2020-07-24, 9:21 AMPopular seafood species sharply decline around the world - Times of India

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Popular seafood species sharply decline around the worldBy - IANS Created: Jul 23, 2020, 20:38 IST

Fish market favourites such as orange roughy, common octopus andpink conch are among the species of fish and invertebrates in rapid

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2020-07-24, 9:21 AMPopular seafood species sharply decline around the world - Times of India

Page 2 of 14https://timesofindia.indiatimes.com/life-style/food-news/popular-seafood-species-sharply-decline-around-the-world/articleshow/77132343.cms

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decline around the world, say researchers.

In the study, published in the journal Estuarine, Coastal and ShelfScience, the research team assessed the biomass--the weight of agiven population in the water--of more than 1,300 fish andinvertebrate populations. They discovered global declines, somesevere, of many popularly consumed species.

"This is the first-ever global study of long-term trends in thepopulation biomass of exploited marine fish and invertebrates for allcoastal areas on the planet," said study lead author Maria Palomaresfrom the University of British Columbia in Canada.

"When we looked at how the populations of major species have beendoing in the past 60 years, we discovered that, at present, most oftheir biomasses are well below the level that can produce optimalcatches," Palomares added.

To reach their findings, the researchers applied computer-intensivestock assessment methods known as CMSY and BSMY to thecomprehensive catch data by marine ecosystem reconstructed by the'Sea Around U's for the 1950-2014 period.The greatest declines instocks were found in the southern temperate and polar Indian Oceanand the southern polar Atlantic Ocean, where populations shrunk bywell over 50 per cent since 1950.

While much of the globe showed declining trends in fish andinvertebrates, the analysis found a few exceptions. Of thepopulations analysed, 82 per cent were found to be below levels thatcan produce maximum sustainable yields, due to being caught atrates exceeding what can be regrown.

Of these, 87 populations were found to be in the "very bad" category,with biomass levels at less than 20 per cent of what is needed tomaximize sustainable fishery catches. This also means that fishers are

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2020-07-24, 9:21 AMPopular seafood species sharply decline around the world - Times of India

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catching less and less fish and invertebrates over time, even if theyfish longer and harder.While much of the globe showed decliningtrends in fish and invertebrates, the analysis found a few exceptions.

"One of these was the Northern Pacific Ocean where populationbiomass increased by 800 per cent in its polar and subpolar zones,and by about 150 per cent in its temperate zone," the study authorsnoted.

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