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Longard, A. A. & Regier, L. W. Color and some composition changes in ocean perch ( Sebastes marinus) held in refrigerated seawater with and without carbon dioxide. J. Fish. Res. Board Can. 31, 456–460 (1974). There was no effect of treatment on the colour of raw fillets (L*: p = 0.478; a* p = 0.823; b*: p = 0.106). The RSW fish were slightly lighter and less yellowish in colour than iced. A common problem associated with RSW stored fish is the bleaching of fillets which may hinder its market value 10. Bleaching was not seen in the fillets, as adjacent to the findings of Erikson et al. 12 who found that continuous storage of fish in RSW did not lead to lighter fillets. By visual observation, gill colour from the RSW fish seemed to be grayer and less reddish in colour which could be a more obvious evidence of bleaching, as also reported in RSW-stored cod for 4 days 29 and RSW-stored ocean pearch for several days 30. This was further verified by the present study when the lightness observed on day 7 for the RSW fish was significatly higher ( p = 0.001; ice: 36.2 ± 3.2; RSW: 41.1 ± 3.4; control: 39.4 ± 3.2), while redness lower ( p = 0.001; ice: 18.1 ± 3.2; RSW: 13.2 ± 2.5; control: 16.0 ± 4.4) than both the iced and control fish. Nevertheless, quality of fillets from RSW stored fish are still considered highly acceptable with its shelf life surpassing traditionally iced fish 31. Espe, M. et al. Interactions between ice storage time, collagen composition, gaping and textural properties in farmed salmon muscle harvested at different times of the year. Aquaculture 240, 489–504. https://doi.org/10.1016/j.aquaculture.2004.04.023 (2004). Maldini, M., Nonnis Marzano, F., Fortes, G. G., Papa, R., & Gandolfi, G. (2006). Fish and seafood traceability based on AFLP markers: Elaboration of a species database. Aquaculture, 261, 487–494. Hultmann, L. & Rustad, T. Textural changes during iced storage of salmon ( Salmo salar) and cod ( Gadus morhua). J. Aquat. Food Prod. Technol. 11, 105–123. https://doi.org/10.1300/J030v11n03_09 (2002).

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