Growth and Nutritional Quality of Black Rockfish Sebastes schlegelii at Two Stocking Densities in Marine Cage Culture
WANG Min1, YU Chaoyong2,3, LIU Ying2,3, WANG Yingjun2,3, SONG Aihuan2,3, ZHAO Wenxi2,3
1. College of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266237, China; 2. Shandong Academy of Marine Sciences, Qingdao 266104, China; 3. Shandong Key Laboratory of Intelligent Marine Ranch (Under Preparation), Qingdao 266104, China
Abstract：In order to investigate the effects of sea cage stocking density on the growth performance and muscle nutritional quality of black rockfish Sebastes schlegelii, and to screen the optimal aquaculture parameters, juvenile black rockfish with initial body weight of (23.08±4.89) g were cultured in net cages with a circumference of 40 m and a depth of 6 m at stocking densities of 17 000 fish per cage (low-density group) and 30 000 fish per cage (high-density group), at the national marine ranch in Shandong Rizhao Shenglong Aquaculture Co., Ltd, with conventional farming at water temperatures of 3—7 ℃ from early January to the end of March 2024. Growth performance, muscle proximate nutritional composition, amino acids, fatty acids, and mineral contents of the juveniles were systematically measured. The results showed that there were no significant differences in survival rate and growth indicators between two density groups (P＞0.05), suggesting that short-term high-density culture did not markedly inhibit growth. However, stocking density significantly affected nutritional quality (P＜0.05). There were significantly higher crude protein content and significantly lower crude lipid and ash contents in the low-density group than in the high-density group. Amino acid analysis revealed 17 common amino acids in both black rockfish groups, with the maximal glutamic acid concentration. The total amino acids, essential amino acids, and delicious amino acids were all found to be higher in the low-density group than in the high-density group, indicating a more significant nutritional advantage. There were significantly higher contents of n-3 polyunsaturated fatty acids and eicosapentaenoic acid and docosahexaenoic acid (EPA+DHA), and a higher n-3/n-6 ratio in the low-density group (P＜0.05), which more closely meet human healthy dietary requirements. Calcium, manganese and iron contents were significantly higher in the high-density group (P＜0.05), which was speculated to be related to metabolic changes induced by stress from high stocking density. In conclusion, high-density aquaculture results in decline of the muscle protein and functional fatty acid contents and thereby affects its nutritional value, though high-density aquaculture did not significantly impact the growth performance of black rockfish. Therefore, a lower stocking density (17 000 fish per cage) not only ensures good growth consistency and commercial size uniformity, but also significantly enhances muscle nutritional quality to better meet human healthy dietary needs. It is suggested that the balance between quality and economic benefits should be considered to select the stocking density scientifically in practice.
王敏, 于超勇, 刘莹, 王英俊, 宋爱环, 赵文溪. 两种海上网箱养殖密度下许氏平鲉生长和营养品质评价分析[J]. 水产科学, 2026, 45(5): 687-697.
WANG Min, YU Chaoyong, LIU Ying, WANG Yingjun, SONG Aihuan, ZHAO Wenxi. Growth and Nutritional Quality of Black Rockfish Sebastes schlegelii at Two Stocking Densities in Marine Cage Culture. Fisheries Science, 2026, 45(5): 687-697.
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