If a fish can pass the mark test, what are the implications for consciousness and self-awareness

If a fish can pass the mark test, what are the implications for consciousness and self-awareness testing in animals? Masanori Kohda et al (2019), PLOS Biology The ability to perceive and recognise a reflected mirror image as self (mirror self-recognition, MSR) is considered a hallmark of cognition across species. Although MSR has been reported in mammals and birds, it is not known to occur in any other major taxon. Potentially limiting our ability to test for M