Does growth and metabolism indicators can help the survey of redfish Sebastes mentella in the Estuary and Gulf of St. Lawrence - Archive ouverte HAL
Communication Dans Un Congrès Année : 2021

Does growth and metabolism indicators can help the survey of redfish Sebastes mentella in the Estuary and Gulf of St. Lawrence

Résumé

Redfish (Sebastes mentella) is expected to sustain most bottom commercial fisheries in the years to come in the Estuary and Gulf of St. Lawrence (EGSL). Between 2011 and 2013, three strong cohorts recruited to the stock and their abundance has increased exponentially. The main goal of this work was to deepen our knowledge of growth regulation in redfish at molecular level, and to determine how it may inform about spatial differences in stocks. Biometrics and gene expression (GE) were measured in wild redfish captured at 7 different sites in the EGSL. GE was analyzed by real-time PCR with Taqman probes. Growth of S. mentella is not uniform in the different areas of EGSL. The estuary seemed to be the least favorable area supporting growth of Sebastes mentella, in contrast to the Cabot strait where the largest individuals were captured. We did not find any evidence of dissolved oxygen, salinity or depth effects on average mass. Fish weight and temperature at the capture site explained 11% of the variation of gene expression. The relative expression of insulin-like growth factor-1 (igf-1) and lactate dehydrogenase (ldh) correlated positively with weight, whereas myosin (myo), citrate synthase (cs), and pyruvate kinase (pk) correlated negatively. The relative expression of cytochrome c oxidase (cox) and igf-1 receptor (igf-1r) presented a negative correlation with temperature. We found that igf-1, igf-1r, pk and cox were the best candidates as growth indicators in redfish. Transcriptomics was found to be a tool of interest to investigate growth in a deep-sea fish that is difficult to study in terms of physiology. Finally, since growth potential of Sebastes mentella is strongly correlated with temperature (being even enhanced by the temperature increase), this study suggests an ecological advantage for this species in a climate warming context.
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Dates et versions

hal-04678941 , version 1 (27-08-2024)

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  • HAL Id : hal-04678941 , version 1

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Martinez-Silva Maria, Vagner Marie, Senay Caroline, Audet Céline. Does growth and metabolism indicators can help the survey of redfish Sebastes mentella in the Estuary and Gulf of St. Lawrence. Society of Canadian Zoology, 2021, Virtual conference, Canada. ⟨hal-04678941⟩
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