{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T21:22:40Z","timestamp":1778620960187,"version":"3.51.4"},"reference-count":90,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,8,3]],"date-time":"2021-08-03T00:00:00Z","timestamp":1627948800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National University Research Council, Romania","award":["PN-III-PTE-2016, ID 0188."],"award-info":[{"award-number":["PN-III-PTE-2016, ID 0188."]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>The study aimed to compare the growth performance and physiological responses of bester (B) and backcrossed bester \u2640 \u00d7 beluga \u2642 (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 \u00b1 21.21 g) and BB fingerlings (181.98 \u00b1 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 \u00b1 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 &lt; 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.<\/jats:p>","DOI":"10.3390\/ani11082292","type":"journal-article","created":{"date-parts":[[2021,8,4]],"date-time":"2021-08-04T02:16:07Z","timestamp":1628043367000},"page":"2292","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester \u2640 \u00d7 Beluga \u2642 Juveniles in Recirculating Aquaculture Systems"],"prefix":"10.3390","volume":"11","author":[{"given":"Lorena","family":"Dediu","sequence":"first","affiliation":[{"name":"Faculty of Food Science and Engineering, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"},{"name":"Romanian Center for Modelling Recirculating Aquaculture Systems, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Angelica","family":"Docan","sequence":"additional","affiliation":[{"name":"Faculty of Food Science and Engineering, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"},{"name":"Romanian Center for Modelling Recirculating Aquaculture Systems, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1269-4647","authenticated-orcid":false,"given":"Mirela","family":"Cre\u021bu","sequence":"additional","affiliation":[{"name":"Faculty of Food Science and Engineering, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"},{"name":"Romanian Center for Modelling Recirculating Aquaculture Systems, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Iulia","family":"Grecu","sequence":"additional","affiliation":[{"name":"Faculty of Food Science and Engineering, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"},{"name":"Romanian Center for Modelling Recirculating Aquaculture Systems, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alina","family":"Mogodan","sequence":"additional","affiliation":[{"name":"Faculty of Food Science and Engineering, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"},{"name":"Romanian Center for Modelling Recirculating Aquaculture Systems, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marilena","family":"Maereanu","sequence":"additional","affiliation":[{"name":"S.C. Danube Research-Consulting S.R.L., 825200 Isaccea, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5526-6621","authenticated-orcid":false,"given":"Lucian","family":"Oprea","sequence":"additional","affiliation":[{"name":"Romanian Center for Modelling Recirculating Aquaculture Systems, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"},{"name":"Cross-Border Faculty, \u201cDun\u0103rea de Jos\u201d University of Gala\u021bi, 800008 Gala\u021bi, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,8,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Gui, J.F., Tang, Q., Li, Z., Liu, J., and De Silva, S.S. (2018). Sturgeon Culture: Status and Practices. 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