ArticleMarine biotechnology (New York, N.Y.)2025
Integrative Assessment of Interrelated Swimming Performances and their Physiological Basis in Large Yellow Croaker (Larimichthys crocea).
Article in Marine biotechnology (New York, N.Y.), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Swimming performance is critical to the survival of fish, influencing behaviors such as foraging, predator avoidance, and habitat selection. However, most previous studies have focused on a single type of swimming performance, with limited attention to the integration and interrelation of different swimming performances within the same individual. In this study, we systematically evaluated the relationships among critical swimming speed (Ucrit), burst swimming speed (Uburst), and endurance time in the large yellow croaker (Larimichthys crocea), and investigated the physiological basis underlying individual variation in swimming performance. Using three distinct swimming test protocols, we comprehensively evaluated various types of swimming performance in the same fish. Our findings revealed that the distributions of Ucrit, Uburst, and endurance time approximated normality, with Ucrit displaying significant positive correlations with both Uburst and endurance duration. Histological observations revealed qualitative structural differences in red muscle between groups. Superior swimmers (SS) exhibited more orderly and compact red muscle myofibrils and better-preserved mitochondrial morphology, whereas inferior swimmers (IS) showed disrupted myofibrillar organization and mitochondrial damage. Moreover, these SS individuals exhibited significantly higher activities of key metabolic enzymes (phosphofructokinase, pyruvate kinase, lactate dehydrogenase, and citrate synthase) in white muscle tissue. Together, these results indicate that muscle structural characteristics and metabolic enzyme capacities contribute to individual variation in swimming performance. Our findings highlight that swimming performance is a complex integrative trait shaped by multiple interacting physiological factors, and provide a theoretical foundation for improving the health, welfare, and sustainability of offshore aquaculture practices for large yellow croaker.
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