The notion is that people have failed to detect the massive changes which have happened in the ocean because they have been looking back only a relatively short time into the past.
And the crowd that throngs the wharf as the steamer draws alongside is gay and debonair; it is a noisy, cheerful, gesticulating crowd. It is a sea of brown faces.
The color on these is dubbed moonlit blue, which is definitely a little fancy pants, but I appreciate the aesthetic, and they definitely stand out in a sea of other wireless headphones.
Their methods do not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time.