.203,65.945,65.945) |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
topic |
Cleaner fish egg disinfection larviculture diets Bacillus bronopol digestive functions Ballan wrasse Fishes Breeding Lepeophtheirus salmonis Biological control Atlantic salmon Parasites Biological control |
spellingShingle |
Cleaner fish egg disinfection larviculture diets Bacillus bronopol digestive functions Ballan wrasse Fishes Breeding Lepeophtheirus salmonis Biological control Atlantic salmon Parasites Biological control Chalaris, Antonios Emm. Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects |
topic_facet |
Cleaner fish egg disinfection larviculture diets Bacillus bronopol digestive functions Ballan wrasse Fishes Breeding Lepeophtheirus salmonis Biological control Atlantic salmon Parasites Biological control |
description |
Farmed ballan wrasse (Labrus bergylta) is recognised an efficient biological control of sea lice (Lepeophtheirus salmonis) infections in farmed Atlantic salmon (Salmo salar). Wild caught harvesting is putting increased pressure on wild stocks to meet growing demand, therefore, the production of disease free, farmed populations is a priority. Two main bottlenecks to be addressed are low larvae survival rates and slow juvenile growth during the hatchery phase. A first study compared egg disinfection protocols using bronopol as an alternative to the commercial use of formalin. Bronopol concentration of 100ppm applied for 240min on the first day of egg incubation followed by daily treatment with 25ppm for 30min is recommended for disinfection to control bacterial growth without affecting egg survival and hatching. A follow up study investigated the need for bacterial control at early larvae stages. Results showed positive effects of synergetic use of probiotics and bronopol on survival rate and microbial analyses identified opportunistic bacteria in the rearing environment and fish. The work then compared commercially available diets developed for weaning and on growing of other marine fish species. Benchmarking experiments confirmed the importance of developing ballan wrasse tailored diets based on specific raw materials, and provided a stepping stone to rationalise growth potential, feed intake, digestive and liver function, against which to compare in future studies. Clear differences in survival and growth were observed during weaning with improved survival in larvae weaned onto a diet including shrimp and cod fillet meal. During on-growing, results indicated improved FCR and growth compared to previous studies, potentially reducing time required to reach deployment size from 20–24 month to 16–19 month period. Overall, this study provides new knowledge that can be directly applied to help tackle major bottlenecks in commercial exploitation of farmed ballan wrasse. |
author2 |
Migaud, Herve Davie, Andrew Otter Ferry Seafish Ltd., University of Stirling and a co-funded project by Innovate UK |
format |
Doctoral or Postdoctoral Thesis |
author |
Chalaris, Antonios Emm. |
author_facet |
Chalaris, Antonios Emm. |
author_sort |
Chalaris, Antonios Emm. |
title |
Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects |
title_short |
Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects |
title_full |
Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects |
title_fullStr |
Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects |
title_full_unstemmed |
Research and development to optimise hatchery production of ballan wrasse (Labrus bergylta): bacterial control and nutritional aspects |
title_sort |
research and development to optimise hatchery production of ballan wrasse (labrus bergylta): bacterial control and nutritional aspects |
publisher |
University of Stirling |
publishDate |
2018 |
url |
http://hdl.handle.net/1893/29327 http://dspace.stir.ac.uk/bitstream/1893/29327/4/Research%20and%20development%20to%20optimise%20hatchery%20production%20of%20ballan%20wrasse_Chalaris%20A_PhD%20thesis.pdf |
long_lat |
ENVELOPE(12.203,12.203,65.945,65.945) |
geographic |
Ballan |
geographic_facet |
Ballan |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
http://hdl.handle.net/1893/29327 http://dspace.stir.ac.uk/bitstream/1893/29327/4/Research%20and%20development%20to%20optimise%20hatchery%20production%20of%20ballan%20wrasse_Chalaris%20A_PhD%20thesis.pdf |
op_rights |
2024-01 5 years embargo would be the required time to write and publish articles from the thesis. 2024-02-01 |
_version_ |
1766362517473329152 |