Effects of Stocking Density on Stress, Hematological Responses, and Growth of Black Rockfish Sebastes schlegelii
- Authors
- Lee, Jang-Won; Min, Byung Hwa; Lee, Bokyung; Kim, Kiyoung; Yoon, Minjung
- Issue Date
- Jun-2022
- Publisher
- American Fisheries Society
- Citation
- Journal of Aquatic Animal Health, v.34, no.2, pp 82 - 91
- Pages
- 10
- Journal Title
- Journal of Aquatic Animal Health
- Volume
- 34
- Number
- 2
- Start Page
- 82
- End Page
- 91
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/21153
- DOI
- 10.1002/aah.10151
- ISSN
- 0899-7659
1548-8667
- Abstract
- The objective of the current study was to evaluate the effect of stocking density on juvenile Black Rockfish Sebastes schlegelii (average weight = 12 g) in terms of stress, hematological responses, and growth performance during a 4-month growth trial in a flow-through system. The initial stocking densities were 1.3 kg/m(3) (low), 1.8 kg/m(3) (medium), and 2.3 kg/m(3) (high), and the final densities were 4.9 kg/m(3) (low), 5.6 kg/m(3) (medium), and 6.3 kg/m(3) (high). At the end of the trial, the high stocking density significantly affected growth characteristics, levels of growth hormone and insulin-like growth factor 1, and hematological indices (hematocrit, red blood cell count, and hemoglobin level) compared to the medium and low stocking densities. The plasma cortisol and immunoglobulin-M levels were significantly higher at the high density than at the other two densities. Taken together, while the low and medium stocking densities (final densities of up to 5.6 kg/m(3)) did not affect stress and hematological indices or growth, the high stocking density (final density of 6.3 kg/m(3)) significantly impacted those variables, which suggests an allostatic load at that density. Thus, the use of a final stocking density less than 6.3 kg/m(3) should be considered to avoid compromising the stress and health condition and growth of Black Rockfish at this size and temperature range.
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