Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements
Tesis doctoral presentada para optar al grado de Doctor por la Universidad de Stirling.--2019-12-09.--Apto Ballan wrasse (Labrus bergylta), successfully used as a biological delouser of Atlantic salmon (Salmo salar), are eco-friendlier alternative to the use of chemotherapeutants. However, the use o...
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Language: | Spanish |
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University of Stirling
2019
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Online Access: | http://hdl.handle.net/10261/255114 |
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ftcsic:oai:digital.csic.es:10261/255114 2024-02-11T10:02:13+01:00 Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements Cavrois-Rogacki, Thomas Monroig, Óscar 2019-12-09 http://hdl.handle.net/10261/255114 es spa University of Stirling CSIC - Instituto de Acuicultura de Torre de la Sal (IATS) http://hdl.handle.net/1893/31267 Sí http://hdl.handle.net/10261/255114 embargo_20230612 tesis doctoral http://purl.org/coar/resource_type/c_db06 2019 ftcsic 2024-01-16T11:16:00Z Tesis doctoral presentada para optar al grado de Doctor por la Universidad de Stirling.--2019-12-09.--Apto Ballan wrasse (Labrus bergylta), successfully used as a biological delouser of Atlantic salmon (Salmo salar), are eco-friendlier alternative to the use of chemotherapeutants. However, the use of wild caught specimens, which account for most of the deployed fish, is not sustainable. Therefore, the industry wishes to transition to farmed ballan wrasse, seen as a more sustainable, reliable and predictable source. However, the hatcheries are facing production challenges common to any new marine fish species including low survival, suboptimal growth, poor feed efficiency and lack of robustness that hampers the up-scaling of the production. To increase hatchery productivity, this doctoral project investigated the nutritional and environmental requirements of the species to develop commercial protocols. The first two experimental chapters focused on live feed (e.g. Artemia) enrichment for ballan wrasse larvae especially for phospholipids and essential fatty acids (chapter II) and selenium (chapter III). Chapter II proposes an effective, simple and easy method for simultaneously boosting the phospholipid and essential fatty acids content of the nauplii. In chapter III, an enrichment protocol was created allowing the hatcheries to target specific selenium contents in their nauplii. Then, research looked at the impact of three temperatures (10, 13 and 16 °C) on juveniles feed intake, growth and digestibility (chapter IV). Results showed that growth performance and feed efficiency were greatly improved at 16 °C which is implemented commercially could shorten the on-growing nursery phase by more than four months. Chapter V then studied the effects of dietary protein content (standard 51% vs. and high 59 % crude protein) and protein source (fish meal vs plant-based). Results showed fish fed the standard protein diets had a higher feed efficiency while signs of mild enteritis were observed in fish fed the high protein ... Doctoral or Postdoctoral Thesis Atlantic salmon Salmo salar Digital.CSIC (Spanish National Research Council) Ballan ENVELOPE(12.203,12.203,65.945,65.945) Stirling ENVELOPE(164.117,164.117,-71.550,-71.550) |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
Spanish |
description |
Tesis doctoral presentada para optar al grado de Doctor por la Universidad de Stirling.--2019-12-09.--Apto Ballan wrasse (Labrus bergylta), successfully used as a biological delouser of Atlantic salmon (Salmo salar), are eco-friendlier alternative to the use of chemotherapeutants. However, the use of wild caught specimens, which account for most of the deployed fish, is not sustainable. Therefore, the industry wishes to transition to farmed ballan wrasse, seen as a more sustainable, reliable and predictable source. However, the hatcheries are facing production challenges common to any new marine fish species including low survival, suboptimal growth, poor feed efficiency and lack of robustness that hampers the up-scaling of the production. To increase hatchery productivity, this doctoral project investigated the nutritional and environmental requirements of the species to develop commercial protocols. The first two experimental chapters focused on live feed (e.g. Artemia) enrichment for ballan wrasse larvae especially for phospholipids and essential fatty acids (chapter II) and selenium (chapter III). Chapter II proposes an effective, simple and easy method for simultaneously boosting the phospholipid and essential fatty acids content of the nauplii. In chapter III, an enrichment protocol was created allowing the hatcheries to target specific selenium contents in their nauplii. Then, research looked at the impact of three temperatures (10, 13 and 16 °C) on juveniles feed intake, growth and digestibility (chapter IV). Results showed that growth performance and feed efficiency were greatly improved at 16 °C which is implemented commercially could shorten the on-growing nursery phase by more than four months. Chapter V then studied the effects of dietary protein content (standard 51% vs. and high 59 % crude protein) and protein source (fish meal vs plant-based). Results showed fish fed the standard protein diets had a higher feed efficiency while signs of mild enteritis were observed in fish fed the high protein ... |
author2 |
Monroig, Óscar |
format |
Doctoral or Postdoctoral Thesis |
author |
Cavrois-Rogacki, Thomas |
spellingShingle |
Cavrois-Rogacki, Thomas Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements |
author_facet |
Cavrois-Rogacki, Thomas |
author_sort |
Cavrois-Rogacki, Thomas |
title |
Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements |
title_short |
Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements |
title_full |
Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements |
title_fullStr |
Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements |
title_full_unstemmed |
Optimisation of the hatchery production of Ballan wrasse (Labrus bergylta) with an emphasis on nutritional and environmental requirements |
title_sort |
optimisation of the hatchery production of ballan wrasse (labrus bergylta) with an emphasis on nutritional and environmental requirements |
publisher |
University of Stirling |
publishDate |
2019 |
url |
http://hdl.handle.net/10261/255114 |
long_lat |
ENVELOPE(12.203,12.203,65.945,65.945) ENVELOPE(164.117,164.117,-71.550,-71.550) |
geographic |
Ballan Stirling |
geographic_facet |
Ballan Stirling |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
http://hdl.handle.net/1893/31267 Sí http://hdl.handle.net/10261/255114 |
op_rights |
embargo_20230612 |
_version_ |
1790598139404615680 |