Fish market favourites such as orange roughy, common octopus and pink conch are among the species of fish and invertebrates in rapid decline around the world, say researchers. In the study, published in the journal Estuarine, Coastal and Shelf Science, the research team assessed the biomass--the weight of a given population in the water--of more than 1,300 fish and invertebrate populations. They discovered global declines, some severe, of many popularly consumed species.

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