Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems
The study aimed to compare the growth performance and physiological responses of bester (B) and backcrossed bester ♀ × beluga ♂ (BB) in response to crowding stress under different stocking densities, as well as to establish a threshold stocking density for rearing BB in a recirculating aquaculture s...
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ftmdpi:oai:mdpi.com:/2076-2615/11/8/2292/ 2023-08-20T04:05:34+02:00 Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems Lorena Dediu Angelica Docan Mirela Crețu Iulia Grecu Alina Mogodan Marilena Maereanu Lucian Oprea agris 2021-08-03 application/pdf https://doi.org/10.3390/ani11082292 EN eng Multidisciplinary Digital Publishing Institute Aquatic Animals https://dx.doi.org/10.3390/ani11082292 https://creativecommons.org/licenses/by/4.0/ Animals; Volume 11; Issue 8; Pages: 2292 stocking density hybrid sturgeons overcrowding stress physiological response RAS serum parameters Text 2021 ftmdpi https://doi.org/10.3390/ani11082292 2023-08-01T02:21:17Z The study aimed to compare the growth performance and physiological responses of bester (B) and backcrossed bester ♀ × beluga ♂ (BB) in response to crowding stress under different stocking densities, as well as to establish a threshold stocking density for rearing BB in a recirculating aquaculture system (RAS) without welfare impairment. For this purpose, in the first trial (T1), B (181.15 ± 21.21 g) and BB fingerlings (181.98 ± 28.65 g) were reared in two stocking densities of 2 kg/m2 and 4 kg/m2 in fiberglass tanks (1 m3) for 6 weeks. In a parallel trial (T2), the BB hybrids (335.24 ± 39.30 g) were kept in four initial stocking densities, ranging from 5 kg/m2 to 12 kg/m2. The results of T1 revealed better growth indices (i.e., final mean weight, weight gain, specific growth rate) at lower stocking densities for both hybrids; however, in terms of growth performance, the BB hybrid showed better results when compared with the B hybrid. BB hybrids registered significantly (p < 0.05) lower serum cortisol and MDA and higher lysozyme than B hybrids, showing higher tolerance to crowding stress. Nevertheless, at higher densities, selected serum parameters (i.e., hematological indices, cortisol, glucose, protein, malondialdehyde, lysozyme) and growth performance indices used to evaluate the hybrids indicate that high stocking density could affect the growth and welfare of BB hybrids, and that the selected serum parameters could be used as good indicators for chronic stress caused by overcrowding conditions. Text Beluga Beluga* MDPI Open Access Publishing Animals 11 8 2292 |
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MDPI Open Access Publishing |
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language |
English |
topic |
stocking density hybrid sturgeons overcrowding stress physiological response RAS serum parameters |
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stocking density hybrid sturgeons overcrowding stress physiological response RAS serum parameters Lorena Dediu Angelica Docan Mirela Crețu Iulia Grecu Alina Mogodan Marilena Maereanu Lucian Oprea Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems |
topic_facet |
stocking density hybrid sturgeons overcrowding stress physiological response RAS serum parameters |
description |
The study aimed to compare the growth performance and physiological responses of bester (B) and backcrossed bester ♀ × beluga ♂ (BB) in response to crowding stress under different stocking densities, as well as to establish a threshold stocking density for rearing BB in a recirculating aquaculture system (RAS) without welfare impairment. For this purpose, in the first trial (T1), B (181.15 ± 21.21 g) and BB fingerlings (181.98 ± 28.65 g) were reared in two stocking densities of 2 kg/m2 and 4 kg/m2 in fiberglass tanks (1 m3) for 6 weeks. In a parallel trial (T2), the BB hybrids (335.24 ± 39.30 g) were kept in four initial stocking densities, ranging from 5 kg/m2 to 12 kg/m2. The results of T1 revealed better growth indices (i.e., final mean weight, weight gain, specific growth rate) at lower stocking densities for both hybrids; however, in terms of growth performance, the BB hybrid showed better results when compared with the B hybrid. BB hybrids registered significantly (p < 0.05) lower serum cortisol and MDA and higher lysozyme than B hybrids, showing higher tolerance to crowding stress. Nevertheless, at higher densities, selected serum parameters (i.e., hematological indices, cortisol, glucose, protein, malondialdehyde, lysozyme) and growth performance indices used to evaluate the hybrids indicate that high stocking density could affect the growth and welfare of BB hybrids, and that the selected serum parameters could be used as good indicators for chronic stress caused by overcrowding conditions. |
format |
Text |
author |
Lorena Dediu Angelica Docan Mirela Crețu Iulia Grecu Alina Mogodan Marilena Maereanu Lucian Oprea |
author_facet |
Lorena Dediu Angelica Docan Mirela Crețu Iulia Grecu Alina Mogodan Marilena Maereanu Lucian Oprea |
author_sort |
Lorena Dediu |
title |
Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems |
title_short |
Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems |
title_full |
Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems |
title_fullStr |
Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems |
title_full_unstemmed |
Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems |
title_sort |
effects of stocking density on growth performance and stress responses of bester and bester ♀ × beluga ♂ juveniles in recirculating aquaculture systems |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/ani11082292 |
op_coverage |
agris |
genre |
Beluga Beluga* |
genre_facet |
Beluga Beluga* |
op_source |
Animals; Volume 11; Issue 8; Pages: 2292 |
op_relation |
Aquatic Animals https://dx.doi.org/10.3390/ani11082292 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/ani11082292 |
container_title |
Animals |
container_volume |
11 |
container_issue |
8 |
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2292 |
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1774716117705555968 |